Washington State Route 520
Map of Seattle and the Eastside, with SR 520 highlighted in red
|Auxiliary route of I‑5|
|Defined by RCW|
|Maintained by WSDOT|
|Length:||12.82 mi (20.63 km)|
|Existed:||1964 – present|
|West end:||I‑5 in Seattle|
|I‑405 in Bellevue|
|East end:||SR 202 in Redmond|
State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km) from Seattle in the west to Redmond in the east. SR 520, a major regional freeway, connects Seattle to the Eastside region of King County over the Evergreen Point Floating Bridge on Lake Washington. SR 520 intersects several state highways, including Interstate 5 (I-5) in Seattle, Interstate 405 (I-405) in Bellevue, and SR 202 in Redmond.
The original Evergreen Point Floating Bridge was opened in 1963 as a replacement for the cross-lake ferry system that had operated since the turn of the century. SR 520 was designated in 1964 as a freeway connecting I-5 to I-405, while an extension to Redmond was proposed later in the decade. In the 1970s and 1980s, sections of the freeway between Bellevue and Redmond were opened to traffic, replacing the temporary designation of State Route 920 (SR 920).
Since the 1990s, SR 520 has been expanded with high-occupancy vehicle lanes (HOV lanes) and new interchanges to serve the Overlake area. The original Evergreen Point Floating Bridge was replaced in 2016 by a wider bridge, as part of a multibillion-dollar expansion program that is scheduled to be completed in the 2020s. The program also includes the construction of new bus infrastructure at Montlake and on the Eastside, as well as a bicycle and pedestrian path along most of the highway's length.
SR 520 begins at an interchange with Interstate 5 (I-5) in northern Seattle near Roanoke Park. The interchange provides access to both directions of I-5 as well as a westbound offramp to Harvard Avenue and Roanoke Street. SR 520 travels east across the south end of Portage Bay and its wetlands on the Portage Bay Viaduct, entering the Montlake neighborhood. In Montlake, the highway intersects Montlake Boulevard (SR 513) and Lake Washington Boulevard just south of the University of Washington campus and Husky Stadium. The freeway continues east on a causeway through the marshlands of Union Bay and Foster Island, at the north end of the Washington Park Arboretum. It passes through a second interchange with Lake Washington Boulevard, which includes several "ghost ramps" that were planned for the cancelled R.H. Thomson Expressway.
From Seattle, SR 520 crosses Lake Washington on the tolled Evergreen Point Floating Bridge; at 7,710 feet (2,350 m), it is the longest floating bridge in the world. Tolls are collected electronically using the state's Good to Go pass or by mail, and vary based on time of day and number of axles; the minimum Good to Go toll, as of 2017[update], is $1.25 between midnight and 5 a.m., and the maximum is $4.30 during the morning and evening peak periods. The freeway reaches the eastern end of Lake Washington at Evergreen Point in northern Medina, where it travels under a lidded park and next to a median-side bus station. After an interchange and lid at 84th Avenue Northeast in Hunts Point, SR 520 travels eastward around the northern edge of Clyde Hill in a north-facing arc, passing through the Yarrow Point lid and bus station. The freeway enters Bellevue, intersecting I-405 and crossing over the Eastside Rail Corridor. SR 520 continues along the north side of the Bel-Red industrial area and enters the Overlake area of Redmond.
Within Overlake, SR 520 turns north and passes through several office parks, including the headquarters campus of Microsoft and the Nintendo of America branch office. To serve exits at Northeast 40th Street and Northeast 51st Street, SR 520 gains a set of collector–distributor lanes, separated from other lanes by a concrete barrier. The freeway crosses the Sammamish River and turns east, passing to the south of the Redmond Town Center mall and Bear Creek and to the north of Marymoor Park. East of downtown Redmond, SR 520 intersects SR 202 and terminates; the road continues north as Avondale Road towards Cottage Lake. Portions of the corridor from Evergreen Point to Downtown Redmond are also paralleled by a shared-use trail for bicycles and pedestrians.
The entire route of SR 520 is designated as part of the National Highway System, classifying it as important to the national economy, defense, and mobility. The State of Washington also designates the SR 520 corridor as a Highway of Statewide Significance, which includes highways that connect major communities throughout the state. SR 520 is maintained by the Washington State Department of Transportation (WSDOT), which conducts an annual survey on the state's highways to measure traffic volume in terms of average annual daily traffic. In 2016, WSDOT calculated that 80,000 vehicles used SR 520 near its interchange with SR 202 in Redmond and 47,000 vehicles used it at SR 513 in Seattle, the highest and lowest traffic counts along the highway, respectively. The highway is noted for its lack of a "reverse commute", with roughly equal amounts of traffic in both directions during peak periods.:8
Ferries and proposed floating bridge
Settlements along the eastern shore of Lake Washington were established in the late 19th century by homesteaders, real estate developers, and industrialists. A ferry system was set up between towns on the lake and Seattle to the west in the 1880s. By 1913, the steam ferry Leschi was transporting automobiles, in addition to pedestrian traffic, between Seattle and docks in Bellevue, Kirkland, and Medina. In 1940, the Lake Washington Floating Bridge was opened between Seattle and Mercer Island, carrying the Sunset Highway (later I-90) from Seattle towards Bellevue and the Eastside. The new bridge allowed for the Eastside to rapidly develop into bedroom communities in the 1940s and 1950s; the bridge also replaced the ferry system, which ceased operation in 1950, shortly after the removal of tolls on the bridge.
In the late 1940s, the state government conducted a feasibility study for a second floating bridge across Lake Washington, in response to increased traffic on the bridge. In 1953, the Washington State Legislature approved the construction of a second floating bridge, using past and future tolls to fund its construction.:7 The west end of the floating bridge would be connected to the Everett–Seattle tollway (later Interstate 5) at Roanoke Street, south of the planned Ship Canal Bridge, as well as the proposed Empire Way Expressway at Montlake. The east end would be connected to a north–south freeway bypass of the Seattle area, which later became Interstate 405. Two alignments for the floating bridge were considered in the late 1950s: a Sand Point–Kirkland, favored by the City of Seattle; and an Evergreen Point crossing, favored by the state government and the U.S. Navy, which operated Naval Air Station Sand Point. The state government initially chose the Montlake–Evergreen Point alignment in 1954, intending to begin construction in 1955, but the alignment dispute delayed a final decision until December 1956. Citizen groups from the Montlake area protested the decision, but were largely ignored by the project's citizen committee.
Opening of floating bridge and freeway
Construction of the Evergreen Point Floating Bridge began on August 29, 1960, with pontoon assembly beginning the following year. The bridge and its approach highways, connecting the main branch of Primary State Highway 1 in Seattle to its Eastside branch near Bellevue, were added to the state highway system in March 1961. The western approach, an expressway between the Roanoke Interchange, Portage Bay, Montlake, and the Washington Park Arboretum, began construction in early 1962. The eastern approach was constructed between 1962 and 1963, connecting Medina, Secondary State Highway 2A in southern Houghton, and Northup Way, which continued east towards Redmond.
The Evergreen Point Floating Bridge opened on August 28, 1963, along with the Roanoke Expressway, part of the Seattle Freeway, and the eastern approach to Houghton and Bellevue at a temporary interchange with 104th Avenue Northeast. The bridge and its approaches, constituting a state highway, were re-designated as State Route 520 under the new state highway numbering system adopted in 1964. SR 520 would use a temporary route on local roads between Bellevue and SR 202 in Redmond until the planned freeway was completed by the late 1970s.
Extension to Redmond
The Northup Interchange, where SR 520 intersects I-405, was opened on November 22, 1966. The highway was also extended east from 104th Avenue Northeast to 124th Avenue Northeast, serving the Bel-Red industrial area. The state government announced plans in 1968 to begin construction on the remaining freeway to Redmond, via a northeastward course through the Overlake area and across Marymoor Park. Construction of a 1.3-mile-long (2.1 km) segment between 124th Avenue Northeast and 148th Avenue Northeast in Overlake began in February 1972 and was completed in December 1973.
The planned route of SR 520 along the north side Marymoor Park in Redmond was given the temporary designation of SR 920 in 1975. The two-lane expressway, connecting West Lake Sammamish Parkway (SR 901) and SR 202, was opened in July 1977 after several months of construction. Completion of the "missing link" on SR 520, between 148th Avenue Northeast and SR 920, was given prioritization by Eastside cities and civic groups in the mid-1970s. The City of Bellevue, however, requested that the state government build a reversible bus lane on the Evergreen Point Floating Bridge before completing the "missing link", due to increased traffic on the bridge. The City of Redmond opposed the request, leading to a dispute between the two cities that was later resolved with a compromise to place completion of SR 520 ahead of the bus lane.
The state government approved funding for the Redmond project in 1977, using part of a statewide gasoline tax increase, and estimated the cost at $10 million (equivalent to $61 million in 2016 dollars). Contract bidding for the "missing link" project was halted by a lawsuit filed by Eastside residents in opposition to the freeway in 1978, claiming that its environmental impact had been improperly assessed. U.S. District judge Morell Edward Sharp ruled in favor of the state government in March 1979, allowing for the bid to be awarded to a contractor. The 2.3-mile (3.7 km) segment was completed in December 1981. The SR 920 designation was removed from the state highway system in 1985, and re-signed as part of SR 520. A traffic signal at the intersection of SR 520 and Northeast 51st Street remained in place until 1986, when it was replaced with an interchange.
Freeway widening and new interchanges
The completion of SR 520 spurred new development in Downtown Redmond and the Overlake area, contributing to major traffic congestion on the freeway. In 1994, the state government approved $81.1 million (equivalent to $168 million in 2016 dollars) in highway improvements for the SR 520 corridor, including lane expansions and the addition of high-occupancy vehicle lanes. The segment from West Lake Sammamish Parkway to SR 202 was widened from two to four lanes in September 1995, including the construction of a new bridge across the Sammamish River. The highway's terminus at SR 202 was converted from a signalized intersection to an interchange, including an overpass connecting to Avondale Road, in late 1996. SR 520's HOV lanes between I-405 and West Lake Sammamish Parkway were opened between 1996 and 1997; the segment from I-405 to the Evergreen Point Floating Bridge already had a HOV lane installed in the 1980s. A new interchange was built at Northeast 40th Street in 2000 to serve the Microsoft Redmond Campus and other nearby employers, along with a set of collector–distributor lanes through the area and ramp meters to manage traffic flow.
In the late 2000s, WSDOT completed several highway improvement projects on the segment of SR 520 between West Lake Sammamish Parkway and SR 202 in Downtown Redmond. In August 2008, a flyover ramp from westbound SR 202 to westbound SR 520 was opened to traffic, replacing a pair of onramp traffic signals. SR 520 was widened to four lanes in each direction in 2010, in a multi-phase project that added HOV lanes and merge lanes, as well as reconstructed ramps at West Lake Sammamish Parkway. In addition to the Downtown Redmond projects, a new lid-like overpass at Northeast 36th Street in Overlake was opened in 2010 to improve traffic in the area. The overpass's $30 million cost (equivalent to $36 million in 2016 dollars) was funded mostly by Microsoft, along with contributions from the City of Redmond and federal stimulus funding.
Bridge replacement and corridor improvements
Since the opening of the Evergreen Point Floating Bridge in 1963, several proposals from local governments have requested the construction of a parallel span or additional pontoons to increase capacity and add infrastructure for rapid transit and bicyclists. Daily traffic crossing the bridge rose from 17,400 cars in 1964 to nearly 100,000 in 1987, making the bridge the worst traffic bottleneck in the state of Washington. By the late 1990s, the bridge was carrying twice as much traffic as it was designed to handle, and calls from Eastside cities and companies for a replacement bridge intensified. WSDOT engineers also determined that sections of the bridge would fail during a large earthquake or a major windstorm, and that the bridge was nearing the end of its life expectancy, necessitating a total replacement. The bridge underwent a major rehabilitation in 1999, including a seismic retrofit and increased resistance to stronger sustained winds, to extend the life expectancy to 20 to 25 years.:4
The Washington State Transportation Commission began seeking alternatives for the bridge replacement project in 1997, including a Sand Point crossing and various designs for a parallel replacement span. The alternatives were narrowed to a replacement span, with varying lane widths and configurations for interchanges in Seattle, in 2003. The project's preferred alternative, a replacement span with six lanes and a mixed-use trail, was chosen by WSDOT in 2011. The $4.56 billion megaproject, which encompasses the SR 520 corridor between I-5 and I-405, was funded using a state gas tax and electronic tolls on the floating bridge introduced on December 29, 2011, to repay construction bonds over a 40-year period.
Construction of the SR 520 corridor project began on the Eastside in April 2011, where WSDOT would expand the freeway to six lanes and add HOV lanes. The project, completed in 2014, also included the construction of new bus stations and direct access ramps, new interchanges, park lids covering SR 520, and a multi-use trail. The new floating bridge began construction in 2012 and was opened in April 2016, becoming the longest floating bridge in the world. The new, 115-foot-wide (35 m) bridge features four general purpose lanes and two HOV lanes, as well as a multi-use trail on its north side. Demolition of the former bridge was completed in early 2017. The western approach was partially replaced with a new bridge for westbound traffic in August 2017; completion of the bridge's multi-use pedestrian and bicycle trail is anticipated in November 2017.
The remaining parts of the SR 520 corridor program, between I-5 and the floating bridge, were initially left unfunded but underwent design and environmental review. In 2015, the state legislature approved $1.64 billion in funding for the "Rest of the West" program, which will be constructed between 2018 and 2029. The first phase of the program, planned to be completed by 2023, will include construction of the eastbound lanes of the western approach bridge and a new Montlake Boulevard interchange with HOV lane ramps, a relocated bus station, and a park lid. The second phase, to be constructed between 2020 and 2026, will include a new bridge across Portage Bay, a park lid near Roanoke Park, and a new HOV lane ramp to the I-5 reversible express lanes. The third phase, to be constructed between 2024 and 2029, will consist of a second bascule bridge over the Montlake Cut, paralleling the existing Montlake Bridge, to connect SR 520 to the University District.
The SR 520 corridor is served by Sound Transit Express route 545, as well as other Sound Transit Express, King County Metro, and Community Transit bus routes. The corridor averaged about 8,000 weekday riders in 2009, using 600 bus trips. During peak periods, buses travel on SR 520 every one to four minutes between the Evergreen Point Floating Bridge and I-405.
Sound Transit will begin Link light rail service along the Redmond portion of the SR 520 corridor in 2023, with the opening of the East Link Extension. Approved by voters in 2008, the line will connect Overlake Transit Center at Northeast 40th Street and Overlake Village station at 152nd Avenue Northeast to Seattle and Downtown Bellevue, crossing Lake Washington on the I-90 floating bridge. In 2024, the line will be extended along SR 520 to Downtown Redmond, as part of Sound Transit 3. The rebuilt floating bridge was also designed to accommodate a future light rail extension, requiring supplemental pontoons and new approaches.
The entire highway is in King County. All exits are unnumbered.
|Seattle||0.00||0.00||I‑5 – Portland, Vancouver BC||I-5 exit 168B; western terminus.|
|0.20||0.32||Roanoke Street / Harvard Avenue||Westbound exit only|
|0.94||1.51||Montlake Boulevard (SR 513) – University of Washington||Last eastbound exit before toll|
|1.63||2.62||Lake Washington Boulevard||Eastbound entrance only|
|SR 520 Albert D. Rosellini Evergreen Point Floating Bridge|
|Medina||4.14||6.66||Evergreen Point Freeway Station||Bus only|
|Hunts Point||4.57||7.35||84th Avenue Northeast||Eastbound exit and westbound entrance|
|Clyde Hill||5.39||8.67||92nd Avenue Northeast||Westbound exit and eastbound entrance. Last westbound exit before toll.|
|5.15||8.29||Yarrow Point Freeway Station||Bus only|
|Bellevue||5.97||9.61||Lake Washington Boulevard Northeast / Bellevue Way||Eastbound exit and westbound entrance; former SR 908|
|6.29||10.12||108th Avenue Northeast||No eastbound exit (except HOV)|
|6.94||11.17||I‑405 – Renton, Everett||I-405 exit 14.|
|7.50||12.07||124th Avenue Northeast||Eastbound exit and westbound entrance|
|9.17||14.76||148th Avenue Northeast|
|Northeast 40th Street / Northeast 51st Street|
|11.79||18.97||West Lake Sammamish Parkway Northeast||Former SR 901|
|12.82||20.63||SR 202 (Redmond Way)||Eastbound exit and westbound entrance; continues as Avondale Road|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- "47.17.720: State route No. 520". Revised Code of Washington. Washington State Legislature. 1970. Retrieved July 17, 2017.
- Multimodal Planning Division (January 27, 2017). State Highway Log Planning Report 2016, SR 2 to SR 971 (PDF) (Report). Washington State Department of Transportation. pp. 1525–1532. Retrieved August 29, 2017.
- "SR 5 – Exit 168A/B: SR 520/Roanoke St/Boylston Ave" (PDF). Washington State Department of Transportation. March 14, 2017. Retrieved July 17, 2017.
- Google (July 17, 2017). "State Route 520" (Map). Google Maps. Google. Retrieved July 17, 2017.
- "SR 520: Jct SR 513/Lake Washington Blvd" (PDF). Washington State Department of Transportation. May 20, 2015. Retrieved July 17, 2017.
- Lindblom, Mike (January 25, 2013). "520 'ramps to nowhere' to come down". The Seattle Times. p. A1. Retrieved September 1, 2017.
- Dougherty, Phil (May 17, 2016). "New State Route 520 floating bridge opens to traffic on April 25, 2016". HistoryLink. Retrieved September 1, 2017.
- "SR 520 Bridge Toll Rates". Washington State Department of Transportation. July 2017. Retrieved September 1, 2017.
- Romano, Benjamin J. (November 11, 2007). "Microsoft campus expands, transforms, inside and out". The Seattle Times. p. A1. Retrieved July 17, 2017.
- Fujioka, Justin (October 19, 2015). "When sharing can be a problem". WSDOT Blog. Washington State Department of Transportation. Retrieved August 28, 2017.
- Shaw, Greg (January 27, 2015). "A new 520 bike trail is re-shaping the Eastside". Crosscut.com. Retrieved August 31, 2017.
- Regional Trails in King County (PDF) (Map). King County Parks and Recreation Division. February 2017. Retrieved August 31, 2017.
- Federal Highway Administration (September 22, 2015). National Highway System: Seattle, WA (PDF) (Map). Federal Highway Administration. Retrieved August 31, 2017.
- "What is the National Highway System?". Federal Highway Administration. January 31, 2017. Retrieved August 31, 2017.
- "Transportation Commission List of Highways of Statewide Significance" (PDF). Washington State Transportation Commission. July 26, 2009. Retrieved August 31, 2017.
- "Highways of Statewide Significance". Washington State Department of Transportation. Retrieved August 31, 2017.
- 2016 Annual Traffic Report (PDF) (Report). Washington State Department of Transportation. 2017. p. 200. Retrieved August 31, 2017.
- "Chapter 1: Introduction to the Project" (PDF). SR 520, I-5 to Medina: Bridge Replacement and HOV Project Final Environmental Impact Statement. Washington State Department of Transportation. June 2011. OCLC 750115709. Retrieved September 1, 2017.
- Lindblom, Mike (June 4, 2002). "Seattle-to-Eastside trip is no longer 'reverse' commute". The Seattle Times. p. B1. Retrieved October 30, 2017.
- Stein, Alan J. (October 25, 1998). "Kirkland — Thumbnail History". HistoryLink. Retrieved July 17, 2017.
- Stein, Alan J. (February 10, 2013). "Leschi, the first auto ferry in Western Washington, is launched on Lake Washington on December 6, 1913". HistoryLink. Retrieved July 17, 2017.
- Reyonlds, Peggy (November 26, 1990). "'The biggest thing afloat'". The Seattle Times. p. A5. Retrieved July 19, 2017.
- Whitely, Peyton (April 16, 1998). "Before the Bridge: From 1870 to 1950, most Eastsiders who wanted to cross Lake Washington traveled by ferry". The Seattle Times. p. B3. Retrieved July 19, 2017.
- Boswell, Sharon; McConaghy, Lorraine (June 16, 1996). "A bridge to the future". The Seattle Times. Retrieved July 19, 2017.
- "State Orders Survey for 2nd Lake Bridge". The Seattle Times. August 31, 1949. p. 1.
- HAER No. WA-201: Evergreen Point Floating Bridge (Governor Albert D. Rosellini Bridge—Evergreen Point) (PDF). Historic American Engineering Record (Report). National Park Service. 2010. Retrieved July 19, 2017.
- "Details Of Multimillion Project Told". The Seattle Times. December 12, 1954. p. 1.
- "City Studies Analysis Of 5 Routes For Lake Bridge". The Seattle Times. December 27, 1957. p. 1.
- Willix, Douglas (November 11, 1957). "New Lake-Span Problems". The Seattle Times. p. 12.
- "Montlake-Evergreen Point Route Picked For 2nd Lake Bridge; Construction To Begin In 8 Months". The Seattle Times. United Press International. August 3, 1954. p. 1.
- Hittle, Leroy (December 12, 1956). "Highway Board View Is Indorsed". The Seattle Times. Associated Press. p. 1.
- Dougherty, Phil (June 26, 2015). "Evergreen Point Floating Bridge opens on August 28, 1963". HistoryLink. Retrieved August 26, 2017.
- "Montlake Club Protests Proposal For Lake Bridge". The Seattle Times. December 10, 1956. p. 25.
- "Firm Prepares To Build Pontoons For Lake Bridge". The Seattle Times. February 19, 1961. p. 26.
- "Senate Passes 2 Highway Bills". The Seattle Times. Associated Press. March 26, 1961. p. 41.
- "Chapter 21: Highways" (PDF). Session Laws of the State of Washington, 1961 extraordinary session. Washington State Legislature. April 3, 1961. p. 2617. Retrieved August 28, 2017.
- "Section of 10th Ave. E. To Be Closed". The Seattle Times. April 24, 1962. p. 29.
- Barr, Robert A. (September 19, 1962). "Work Goes Fast: 2nd Lake Span Spurting Ahead". The Seattle Times. p. 3.
- "Evergreen Span, Northrup Way To Be Linked". The Seattle Times. February 19, 1963. p. 9.
- "Rosellini Snips Ribbon to Open New Floating Bridge". The Seattle Times. August 28, 1963. p. C.
- "Traffic Routes to the Evergreen Point Floating Bridge". The Seattle Times. August 25, 1963. p. 4.
- Prahl, C. G. (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission. Retrieved August 26, 2017.
- "To End Confusion: Highways Given Different Numbers". The Seattle Times. January 26, 1964. p. 24.
- "Chapter 51: State Highways—Route Numbers" (PDF). Session Laws of the State of Washington, 1970 1st extraordinary session. Washington State Legislature. February 24, 1970. p. 380. Retrieved August 26, 2017.
- "Hearing Set On Extending Highway 520". The Seattle Times. September 11, 1966. p. 42.
- Barr, Robert A. (November 9, 1966). "2 Interchanges On East Side Freeway To Open Nov. 22". The Seattle Times. p. 1.
- Barr, Robert A. (August 4, 1968). "Plans Announced For Redmond Freeway". The Seattle Times. p. 17.
- "Work begins soon on Redmond-Seattle link". The Seattle Times. January 30, 1972. p. D20.
- "Four-lane highway link opens". The Seattle Times. December 10, 1973. p. D15.
- "Chapter 63: State Highways—Route Designations" (PDF). Session Laws of the State of Washington, 1975. Washington State Legislature. April 5, 1975. p. 131. Retrieved August 28, 2017.
- "New Redmond bypass will open tomorrow". The Seattle Times. July 14, 1977. p. D5.
- "Work begins next week on Redmond-bypass bridge". The Seattle Times. May 13, 1976. p. D9.
- "Extension of Highway 520 to Redmond to be discussed". The Seattle Times. August 11, 1976. p. H2.
- Sufia, David (November 24, 1976). "Bellevue's transit-land request makes Redmond mayor see red". The Seattle Times. p. D4.
- Sufia, David (December 15, 1976). "Two-city 'pact' on highway?". The Seattle Times. p. H7.
- United States nominal Gross Domestic Product per capita figures follow the Measuring Worth series supplied in Johnston, Louis; Williamson, Samuel H. (2017). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved July 28, 2017. These are the figures as of 2016.
- Burt, Lyle (June 16, 1977). "House OK's $690 million for highways". The Seattle Times. p. C1.
- Wilson, Marshall (October 18, 1978). "Lawsuit postpones Highway 520 bids". The Seattle Times. p. H1.
- "State plans to OK funds for 520". The Seattle Times. March 13, 1979. p. A9.
- Schulz, Elaine (December 30, 1981). "Council may reconsider 1-way streets". The Seattle Times. p. D4.
- SR-405 High Occupancy Vehicle Project Draft Environmental Impact Statement (Report). Washington State Department of Transportation. July 1982. p. II-28. OCLC 84172621. Retrieved August 28, 2017 – via Google Books.
- "Chapter 177: State Highways Routes Revised" (PDF). Session Laws of the State of Washington, 1985. Washington State Legislature. April 25, 1985. p. 674. Retrieved August 28, 2017.
- "Eastside Briefly". The Seattle Times. March 11, 1985. p. D1.
- "Eastside Briefly: N.E. 51st St. traffic temporarily rerouted". The Seattle Times. September 8, 1986. p. B1.
- Tizon, Alex (June 3, 1987). "City officials want to ease congestion on Route 520". The Seattle Times. p. H1.
- Norton, Dee; Brooks, Diane (April 5, 1994). "Hwy. 522 gets slice of repair budget". The Seattle Times. p. B1.
- Lopez Williams, Sarah (September 22, 1995). "520 lane fix: Help, not cure". The Seattle Times. p. B1.
- Lopez Williams, Sarah (October 11, 1996). "New lane on 520 may ease backups". The Seattle Times. p. B1.
- Johnston, Steve (August 28, 1996). "Twos, threes: 520 car-pool rules are all over the road". The Seattle Times. p. B1.
- Whitely, Peyton (October 5, 2000). "Hwy. 520 ramps expected to ease Redmond commute". The Seattle Times. p. B1.
- Bryant, Arelene (December 17, 2000). "Hwy. 520 adds ramp meters". The Seattle Times. p. B2.
- Giroux, Wendy (September 23, 2008). "Gregoire, officials, commuters tout success of 202 improvements". Redmond Reporter. Retrieved August 31, 2017.
- "WSDOT Joins Local Leaders to Kick off New SR 202 / SR 520 Flyover Ramp" (Press release). Washington State Department of Transportation. May 2, 2007. Archived from the original on December 29, 2009. Retrieved August 31, 2017.
- "Drivers to get a new lane as SR 520 project reaches milestone". Redmond Reporter. June 28, 2010. Retrieved August 31, 2017.
- Roe, Amy (May 3, 2007). "Redmond drivers may get reprieve". The Seattle Times. p. B3.
- "SR 520 – West Lake Sammamish Parkway to SR 202 – Open December 2010". Washington State Department of Transportation. March 2011. Archived from the original on May 30, 2011. Retrieved August 31, 2017.
- Pak, Samantha (December 16, 2010). "Ceremony kicks off the opening of new NE 36th Street Bridge". Redmond Reporter. Retrieved August 31, 2017.
- Oppmann, Patrick (March 31, 2009). "Critics slam Microsoft bridge as waste of stimulus money". CNN. Retrieved October 30, 2017.
- Whitely, Peyton (November 26, 1972). "Reversible lane tops ideas for Evergreen Point bridge". The Seattle Times. p. A5.
- Gough, William (August 28, 1988). "A bridge too small: At 25 years old, span of Route 520 is beset by chronic congestion". The Seattle Times. p. A1.
- Ervin, Keith; Whitely, Peyton; Lopez Williams, Sarah (March 16, 1997). "Highway 520: Going nowhere fast". The Seattle Times. p. A1. Retrieved September 1, 2017.
- Dudley, Brier; Whitely, Peyton (March 4, 1999). "Broken-down 520 bridge on last leg?". The Seattle Times. p. A1. Retrieved September 1, 2017.
- Singer, Natalie (August 28, 2003). "Crossing lake hits crossroads: Issues facing 520 bridge are comparable to '63, when span first opened". The Seattle Times. p. B1.
- Whitely, Peyton (November 22, 1997). "Lake Washington traffic study would involve variety of groups". The Seattle Times. p. A11.
- "Building the New SR 520 Bridge". Washington State Department of Transportation. Retrieved September 1, 2017.
- Thompson, Lynn (April 29, 2011). "Panel approves new 520 bridge – Six-lane highway McGinn is lone dissenter". The Seattle Times. p. B1. Retrieved September 1, 2017.
- Lindblom, Mike (December 27, 2011). "520 bridge tolling ready to roll". The Seattle Times. p. A1. Retrieved September 1, 2017.
- "SR 520 – Eastside Transit and HOV Project – Complete September 2015". Washington State Department of Transportation. 2015. Retrieved September 1, 2017.
- Lindblom, Mike (June 15, 2014). "Evergreen Point transit station opens Monday". The Seattle Times. p. B2. Retrieved September 1, 2017.
- Bush, Evan (April 12, 2016). "New 520 bridge has traveled long, long road to its opening". The Seattle Times. p. B7. Retrieved September 1, 2017.
- Lindblom, Mike (April 1, 2016). "Party time ahead for new 520 bridge". The Seattle Times. p. A8. Retrieved September 1, 2017.
- "SR 520 Bridge Replacement and HOV Program: Construction Progress Report, March 2017" (PDF). Washington State Department of Transportation. May 30, 2017. p. 4. Retrieved September 1, 2017.
- "SR 520 closing Aug. 25–28 to prepare for opening of new lanes" (Press release). Washington State Department of Transportation. August 18, 2017. Retrieved September 1, 2017.
- "SR 520 Rest of the West Open House" (PDF). Washington State Department of Transportation. June 2016. Retrieved September 1, 2017.
- Meredith, Julie; Kyle, Larry (May 12, 2016). "WSDOT finishing 'The Rest of the West' on SR 520". Seattle Daily Journal of Commerce. Retrieved September 1, 2017.
- Minnick, Benjamin (February 13, 2017). "WSDOT to seek design-build firm for $425M bridge, lid, trails at Montlake". Seattle Daily Journal of Commerce. Retrieved September 1, 2017.
- "Executive Summary and Introduction" (PDF). SR 520, I-5 to Medina: Bridge Replacement and HOV Project Section 106 Technical Report (Report). Washington State Department of Transportation. June 2011. pp. viii–x. Retrieved September 1, 2017.
- "Questions and Answers: Next Phase of SR 520 construction in Seattle" (PDF). Washington State Department of Transportation. May 31, 2017. p. 3. Retrieved September 1, 2017.
- Pryne, Eric (November 5, 2004). "Commuters settle bus-reroute dispute". The Seattle Times. p. B4. Retrieved August 31, 2017.
- Metro Transit System: Northeast Area (PDF) (Map). King County Metro. September 2016. Retrieved August 31, 2017.
- "Chapter 8: Transit" (PDF). SR 520, Medina to SR 202: Eastside Transit and HOV Project Environmental Assessment, Appendix Q: Transportation Discipline Report (Report). Washington State Department of Transportation. December 2009. p. 8-3. Retrieved August 31, 2017.
- Lindblom, Mike (May 14, 2017). "World's first light rail on a floating bridge: For I-90, Sound Transit had to invent 'a brilliant solution'". The Seattle Times. p. A12. Retrieved September 1, 2017.
- "East Link Extension Fact Sheet" (PDF). Sound Transit. October 2016. Retrieved September 1, 2017.
- "Downtown Redmond Link Extension Fact Sheet" (PDF). Sound Transit. May 2017. Retrieved September 1, 2017.
- "SR 520: Light Rail in the Corridor". Washington State Department of Transportation. Retrieved October 29, 2017.