|Length:||2,153.13 mi (3,465.13 km)|
|Existed:||1956 – present|
|History:||Completed in 1992|
|West end:||I-15 near Cove Fort, UT|
I-65 in Indianapolis, IN
I-75 in Dayton, OH
I-71 in Columbus, OH
I-77 in Cambridge, OH
I-79 in Washington, PA
I-81 in Hagerstown, MD
|East end:||Park and Ride in Baltimore, MD|
|States:||Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland|
Interstate 70 (I-70) is an Interstate Highway in the United States that runs from Interstate 15 near Cove Fort, Utah, to a Park and Ride near Baltimore, Maryland. It was the first Interstate Highway project in the United States. I-70 approximately traces the path of U.S. Route 40 (and also the old National Road) east of the Rocky Mountains. West of the Rockies, the route of I-70 was derived from multiple sources. I-70 is the fifth longest Interstate Highway, after I-90, I-80, I-40, and I-10.
The construction of I-70 in Colorado and Utah is considered an engineering marvel as the route passes through the Eisenhower Tunnel, Glenwood Canyon, and the San Rafael Swell. The Eisenhower Tunnel is the highest point along the Interstate Highway system with an elevation of 11,158 ft (3,401 m).
The sections of the interstate in Missouri and Kansas have laid claim to be the first interstate in the United States. Though disputed, the Federal Highway Administration has claimed the section of I-70 through Glenwood Canyon, completed in 1992, was the last piece of the Interstate Highway system, as originally planned, to open to traffic.
Route description 
Interstate 70 begins at an interchange with Interstate 15 near Cove Fort. Heading east, I-70 crosses between the Tushar and Pahvant ranges via Clear Creek Canyon and descends into the Sevier Valley where I-70 serves Richfield, the only town of more than a few hundred people along I-70's path in Utah. Upon leaving the valley near Salina I-70 crosses 7,923 ft (2,415 m) Salina Summit and then crosses a massive geologic formation called the San Rafael Swell.
Prior to the construction of I-70, the swell was inaccessible via paved roads and relatively undiscovered. Once this 108 mi (174 km) section was opened to traffic in 1970, it became the longest stretch of Interstate Highway with no services and the first highway in the U.S. built over a completely new route since the Alaska Highway. It also became the longest piece of interstate highway to be opened at one time. Although opened in 1970, this section was not formally complete until 1990 when a second steel arch bridge spanning Eagle Canyon was opened to traffic.
Since I-70's construction the swell has been discovered for its desolate beauty. The swell has since been nominated for National Park and/or National Monument status on multiple occasions. If the swell is granted this status it arguably would be the first time a National Park owes its existence to an Interstate Highway. Most of the exits in this span are view areas, brake check areas, and runaway truck ramps with few traditional freeway exits.
Entering from Utah, I-70 descends into the Grand Valley where it meets the Colorado River, which provides its path up the western slope of the Rocky Mountains. Here I-70 serves the Grand Junction metro area before traversing more mountainous terrain.
The last section of I-70 to be completed was the 15-mile (24 km) Glenwood Canyon. This stretch was completed in 1992 and was an engineering marvel due to the extremely difficult terrain and narrow space in the canyon, which requires corners that are sharper than normal Interstate standards. Construction was delayed for many years due to environmental concerns. The difficulties in building the road in the canyon were compounded by the fact that a railroad occupied the south bank and many temporary construction projects took place to keep U.S. Route 6 open, at the time the only east–west road in the area. Much of the highway is elevated above the Colorado River. The speed limit in this section is 50 mph (80 km/h) due to the limited sight distance and sharp corners. Great care was taken to not destroy the local ecosystem while building the road. All rest areas through this stretch use reclaimed water.
The Eisenhower–Johnson Memorial Tunnel, the highest vehicular tunnel in North America and the longest tunnel built under the Interstate program, passes through the Continental Divide. Because of the Eisenhower-Johnson Tunnel's existence, I-70 is one of few roads connecting ski resorts such as Copper Mountain, Beaver Creek and Vail with Denver and it is more likely to be open than alternative roads. After traversing the mountainous terrain, I-70 goes through Denver and intersects Interstate 25. Leaving Denver, I-70 traverses through wide plains through eastern Colorado before exiting into Kansas.
Bicyclists are permitted to use the shoulder lane of I-70 in portions of Colorado; this is one of the few sections of Interstate Highway where non-motorized vehicles are permitted to use the road.
When leaving the Rocky Mountains, the Denver skyline can be seen on a clear day. This can fool truckers and other unsuspecting drivers because there is still over 10 miles (16 km) of steep grade road before reaching the city. A series of signs warn truckers of the steep grade.
Coming from Colorado, I-70 enters the prairie, farmlands, and rolling hills of Kansas. This portion of I-70 was the first segment to start being paved and to be completed in the Interstate Highway System. It is given the nickname "Main Street of Kansas" as the interstate extends from the western border to the eastern border covering 424 miles (682 km) and passing through most of the state's principal cities in the process.
In Topeka, I-70 intersects I-470, twice. At the eastern intersection, the Kansas Turnpike merges, with I-70 becoming a toll road. This is one of only two sections of I-70 that are tolled. (The other is part of the Pennsylvania Turnpike.) I-70 carries this designation from Topeka to Kansas City, the eastern terminus of the turnpike. The tolled portion of the turnpike ends near Bonner Springs, just west of Kansas City. There is also a third child route in Topeka, I-335, which runs from I-470 south to meet up with I-35 in the Flint Hills town of Emporia. Just past the Bonner Springs Toll Plaza I-70 crosses I-435 for the first time, which allows travelers to bypass the downtown traffic via I-435, which encircles the Kansas City metropolitan area. About halfway between Topeka and Kansas City, Kansas, I-70 passes through Lawrence (home to the University of Kansas). Further down the highway in Kansas City, Kansas, approximately 3 miles (4.8 km) before the 18th Street Expressway, I-70 is intersected again by another child route. This route, I-635, runs from I-35 at its southern terminus up to I-29, just about 5 miles (8.0 km) across the Missouri river, at its northern terminus. From I-635 to just past the 7th Street (US 169) exit, I-70 runs adjacent Union Pacific's Armourdale Yard. Here I-670 (also designated "Alternate 70" on some signs) diverges, providing a more direct route that rejoins I-70 proper a few miles east in Missouri. The highway passes over the former stockyards and rail yard when it crosses the Kansas River on the Lewis & Clark Viaduct into downtown Kansas City, Missouri.
After crossing the Lewis & Clark Viaduct, I-70 enters Missouri. It encounters a loop of freeways, called the Alphabet Loop, which contains I-70 as well as I-35, I-670, U.S. 24, U.S. 40, U.S. 71, and U.S. 169. In the southern part of this loop, I-670 cuts directly through the downtown while I-70 bypasses the taller buildings a few blocks north near the Missouri River. Westbound I-670 is also designated Alternate I-70 making this the only permanent alternate interstate in the country. Most of the interstates in this loop are in their second mile, so all exits (no matter which interstate carries the road) are numbered 2 and suffixed with every letter of the alphabet except for I, O, and Z.
The section of I-70 in Downtown Kansas City is approximately the southern city limits of "City of Kansas" when it was incorporated in 1853. The first two auto bridges in Missouri mark the city's original boundaries with the Broadway Bridge (Kansas City) (U.S. Route 169) being the west boundary while the Heart of America Bridge (Route 9) is the east boundary. Another intersection of note is the second traverse of I-435. This is primarily notable because it immediately precedes the Truman Sports Complex (home of both Arrowhead Stadium and Kauffman Stadium) and also because the entrance ramps from I-435 northbound onto I-70 eastbound also serve as the exit ramps from I-70 into the Truman Sports Complex parking lots. This section of the Interstate is marked as the "George Brett Super Highway", named after the Kansas City Royals third baseman who played the entirety of his career (1973–1993) at the K. The last interstate intersection in the immediate Kansas City metro area is with I-470 in Independence.
After passing Kansas City, I-70 traverses the length of Missouri, west to east. It passes through the largest city between Kansas City and St. Louis, Columbia, which is about halfway between the two major cities, and the home of the University of Missouri. The terrain is rolling with some hills and bluffs near rivers. I-70 also crosses the Missouri River twice (as did the original US 40)--at Rocheport, about 15 miles (24 km) west of Columbia, and at St. Charles, about 20 miles (32 km) northwest of St. Louis. Most of the highway on this stretch is four-lane. Various proposals have been made to widen it (at an estimated cost of $3.5 billion) including turning it into a toll road. I-70 eventually gets into the St. Louis metro area and U.S. Route 40 splits to the south, along with U.S. Route 61, which does not have a concurrency with I-70. In late 2009, the intersecting road was upgraded to Interstate standards along with the finishing of the overhaul of Interstate 64. After this interchange, I-70 intersects two child routes, I-270 and I-170. I-70 then heads into the city limits of St. Louis, designated "The Mark McGwire Highway" after the Cardinals former first baseman (1997–2001), who hit 70 home runs in 1998 to break the single season record set by Roger Maris in 1961, allowing the number 70 to take on greater significance in St. Louis. It continues south to intersect with I-64, U.S. 40, and I-55, which then become concurrent as they head east to cross the Mississippi River on the Poplar Street Bridge.
The 1985 World Series between the Kansas City Royals and St. Louis Cardinals was nicknamed the "I-70 Series" because St. Louis and Kansas City are the two endpoints of I-70 in Missouri and the highway passed both the Cardinals' Busch Stadium and the Royals' Kauffman Stadium.
After crossing the Poplar Street Bridge, I-64 splits off, while I-55 and I-70 stay concurrent. When they intersect I-270, I-55 stays on its own pavement using the mileposts from the Poplar Street Bridge, while I-70 heads east on I-270's pavement using I-270's mileposts. So when I-55/70 intersects I-270 from the southeast, the exit numbers would be 20 A/B, whereas if I-70 intersects I-55/270 from the east, it would be exits 15 A/B.
I-70 will be rerouted from the Poplar Street Bridge to the New Mississippi River Bridge north of downtown St. Louis which is expected to be finished in 2015.
I-70 passes through numerous county seats in Illinois, among them Vandalia, the state capital from 1818-1839. It runs concurrent with Interstate 57 around Effingham and then proceeds east towards Indiana.
I-70 enters Indiana just to the west of Terre Haute and then crosses the Wabash River before skirting the south side of that city. After passing through many miles of gently rolling terrain in rural west-central Indiana, the freeway approaches the major metropolitan area of Indianapolis.
The main entrance to Indianapolis International Airport was relocated to I-70's exit #68 on November 11, 2008. It is significant to note that the ramp leading eastbound I-70 motorists to the counter-clockwise (southbound) lanes of I-465 and the multiplexed eastbound I-74 is now located at exit (and mile marker) #69, which you encounter just after entering Marion County. This places it about 3.9 miles (6.3 km) distant from the destination freeway (which is still crossed just prior to mile marker 73), likely making this one of the longest ramps on the entire Interstate System.
Upon nearing the central business district of Indiana's capital city, the visages of Lucas Oil Stadium and the newly-constructed (in 2011) JW Marriott Indianapolis hotel, with the city's skyline as their backdrop, now dominate the view to the north from the freeway. After passing just to the south of the world headquarters for Eli Lilly & Co., I-70 and Interstate 65 have a brief multiplex through the eastern side of downtown Indianapolis. The junction points of these two major routes are known locally as the south split and north split respectively.
It is also noteworthy that the other 2-digit Interstates serving Indianapolis do not reach the city's core. As a result, I-70 motorists must use the I-465 beltway in order to reach I-69 without leaving the Interstate System, while those similarly bound for I-74 access that route via its multiplex around the southern portion of the I-465 loop.
After passing through much of the near northeast side of Indianapolis, I-70 again encounters the I-465 beltway (which carries a multitude of unsigned U.S. and Indiana state routes). I-70 continues on nearly due east from this point, first traveling through suburban Indianapolis, then transitioning into rural east central Indiana, where it passes just to the south of the city of New Castle. Upon reaching the Richmond area, U.S. 35 joins I-70 just before both routes leave the Hoosier State together and enter Ohio.
Interstate 70 enters Ohio just east of the interchange with U.S. 40 at Richmond, Indiana. Immediately to the east of this border, travelers notice a unique teal-blue arch that spans the width of the freeway, with a "Welcome to Ohio" greeting sign above the eastbound lanes. A sign thanking travelers for visiting Ohio is mounted on the other side of the arch for westbound travelers. Continuing eastbound, I-70 intersects Interstate 75 north of Dayton, followed by I-675 on the east side of Dayton. Springfield is the next city, site of Buck Creek State Park.
I-70 then encounters the largest city in Ohio, Columbus. Columbus is bounded by I-270, and is roughly centered around the intersection of I-70 and Interstate 71, which share the same asphalt through a notoriously congested 1.5-mile (2.4 km) stretch locally known as the "South Innerbelt" or, more commonly, "The Split." This stretch has I-71 concurrent with I-70, where I-71 enters and exits from opposite sides of I-70, causing traffic getting on I-70 from I-71 northbound to have to cross 4 lanes of I-70 traffic to continue on I-71. A similar issue is present for southbound I-71 traffic as well. The Split will be reconstructed within the next few years. Interstate 670 connects Port Columbus International Airport with I-270, I-71, and I-70. East of Columbus, I-70 passes through Zanesville and on to Cambridge, where it intersects Interstate 77. Continuing on towards West Virginia, I-70 intersects Interstate 470 just east of St. Clairsville. I-470 is primarily used for through traffic, and to avoid The Festival of Lights traffic during the holidays. In March 1995, a hole (from a former coal mine) opened up on the eastbound side of I-70 in Guernsey County near Old Washington, causing traffic to be rerouted onto US 40 between Old Washington and Cambridge for several months.
West Virginia 
The portion of I-70 in West Virginia crosses the Ohio River at Wheeling and runs through the Wheeling Tunnel. I-70 has only one through lane in each direction at the tunnel. A major interchange was planned but never completed on the east side of the Wheeling Tunnel. Upon merging with I-470, I-70 goes uphill towards Dallas Pike, West Virginia, This part of the road is called "Two Mile Hill", which is known locally for the many accidents at the bottom of the hill. I-70 has brought major development in Ohio County, the only county the route passes through in West Virginia, in the past few years. On the north side of the highway a former strip mine is being developed into a retail area called the Highlands. This stretch of Interstate 70 is the shortest I-70 is in any state, traveling only 15 miles (24 km) from the Ohio River to the Pennsylvania border.
I-70 was initially envisioned to go through downtown Pittsburgh but now goes south of it. Its originally planned route was later incorporated into I-376, as well as parts of I-76 and I-79. I-70 also overlaps I-79 near the Pittsburgh suburb of Washington for 3 miles (4.8 km).
The 38 miles (61 km) of I-70 between Washington and New Stanton is a sub-standard section of the highway. This section of I-70 used to be PA 71. It is characterized by sharp curves, limited sight distance, narrow shoulders, and lack of merge lanes at interchanges. Traffic on clover leaf ramps must weave in the right through lane of traffic due to the lack of a third lane for entering and exiting traffic. Other on and off ramps effectively function as RIRO, forcing vehicles to weave in and out of the exit lane. The speed limit on this stretch is 55 mph (90 km/h).
From New Stanton to Breezewood, I-70 overlaps I-76 and the Pennsylvania Turnpike. This is one of only two tolled sections of I-70 (the other being in Kansas, where the portion of the Kansas Turnpike east of Topeka is signed I-70).
Drivers on I-70 near Breezewood have to leave the freeway and travel a few blocks on US 30 past several traffic lights before returning to the freeway. This stretch of I-70 is one of the few gaps on the Interstate Highway System.
I-70 continues on almost due south to the Maryland border after leaving I-76/Pennsylvania Turnpike at Breezewood. After the border, it intersects with I-68 going towards Baltimore and Washington, D.C.
In Maryland, Interstate 70 runs from the Pennsylvania state line near Hancock east across the central portion of the state towards Baltimore, following the route of the National Road, now known as U.S. 40. It is the major east–west highway in the state, serving the cities of Hagerstown and Frederick and bypassing Ellicott City. East of Frederick, the route was originally designated Interstate 70N. The route serves Washington D.C. via Interstate 270, which was once designated Interstate 70S. Uniquely, Interstate 70 indirectly serves a branch of the Washington Metro at Shady Grove via Interstate 370, which only connects to Interstate 270.
Besides being the first Interstate to receive a contract for pavement, other oddities happened with I-70 as well:
As first proposed, the western terminus of I-70 was Denver, Colorado. Utah and Colorado pressured the federal government to extend the plans for I-70 farther west, arguing that a direct link between Denver, Colorado and Salt Lake City, Utah was vital for an effective highway system. The proposal was to follow what is now U.S. Route 6 west and connect to I-15 at Spanish Fork, Utah. Federal planners (influenced by the military) agreed to extend the proposed route of I-70, but not to serve Salt Lake. The military wanted to better connect southern California with the North Eastern U.S. This led to I-70's constructed route through the San Rafael Swell and terminating at Cove Fort. Many motorists include I-70 as part of their cross-country drives between New York City and Los Angeles (which are accessible to I-70 via other interstates).
As a result of freeway revolts in the Baltimore area, Interstate 70 was not completed east of Maryland Route 122 to its planned terminus on Interstate 95 within the city of Baltimore, and for all intents and purposes, ends at a four-way symmetrical stack interchange with Interstate 695, the Baltimore Beltway. In reality, I-70 ends at a Park and Ride lot at Route 122 as the freeway enters the city of Baltimore at Exit 94. Commuters park their cars in spaces on the pavement where high-speed freeway lanes were to be.
The highway gave its name to the I-70 Killer, a serial killer who committed a string of murders within a few miles of it in several Midwestern states in the early 1990s. No suspect has ever been apprehended despite the widespread publicity the murders have generated, including their being featured several times on the television show America's Most Wanted and Unsolved Mysteries.
The 1985 World Series was a contest between the St. Louis Cardinals and the Kansas City Royals, and won by the Royals. As these cities are primarily connected by Interstate 70, this World Series was often referred to as the I-70 Series in the media.
Major intersections 
- Interstate 15 in Cove Fort, Utah
- Interstate 76 in Arvada, Colorado
- Interstate 25 in Denver, Colorado — the Mousetrap
- Interstate 225 in Aurora, Colorado
- Interstate 135 near Salina, Kansas
- Interstate 435 near Bonner Springs, Kansas
- Interstate 635 in central Kansas City, Kansas
- Interstate 35 in Kansas City, Missouri (concurrent between exits 2A and 2H)
- Interstate 29 in Kansas City, Missouri. I-29 Begins/Ends at this downtown interchange
- Interstate 435 east of Kansas City, Missouri
- Interstate 470 in Independence, Missouri
- Interstate 270 between Natural Bridge Junction, Missouri and Champ, Missouri
- Interstate 170 near Lambert-St. Louis International Airport
- Interstate 44/Interstate 55/Interstate 64 in St. Louis, Missouri. All four routes join here to cross the Mississippi River via the Poplar Street Bridge, which also carries U.S. 40.
- Interstate 64 in East Saint Louis, Illinois (while still concurrent with Interstate 55)
- Interstate 255 west of Collinsville, Illinois (while still concurrent with Interstate 55)
- Interstate 55/Interstate 270 near Troy, Illinois.
- Interstate 57 in Effingham, Illinois (concurrent for 6 miles (10 km))
- Interstate 74/Interstate 465 on the west side of Indianapolis, Indiana
- Interstate 65 in Indianapolis, Indiana (concurrent for 2 miles (3 km))
- Interstate 465 on the east side of Indianapolis, Indiana
- Interstate 75 near Dayton, Ohio
- Interstate 675 between Dayton, Ohio and Springfield, Ohio
- Interstate 270 on the west side of Columbus, Ohio
- Interstate 71 in Columbus, Ohio (concurrent for 2 miles (3 km))
- Interstate 270 on the east side of Columbus, Ohio
- Interstate 77 in Cambridge, Ohio
- Interstate 79 in Washington, Pennsylvania
- Interstate 76 in New Stanton, Pennsylvania. They stay joined until Breezewood, Pennsylvania (approximately 88 miles (142 km)). While concurrent, they are part of the Pennsylvania Turnpike; thus, this is a tolled section of both Interstates.
- Interstate 99 in Bedford, Pennsylvania (no direct freeway-to-freeway connection)
- Interstate 68 in Hancock, Maryland
- Interstate 81 near Hagerstown, Maryland
- Interstate 270 in Frederick, Maryland
- Interstate 695 near Baltimore, Maryland
Auxiliary routes 
I-70 has one of the closest distances between two distinct child interstates with the same child interstate number. I-470 near Topeka, Kansas and I-470 on the east side of Kansas City, Missouri are approximately 72 miles (116 km) apart. This record is surpassed by I-291 around Hartford, Connecticut and I-291 near Springfield, Massachusetts which are unrelated, but are 23 miles (37 km) apart.
A breakdown of I-70's child routes follows:
- I-270 is a short connector between I-70 and I-25 in Denver, Colorado. It also carries U.S. 36 along its entire length.
- I-470 is a loop around the south side of Topeka, Kansas.
- I-670 is an alternate route of I-70 in Kansas City, Kansas and Kansas City, Missouri.
- I-470 is a connector between I-70 and I-435 in southeastern Kansas City and Independence, Missouri.
- I-170 is a connector between I-64 and I-270 in St. Louis County, Missouri.
- I-270 loops around St. Louis city and county. It is supplemented by I-255 to the east.
- I-270 is a beltway around Columbus, Ohio.
- I-670 is a 9.37 mile highway beginning at I-70 west of Downtown Columbus and terminating at I-270 in eastern Columbus that also provides direct access to Port Columbus International Airport from downtown.
- I-470 is a southern bypass around Wheeling, West Virginia.
- I-270 is a spur to Washington, D.C.. It was formerly designated I-70S.
- I-370 is a spur to Gaithersburg and Rockville, Maryland from I-270. It never connects to I-70.
- I-170 was to have been a spur into downtown Baltimore, Maryland, but the short part that opened never connected to I-70 or to any other Interstate Highway. It was decommissioned in 1989, and US 40 is the current designation for the freeway.
- "Route Log- Main Routes of the Eisenhower National System of Interstate and Defense Highways - Table 1". Federal Highway Administration. Retrieved February 7, 2007.
- "Eisenhower Interstate System". Eisenhower Presidential Library and Museum. Archived from the original on 2007-01-27. Retrieved 2007-01-30.
- Stufflebeam Row, Karen; LaDow, Eva and Moler, Steve (2004-03). "Glenwood Canyon 12 Years Later". Public Roads (United States Department of Transportation – Federal Highway Administration) 67 (5). Retrieved 2009-08-09.
- "Interstate 70". Utah Highways (personal site). Retrieved 2007-01-30.
- "Ask the Rambler: Why Does I-70 End in Cove Fort, Utah?". Federal Highway Administration. Retrieved 2007-01-30.
- "Shortest and longest 3-digit interstates".
- "Missouri official calls for rebuilding I-70". Kansas City Business Journal. 8 February 2006. Retrieved 2007-01-30.
- "Route 40/61 Corridor Projects". Missouri Department of Transportation. Retrieved 2007-01-30.
- Manuel Roig-Franzia, "The Town That Stops Traffic: Travelers Encounter Way Station as Way of Life in Breezewood," Washington Post, 22 November 2001, B1.
- Rob Hiaasen, "Go west, young man: Like Horace Greeley’s famed advice, curious sign on I-70 beckons yonder," Baltimore Sun, June 4, 2007, available at http://www.baltimoresun.com/entertainment/custom/today/bal-lifestyle-gowest,0,2235720.story
|Wikimedia Commons has media related to: Interstate 70|
- Geographic data related to Interstate 70 at OpenStreetMap
- Route of Interstate 70 overlaid on Google Maps