Aqueduct Bridge (Potomac River)
First Aqueduct Bridge between 1860 and 1865
|Locale||Georgetown, Washington, D.C.|
|Other name(s)||Alexandria Aqueduct|
|Heritage status||Historic American Engineering Record|
|Followed by||Key Bridge|
|No. of spans||8|
|Designer||Major William Turnbull|
|Engineering design by||United States Army Corps of Engineers|
The Aqueduct Bridge (also called the Alexandria Aqueduct) was a bridge between Georgetown, Washington, D.C., and Rosslyn, Virginia. It was built to transport cargo-carrying boats on the Chesapeake and Ohio Canal in Georgetown across the Potomac River to the Alexandria Canal. The same eight piers supported two different bridges: a wooden canal bridge (a wooden roadway bridge was added on top of the canal later) and an iron truss bridge carrying a roadway and an electric trolley line. The bridge was closed in 1923 after the construction of the nearby Key Bridge. The shuttered Aqueduct Bridge was demolished in 1933.
In 1830, merchants from Alexandria, Virginia, which was still part of the District of Columbia at the time, proposed linking their city to Georgetown to capitalize on the new Chesapeake and Ohio Canal. Congress granted a charter to the Alexandria Canal Company in 1830, and construction soon began on the Aqueduct Bridge that would carry canal boats across the Potomac River and downriver on the south side without unloading in Georgetown. The bridge was designed by Major William Turnbull. Construction of the bridge and Alexandria Canal began in 1833, and both were completed in 1843. To withstand Potomac ice floes, the piers were made of gneiss, with icebreakers made of granite. The water-filled bridge was a weatherproofed-timber, queen-post truss construction. The bridge was 110 feet (33.5 m) wide across the top. It had eight piers, each set on riverbottom bedrock and 7 feet (2.1 m) wide at the top. The third and sixth piers were 16 feet (4.9 m) wide at the top. Each pier was designed so that its top was 30 feet (9.1 m) above the mean high water level. A narrow carriageway ran alongside the bridge. Later, a separate level for pedestrian and carriage traffic was added to the bridge. The tolls from the addition inhibited trade between Georgetown and Virginia, thus benefiting Alexandrian businessmen who retained Virginian trade.
In 1866, the Alexandria Canal Company leased the bridge for 99 years to three local businessmen. The existing wooden superstructure, which had decayed, was replaced with Howe trusses. Wooden arches were later added to strengthen the Howe trusses. In 1868, Congress passed legislation requiring the lessees of the bridge to maintain a highway on the bridge. To support this construction, the lessees were authorized to charge a toll. A wooden floor was placed atop the Howe trusses, and wooden trestles built on both ends to provide approaches to the bridge.
In the 1882, legislation was introduced in Congress to purchase the Aqueduct Bridge and open it to the public. But the bill did not pass. Legislation was again introduced in January 1884. This legislation was ultimately successful. At issue, however, was who would bear the cost of buying the bridge. Congress initially proposed that the District of Columbia shoulder the entire cost, but the city did not have the funds. Citizens in Virginia demanded that Congress pick up cost, arguing this was an interstate bridge and therefore a national concern. Congress passed the legislation, and appropriated $240,000 to purchase the bridge. The Alexandria Canal Company sold the bridge's piers for $85,000 and its deck for $50,000, and the deed was conveyed to the federal government on August 15, 1884. Almost immediately, a dispute broke out among the canal company's shareholders as to the distribution of the funds, which suspended the transfer of deed.
The safety of the bridge was quickly called into question. In December 1885, just a year after the bridge was purchased, the United States Army Corps of Engineers conducted a study that found the wooden bridge so unsafe that it should be removed. Again, cost considerations came to the fore. Legislation was introduced in Congress in May 1886 to have a new bridge built, with the D.C. government picking up half the cost. A D.C. engineering study of the bridge was conducted in September 1886 to again determine the bridge's safety. This report for the bridge so unsafe that it recommended immediate closure. The District government did so on October 5, 1886.
On October 20, 1886, the canal company shareholders finally settled on how to distribute the purchase funds amongst themselves. The District government then asked the Secretary of War (who supervised the Corps of Engineers) whether the federal government intended to repair the bridge or build a new one. But issues concerning the sale still plagued the bridge. Although a new deed of transfer was prepared in mid-November 1886, the Alexandria Canal Company sued the federal government in December 1886 to receive the full sale price all at once (rather than in installments). Another Corps engineering report on the bridge was made in January 1887. With the bridge again found to be unsafe to open, the federal government sued the canal company. The deed of sale, the government said, required the company to maintain a bridge that is open to travel for 20 years. This condition had not been met, and the government sought $84,500 in reimbursements to cover construction of a new deck.
Meanwhile, the Corps of Engineers reported in January 1887 that a new bridge could be constructed for $105,000 (the sum of money left over from the 1884 appropriation). With this money already in hand, no new legislation was needed. Bids for construction of the new bridge were received in March 1887, and a contract awarded to the Mt. Vernon Bridge Company. Work began in August. But extensive delays plagued the bridge. One reason for the delay was the need to obtain a new right-of-way from the Chesapeake and Ohio Canal, which the bridge would cross. Suit for the right-of-way was filed in December 1887, and the Chesapeake and Ohio Canal agreed to provide it (pending an appraisal) in January 1888. But work continued to be slow due to inefficient work practices by the contractor, delaying the opening until at least January 1889. A month later, about 600 feet (183 m) of substructure had been laid, and 75 feet (23 m) of superstructure. Construction problems delayed the opening of the bridge until June 1, 1889.
In 1889, the northern arch in the Washington abutment was enlarged so that the Georgetown Branch of the Baltimore and Ohio Railroad could pass underneath. When that line was abandoned, Water Street NW was extended west through the passageway to the Washington Canoe Club. The empty lot before the canoe club had previously been occupied by Dempsey's Canoe Livery. The rest of the Georgetown Branch right-of-way is now occupied by the Capital Crescent Trail. One of the piers was replaced in 1900.
In 1906, the Great Falls and Old Dominion Railroad (GF&OD) began to operate a single-track electric trolley line on a cantilever structure that the railroad had constructed on the bridge's west (upstream) side. In 1912, the GF&OD became the Great Falls Division of the new Washington and Old Dominion Railway.
Building Key Bridge
Proposals were made to replace Aqueduct Bridge as early as 1901. But these proposals were delayed when the McMillan Plan was issued in 1902. Congress approved the construction of a wooden superstructure that extended outward from the upstream side of the bridge's deck to carry electric trolleys between Georgetown and Rosslyn in 1902. Construction began in May 1903, and involved reconstruction of one of the bridge's piers. Built by the Great Falls and Old Dominion Railroad, trolleys of the railroad and its successor, the Washington and Old Dominion Railway, traversed the bridge until its closure in 1923.
Ice jams were a routine hazard on the Potomac River into the 1960s. Although the jams often stuck against the bridge, it weathered them well until 1908. Ice damaged some of the bridge's piers, requiring reconstruction of Pier No. 1 in the summer. Engineers discovered that many of the bridge's piers had been undermined by water, and rush repairs were made. But the aging structure continued to suffer damage, and by September 1912 the bridge was leaning dangerously to the west. Fears that the bridge would give way during the spring ice jams worsened. The bridge piers were extensively repaired again in 1913.
The Carlin bill
In March 1914, Representative Charles Creighton Carlin of Virginia sponsored legislation to replace Aqueduct Bridge with a new, $1 million structure. The Commissioners of the District of Columbia (the city's appointed government) approved of the new bridge in June. Controversy over the new bridge immediately broke out. Senator Claude A. Swanson, chairman of the Senate Committee on Public Works, wanted the new bridge built about 3,000 feet (910 m) downstream at the mouth of Rock Creek (at about 30th Street NW), where it would cross Analostan Island and the Potomac River to Rosslyn. Georgetown merchants strongly opposed this plan. There were some in Congress who wanted to repair the existing bridge, but a study by the United States Army Corps of Engineers in August 1914 showed that the existing structure was inadequate for the amount of traffic and too unstable to be saved. Secretary of War Lindley Miller Garrison, who oversaw the Corps, agreed that a new bridge was necessarily in December. Rep. William C. Adamson, chairman of the House Committee on Public Works, challenged Swanson and declared that the new bridge should be placed where the old one was.
The Carlin bill began moving through the House in January 1915. But House members balked at the cost. Garrison tried to break the deadlock on January 9 by issuing a report that declared the existing bridge unsafe, and requesting that the new one be built in the same location. The D.C. Commissioners said the location of the bridge was up to them, and the Corps warned that not only could the existing bridge not be enlarged but agreed with Garrison that it was structurally unsound. Swanson changed his mind, and agreed in January 1916 that the new bridge should be built on the existing site. Garrison endorsed the Carlin bill on January 27. On February 3, 1916, vehicular traffic over Aqueduct Bridge was limited by the city to a single automobile at a time due to its dangerous nature. The House passed legislation appropriating $1.175 million for construction of a new bridge on March 6. D.C. commissioners held hearings on the bridge site in late March, and approved the site in early April. The Senate passed some minor amendments to the House bill, and after some legislative discussions and a conference committee, the Carlin bill passed Congress on May 2, 1916. President Woodrow Wilson signed the legislation on May 19.
Demolition of Aqueduct Bridge
On June 1, 1916, the Army Corps of Engineers named the new bridge "Francis Scott Key Bridge," in honor of the man who had written the lyrics to the Star Spangled Banner whose home was just a few blocks from the bridge's abutment. Plans began to be drawn up at that time. The plans were nearly complete by September. When repairs on Aqueduct Bridge were made in October 1916 to prepare the structure for winter, the Corps discovered even more deterioration than before.
In January 1917, the Corps of Engineers found that inflation in the price of construction materials made it necessary to ask for $300,000 more in funding from Congress. Congress balked at paying. But citizen pressure and the danger of collapse due to ice flows in the spring convinced Congress to pay the money. Construction contracts were drawn up in late February, and excavation work on the D.C. abutments began in March. The first coffer dam for construction of the piers was sunk in May 1918, and, in July 1921, the Aqueduct Bridge was ordered to be closed. The new $2.35 million Key Bridge opened on January 17, 1923, whereupon the Aqueduct Bridge was closed to traffic.
Although Georgetown citizens pressed for the old Aqueduct Bridge span to remain open for use as a recreation site, the bridge was razed beginning in December 1933. The Aqueduct Bridge's superstructure and most of the above-water portions of its piers were removed in 1933. The bases of the piers were retained to protect the Key Bridge's piers from ice floe damage.
The piers, however, were criticized by recreational boaters (particularly rowers from nearby Georgetown University) as an obstacle to enjoyment of the river and a navigational hazard. Army engineers and Rep. Joel Broyhill refused to remove the piers, citing their value to protecting Key Bridge and the cost of their removal. But in August 1962, these groups agreed that seven of the eight Aqueduct Bridge piers would be removed (with one pier remaining as a historical marker). Dismantling of the piers began on September 11, 1962. The pilings were blasted out to a depth of 12 feet (3.7 m) below the waterline.
The Aqueduct Bridge's Washington abutment and a remnant of the bridge's Virginia abutment still survive. Both are located a short distance west (upstream) of the Key Bridge. The southern arch of the Washington abutment shelters rowing shells belonging to members of the Potomac Boat Club. Between the abutments, the preserved pier remains in place near the river's Virginia shoreline.
A coalition of Georgetown business groups and residents have joined with Georgetown University to advocate the construction of a gondola that would cross the river along the former path of the Aqueduct Bridge. Conceptual images show that a pole supporting the gondola's cables would rise from the bridge's remaining pier.
First bridge after superstructure built
Aerial view of Key Bridge and George Washington Memorial Parkway, with pier of Aqueduct Bridge visible in the foreground and remnant of Aqueduct Bridge abutment visible on the Virginia shoreline (c. 1990)
Pier and remnant of Virginia abutment of the Aqueduct Bridge upstream of Key Bridge (2005)
- Gillette, p. 18.
- Hurst, p. 4-5.
- Kapsch, p. 136.
- "Appendix B B B - Bridges at Washington, D.C.", p. 3641. Archived 2014-10-23 at the Wayback Machine. Accessed 2012-12-29.
- Reed, p. 144.
- Smith, Kathryn Schneider (1989). Port Town to Urban Neighborhood: The Georgetown Waterfront of Washington, D.C. 1880-1920. Washington DC: Kendall/Hunt Publishing Co. p. 8. ISBN 0-8403-5568-8.
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- "Free Bridge Across the Potomac." Washington Post. January 10, 1884.
- "The Proposed Free Bridge." Washington Post. February 19, 1884.
- "Proposed Free Bridge." Washington Post. March 17, 1884.
- "The Aqueduct Bridge." Washington Post. August 16, 1884.
- "The Bridge Dispute." Washington Post. October 13, 1886.
- "Two District Bridges." Washington Post. December 24, 1885.
- "The Free Bridge Conference." Washington Post. May 28, 1886; "Our Free Bridge." Washington Post. May 29, 1886.
- "The Aqueduct Bridge Unsafe." Washington Post. September 26, 1886.
- "The Aqueduct Bridge." Washington Post. October 4, 1886; "The Bridge to Be Closed." Washington Post. October 5, 1886.
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- "The Aqueduct Bridge." Washington Post. March 24, 1887.
- "Work on the Aqueduct Bridge." Washington Post. August 13, 1887.
- "The New Aqueduct Bridge." Washington Post. November 28, 1887.
- "The New Aqueduct Bridge." Washington Post. December 8, 1887.
- "The Aqueduct Bridge." Washington Post. January 6, 1888.
- "Work on the Bridges." Washington Post. January 11, 1888.
- "Work on the Bridges." Washington Post. February 10, 1888.
- "On the Free Bridge." Washington Post. June 2, 1889.
- "At Work in River Bed." Washington Post. September 3, 1900.
- Harwood, pp. 37-38.
- Harwood, pp. 42-49
- "Plans for New Bridge." Washington Post. February 7, 1901.
- "Aqueduct Bill Report." Washington Post. March 8, 1902.
- "Bridge Plans Held Up." Washington Post. February 27, 1903; "Tracks on Aqueduct Bridge." Washington Post. March 1, 1903.
- "Contract for Bridge Pier." Washington Post. April 12, 1903; "Delay on Aqueduct Bridge." Washington Post. July 17, 1904.
- "Pier Nearing Completion." Washington Post. June 17, 1908.
- "Holes in Bridge Piers." Washington Post. October 15, 1908; "Bridge in Good Condition." Washington Post. October 16, 1908.
- "Points to Adqueduct Bridge." Washington Post. September 15, 1912.
- "Wants A New Bridge." Washington Post. August 12, 1914.
- "To Push Bridge Bill." Washington Post. March 17, 1914.
- "Urge Bridge Improvement." Washington Post. March 19, 1914; "Approve Bridge Plan." Washington Post. June 20, 1914.
- "Wants 2 New Bridges."Washington Post. July 10, 1914.
- "Fights Bridge Change." Washington Post. July 13, 1914; "Near the Old Bridge." Washington Post." July 15, 1914.
- "Agree on New Bridge." Washington Post. December 25, 1914.
- "Adamson Declares Aqueduct Bridge Inadequate, Unsafe, and Unsightly." Washington Post. January 9, 1915.
- "Plead for New Bridge." Washington Post. January 9, 1915.
- "Finds Old Bridge Bad." Washington Post. January 10, 1915.
- "Aqueduct Plans Held Up." Washington Post. February 26, 1915.
- "Larger Bridge Loads Urged." Washington Post. October 29, 1915; "Old Bridge Is Unsafe." Washington Post. January 8, 1916.
- "Bridge Plea to Garrison." Washington Post. January 21, 1916.
- "Garrison For New Bridge." Washington Post. January 28, 1916.
- "Limits Aqeduct Traffic." Washington Post. February 4, 1916.
- "$1,000,000 For New Bridge." Washington Post. March 7, 1916.
- "Hearing on Bridge Monday." Washington Post. March 26, 1916; "Bridge Where It Is." Washington Post. April 6, 1916.
- "Credit for Aqueduct Bridge." Washington Post. May 3, 1916; "New Bridge Assured." Washington Post. May 3, 1916.
- "Signs Aqueduct Bridge Bill." Washington Post. May 20, 1916.
- "Ready to Draw Bridge Plans." Washington Post. June 2, 1916.
- "Hurry New Bridge Plans." Washington Post. September 10, 1916.
- "Bares Bridge's Weakness." Washington Post. October 8, 1916.
- "Adqueduct Bridge Plea." Washington Post. January 25, 1917.
- "Balks at Bridge Cost." Washington Post. February 17, 1917.
- "Citizens Want Bridge Now." Washington Post. February 19, 1917; "Aqueduct Bridge's Danger Is Passed." Washington Post. February 20, 1917.
- "Key Bridge Ready in 1919." Washington Post. February 28, 1917.
- "At Work For Key Bridge Abutment." Washington Post. March 29, 1918.
- "Key Coffer Dam Ready." Washington Post. May 12, 1918.
- "Order Bridge Closed." Washington Post. July 10, 1921.
- (1) Kelly, John (December 7, 2013). "The Potomac Aqueduct once took canal boats across the river". The Washington Post. Archived from the original on March 18, 2018. Retrieved March 17, 2018.
(2) "Key Bridge Is Opened." Washington Post. January 18, 1923.
- "Want Bridge Span Retained As A Pier." Washington Post. April 18, 1922.
- "Danger Great On Span Job, CWA Warned." Washington Post. December 16, 1933; "Civil Works Funds Used in Razing of Structure." Washington Post. December 26, 1933; "Skilled Labor Razing Bridge Gets Pay Boost." Washington Post. December 27, 1933; "Cold Wave Slows Razing of Bridge." Washington Post. December 30, 1933.
- Goode, p. 449.
- Carter, Elliot. "This Georgetown Bridge Was For Boats". Architect of the Capital: Hidden History of Washington, D.C. Archived from the original on February 5, 2017. Retrieved March 17, 2018.
- "Midriver Compromise Preserves A Pier of Old Aqueduct Bridge." Washington Post. August 22, 1962.
- "Army to Remove Old Bridge Piers to Clear Rowing Course on Potomac." Washington Post. July 20, 1962.
- Grant, Gerald. "6 Divers, Small Army of Equipment Dismantling Aqueduct Bridge Piers." Washington Post. September 12, 1962.
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- "Appendix B B B - Bridges at Washington, D.C." Annual Reports of the War Department for the Fiscal Year Ended June 30, 1901. Part 5. Report of the Chief of Engineers. United States Department of War. Washington, D.C.: Government Printing Office, 1901.
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- Kapsch, Robert J. Canals. New York: W.W. Norton and Library of Congress, 2004.
- Reed, Robert Carroll. Old Washington, D.C., in Early Photographs, 1846-1932. New York: Dover Publications, 1980.
- Turnbull, William. Reports on the Construction of the Piers of the Aqueduct of the Alexandria Canal across the Potomac River at Georgetown, District of Columbia. Engineer Department. United States Army. Washington, D.C.: Government Printing Office, 1873.
- Peterson, Arthur G. The Old Alexandria-Georgetown Canal & Potomac Aqueduct Virginia Magazine of History & Biography vol.40, no.4 (Oct. 1932)
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