The Ambassador Bridge is a
tolled international
suspension bridge across the
Detroit River that connects
Detroit, Michigan
Detroit ( , ; , ) is the largest city in the U.S. state of Michigan. It is also the largest U.S. city on the United States–Canada border, and the seat of government of Wayne County. The City of Detroit had a population of 639,111 at ...
, United States, with
Windsor, Ontario
Windsor is a city in southwestern Ontario, Canada, on the south bank of the Detroit River directly across from Detroit, Michigan, United States. Geographically located within but administratively independent of Essex County, it is the southe ...
, Canada. Opened in 1929, it is the busiest international
border
Borders are usually defined as geographical boundaries, imposed either by features such as oceans and terrain, or by political entities such as governments, sovereign states, federated states, and other subnational entities. Political bo ...
crossing in North America in terms of trade volume, carrying more than 25% of all merchandise trade between the United States and Canada by value. A 2004 Border Transportation Partnership study showed that 150,000 jobs in the
Detroit–Windsor region and
US$13 billion in annual production depend on the Detroit–Windsor international border crossing.
The bridge is one of the few privately owned US–Canada crossings; it was owned by
Grosse Pointe
Grosse Pointe refers to an affluent coastal area next to Detroit, Michigan, United States, that comprises five adjacent individual cities. From southwest to northeast, they are:
* Grosse Pointe Park
* Grosse Pointe
* Grosse Pointe Farms
* Grosse ...
billionaire
Manuel Moroun, until his death in July 2020, through the Detroit International Bridge Company in the United States and the Canadian Transit Company in Canada. In 1979, when the previous owners put it on the
New York Stock Exchange
The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange in the Financial District of Lower Manhattan in New York City. It is by far the world's largest stock exchange by market capitalization of its listed ...
and shares were traded, Moroun was able to buy shares, eventually acquiring the bridge.
The bridge carries 60 to 70 percent of commercial truck traffic in the region. Moroun also owned the Ammex Detroit
duty free stores at both the bridge and the tunnel.
History

The passage across the
Detroit River became an important traffic route following the
American Civil War
The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by state ...
. The
Michigan Central and the
Great Western railroads in addition to others operated on either side of the border connecting
Chicago
(''City in a Garden''); I Will
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, map_caption = Interactive Map of Chicago
, coordinates =
, coordinates_footnotes =
, subdivision_type = List of sovereign states, Count ...
with the
Atlantic Seaboard. To cross the Detroit River, these railroads operated ferries between docks on either side. The ferries lacked the capacity to handle the shipping needs of the railroads, and there were often 700–1,000 freight cars waiting to cross the river, with numerous passengers delayed in transit. Warehouses in Chicago were forced to store grain that they could not ship to eastern markets and foreign goods were stored in eastern warehouses waiting shipment to the western United States. The net effect of these delays increased commodity prices in the country, and both merchants and farmers wanted a solution from the railroads.
The Michigan Central proposed the construction of a tunnel under the river with the support of their counterparts at the Great Western Railway. Construction started in 1871 and continued until ventilating equipment failed the next year; work was soon abandoned. Attention turned in 1873 to the alternative of building a railroad bridge over the river. The
U.S. Army Corps of Engineers commissioned a study of a bridge over the Detroit River. Representatives of the shipping industry on the
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five la ...
opposed any bridge with piers in the river as a hazard to navigation. Discussions continued for the remainder of the decade to no avail; a bridge over the Detroit River was not approved. The
U.S. Congress requested a new study for a bridge in 1889, but no bridge was approved. Finally, the Michigan Central built the
Detroit River Tunnel
The Michigan Central Railway Tunnel is a railroad tunnel under the Detroit River connecting Detroit, Michigan, in the United States with Windsor, Ontario, in Canada. The U.S. entrance is south of Porter and Vermont streets near Rosa Parks Bo ...
in 1909–10 to carry trains under the river. This tunnel benefited the Michigan Central and Great Western railroads, but the
Canada Southern Railway and other lines still preferred a bridge over the river.
Plans for a bridge were revived in 1919 to commemorate the end of
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
and to honor the "youth of Canada and the United States who served in the Great War".
However neither Ontario nor Michigan wanted to finance a river crossing. Michigan automakers subsequently decided to take the initiative to connect the
Midwest to
central Canada
Central Canada (french: Centre du Canada, sometimes the Central provinces) is a region consisting of Canada's two largest and most populous provinces: Ontario and Quebec. Geographically, they are not at the centre of Canada but instead overlap ...
. After they created a bridge company, the project got into trouble when a Toronto financier hired to sell its securities instead embezzled the money and ran off, before ultimately committing suicide in a prison cell after conviction for murdering a drugstore clerk. The bridge boosters turned to New Yorker Joseph A. Bower, a businessman who specialized in rescuing mismanaged companies. Bower succeeded in raising the necessary initial $12 million. "The only way things can be done today, is by private business," said
Henry Ford
Henry Ford (July 30, 1863 – April 7, 1947) was an American Technological and industrial history of the United States, industrialist, business magnate, founder of the Ford Motor Company, and chief developer of the assembly line technique of ...
, who backed the project. The bridge was constructed with investment from Detroit business people incorporated as the Detroit International Bridge Corporation.
Berkshire Hathaway
Berkshire Hathaway Inc. () is an American Multinational corporation, multinational conglomerate (company), conglomerate holding company headquartered in Omaha, Nebraska, United States. Its main business and source of capital is insurance, from ...
acquired a quarter of the shares before selling to another investor in the company, local trucking entrepreneur
Manuel Moroun. Moroun continued buying further eventually privatizing it.
The Ambassador Bridge opened November 15, 1929, at a total cost of $23.5 million.
In April 1930, shortly after the bridge opened, a Canadian immigration inspector jumped to his death. The
bridge
A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
has been used by other
suicide jumpers. After it opened, high divers considered it as a venue for a record; but after measurements of the height and currents were taken into account, they were dissuaded and abandoned the attempt.
On November 14, 2000, a scaffold on the bridge collapsed, sending three men into the Detroit River and leaving four workers dangling from safety harnesses. Jamie Barker, one of the workers who fell into the water, died. An engineer, George Snowden, was disciplined by
Professional Engineers Ontario for his role in the collapse; in 2012, a design that Snowden approved caused the
Radiohead stage collapse in Toronto. Snowden's associate Domenic Cugliari was also involved in both collapses.
Access to the Ambassador Bridge was impeded by protesters during the
Freedom Convoy 2022 protests in Canada. Protesters at the bridge blockaded it on February 7. On the evening of February 7, traffic at the bridge came to a complete halt. The blockade continued into February 8. On the morning of February 8, officials declared the bridge reopened, but the blockade later resumed, pushing trips to the
Blue Water Bridge between
Sarnia and
Port Huron
Port Huron is a city in the U.S. state of Michigan and the county seat of St. Clair County. The population was 30,184 at the 2010 census. The city is adjacent to Port Huron Township but is administered separately.
Located along the St. Clair ...
.
Utilization statistics
Transport Canada
Transport Canada (french: Transports Canada) is the department within the Government of Canada responsible for developing regulations, policies and services of road, rail, marine and air transportation in Canada. It is part of the Transporta ...
reported the following distribution for the 20 largest U.S.–Canada border crossings by trucks in 2011:
# 24.4% for Windsor-Ambassador Bridge
# 14.4% for
Sarnia–
Blue Water Bridge
# 11.4% for
Fort Erie–
Peace Bridge
# 7.0% for
Pacific Highway/
Douglas
# 6.6% for
Niagara Falls
Niagara Falls () is a group of three waterfalls at the southern end of Niagara Gorge, spanning the border between the province of Ontario in Canada and the state of New York in the United States. The largest of the three is Horseshoe Fall ...
–
Queenston Bridge
Design

The bridge over the
Detroit River had the
longest suspended central span in the world when it was completed in 1929—. This record held until the
George Washington Bridge between New York and New Jersey opened in 1931. The bridge's total length is . Construction began in 1927 and was completed in 1929. The
general contractor
A general contractor, main contractor or prime contractor is responsible for the day-to-day oversight of a construction site, management of vendors and trades, and the communication of information to all involved parties throughout the course of ...
and steel erector was the McClintic-Marshall Company of
Pittsburgh
Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...
,
Pennsylvania
Pennsylvania (; (Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Ma ...
.
The bridge is made up of 21,000
short tons (19,000
tonne
The tonne ( or ; symbol: t) is a unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...
s) of steel, and the
roadway rises as high as 152 feet (46 m) above the Detroit River. Only the main span over the river is supported by suspension cables; the approaches to the main pillars are held up by steel in a
cantilever truss structure.
The bridge's only sidewalk is on the structure's southwest side. After the
September 11 attacks
The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by al-Qaeda against the United States on Tuesday, September 11, 2001. That morning, nineteen terrorists hijacked four commerc ...
, pedestrians and bicycles were prohibited from traveling across the bridge due to increased security measures. For years prior to September 11, 2001, the sidewalk was closed due to ongoing maintenance projects and repainting.
Originally painted gloss black, the bridge underwent a five-year refurbishment between 1995 and 2000, which included stripping and repainting the bridge
teal.
Granite blocks, originally used on the U.S. side, were given to the
Windsor Parks and Recreation Department, and now grace many of the pathways in Windsor parks.
Capacity
The Ambassador Bridge is the busiest crossing on the
Canada–United States border
The border between Canada and the United States is the longest international border in the world. The terrestrial boundary (including boundaries in the Great Lakes, Atlantic, and Pacific coasts) is long. The land border has two sections: Can ...
.
The four-lane bridge carries more than 10,000 commercial vehicles on a typical weekday. The
Gateway Project, a major redesign of the U.S. plaza completed in July 2009, provides direct access to
Interstate 96
Interstate 96 (I-96) is an east–west Interstate Highway that runs for approximately entirely within the Lower Peninsula of the US state of Michigan. The western terminus is at an interchange with US Highway 31 (US 31) and B ...
(I-96) and
I-75
Interstate 75 (I-75) is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. As with most Interstates that end in 5, it is a major cross-country, north–south route, traveling from St ...
on the American side and
Highway 3 on the Canadian side. The Canadian end of the bridge connects to busy city streets in west Windsor, leading to congestion.
The privately-owned bridge carries approximately 25% of trade between Canada and the United States.
Additional bridge proposals

The Canadian and United States governments have approved the construction of the
Gordie Howe International Bridge proposed by the Detroit River International Crossing (DRIC) commission.
The new bridge further downriver between Detroit and Windsor will be owned and operated by the
Windsor–Detroit Bridge Authority, a Crown corporation owned by the Canadian federal government.
Manuel Moroun, owner of the Ambassador Bridge until his death in 2020, spoke out against this proposal. He sued the governments of Canada and Michigan to stop its construction, and released a proposal to build a second span of the Ambassador Bridge (which he would own) instead. Critics suggest that Moroun's opposition was fueled by the prospect of lost profits from duty-free gasoline sales, which are exempt from about 60 cents per gallon in taxes even though the pump price to consumers is only a few cents lower.
On May 5, 2011, a judge dismissed the case, citing a lack of reasoning for it to proceed. Moroun and his Detroit International Bridge Company contended that the new bridge would affect its proposal for a second span which would be built next to the Ambassador Bridge.
Michigan and Canadian authorities continued to support the Gordie Howe International Bridge proposal, as it directly connects the Canadian
E.C. Row Expressway
The E. C. Row Expressway is a municipal expressway in the city of Windsor, Ontario, Canada. It divides the city in half as it crosses it between the Ojibway Parkway in the west and Banwell Road in the east, a distance of . It was built between 19 ...
and the 2015 extension of
Ontario Highway 401
King's Highway 401, commonly referred to as Highway 401 and also known by its official name as the Macdonald–Cartier Freeway or colloquially referred to as the four-oh-one,
is a Controlled-access highway, controlled-access 400-series high ...
(which runs concurrently as a shared highway for to the future crossing as the Windsor–Essex Parkway) with I-75 and I-96 in Michigan, bypasses Windsor's surface streets and reduces congestion. A twin span adjacent to the Ambassador Bridge, by itself, does not address Canadian concerns about traffic on
Huron Church Road in Windsor. While many of the stop lights commonly cited have been removed by the expansion of Highway 401 which will connect to the downriver Howe bridge, the final approach to the Ambassador Bridge remains on overcrowded Windsor surface streets.
In 2007, the privately owned bridge company was granted a permit by the
Michigan Department of Environmental Quality to build a new bridge across the Detroit River adjacent to the existing span. The permit expired in 2012. The
U.S. Coast Guard issued the bridge company a permit in 2016 to construct the new span. As of 2021, construction cannot proceed until current bridge owner Matthew Moroun addresses a "conflict" with the bridge's permit issued for the Canadian side by Transport Canada in 2017. The Coast Guard permit was granted on the condition that the existing Ambassador Bridge would be retained and rehabilitated, while the Transport Canada permit was granted on the condition that the existing bridge would be dismantled and removed.
Controversies
The bridge's private ownership has been controversial as the bridge carries approximately 25% of trade between Canada and the United States.
Although alternate routes exist, including the nearby
Detroit–Windsor Tunnel, preventing monopoly status, the route is of significant value since it passes directly through major metropolitan areas. The aforementioned tunnel prohibits certain vehicles.
In 2010 and 2011, the Wayne County Circuit Court found the Detroit International Bridge Company in contempt for failing to directly connect bridge access roads to I-75 and I-96, and making other required improvements as part of the
Gateway Project.
These improvements would normally be under the control of the state government; however, the Detroit International Bridge Company withheld the improvements as part of a negotiation strategy. At one point, Matty Moroun and his chief deputy at the Detroit International Bridge Co, Dan Stamper, were jailed for non-compliance with orders to complete the on-ramps.
After years of legal battles, activism by local people against neighborhood truck traffic, and stalling by Matty Moroun, the
Michigan Department of Transportation (MDOT) took over the I-75/I-96 on-ramp project and opened the ramps in September 2012 after a six-month construction period. One possible motive for the Gateway Project delays was Moroun's desire to route traffic past his lucrative duty-free store and fuel pumps, one of only two border locations to sell untaxed fuel (the other is
International Falls, Minnesota).
Critics of the duty-free fuel operation objected that sixty cents from each U.S. gallon went not to paving Michigan's underfunded highways but instead directly to Matty Moroun.
Operators of large trucks under the
International Fuel Tax Agreement, which in theory should impose Ontario tax and partially refund Michigan tax on fuel purchased in Detroit and consumed on Ontario's Highway 401, may be disqualified for the Michigan IFTA refund, as the tax was never paid. In a 2012 lawsuit, the
Michigan Department of Agriculture and Rural Development sued Moroun's company, Ammex, claiming it mislabeled motorcar fuels to advertise 93 octane while tests showed as little as 91.2 octane.
In 2015, Windsor city officials criticized the decaying appearance of the bridge and called attention to the hazard posed by crumbling concrete from its superstructure. In response, Matt Moroun accused the city of attempting to thwart the company's efforts to rebuild or repair the structure because the Canadian government is supporting plans for a new bridge across the Detroit River downriver.
Starting at 3pm on February 7, 2022, a blockade related to the
Freedom Convoy protests shut down traffic on the bridge for about a week, causing disruptions at automobile manufacturing plants on both sides of the border.
See also
*
Blue Water Bridge, which links Port Huron, Michigan, to Sarnia, Ontario
*
Sault Ste. Marie International Bridge, which links Sault Ste. Marie, Michigan, to Sault Ste. Marie, Ontario
*
List of bridges in Canada
This is a list of bridges and viaducts in Canada, including those for pedestrians and vehicular traffic.
Historical and architectural interest bridges
There are only a few covered bridges left in Canada compared to all those that were built in t ...
References
Further reading
*
*
External links
Ambassador Bridge Official Website*
Detroit News archives: The Building of the Ambassador BridgeNPR profile: Private Bridge on Canada Border a Security ConcernSouthwestern Ontario Digital Archive: Subject: Ambassador Bridge (Windsor Detroit)
{{Authority control
Art Deco architecture in Canada
Art Deco architecture in Michigan
Bridges completed in 1929
Bridges in Detroit
Buildings and structures in Windsor, Ontario
Canada–United States border crossings
Canada–United States bridges
Detroit River
Lake Erie Circle Tour
Road bridges in Michigan
Road bridges in Ontario
Suspension bridges in Canada
Suspension bridges in the United States
Toll bridges in Michigan
Toll bridges in Canada
Towers in Michigan
Towers in Ontario
Transport in Windsor, Ontario
Steel bridges in the United States
Steel bridges in Canada
1929 establishments in Michigan
1929 establishments in Ontario