A bridge to nowhere is a bridge where one or both ends are broken or incomplete and does not lead anywhere. If it is an overpass or an interchange, the term overpass to nowhere or interchange to nowhere may be used respectively. There are three main origins for these bridges:
The bridge was never completed for reasons such as cost or disputed property rights.
One end or both end has collapsed or have been destroyed – e.g., by earthquake, storm, flood, or war.
The bridge is no longer used, but was not demolished because of the cost; for example, the bridges on an abandoned railway line.
Further, the term "bridge to nowhere" may be used by political opponents to describe a bridge (or proposed bridge) that serves low-population areas at high cost, a symbol of pork barrel spending.
Port Nelson Bridge, an isolated rail bridge located near Churchill, Manitoba. The connecting rail line was never finished due to labour and material shortages, a lack of financial or political support, and high cost. The envisioned port was also a poor design and was found to require excessive dredging due to significant sand bars. The project was greatly criticized by several politicians, the media (calling it a "gigantic blunder"), and even the project's chief engineer.
The Sedmpánský Bridge, an unfinished highway bridge near Hulice, Central Bohemian Region. The former highway bridge over the Sedmpánský stream between Hulice and Borovsko was under construction in 1939 – 42 and finally in 1945 – 50. The bridge was finished, however its fate was the same. Water resources in this area are now used for nearly the whole of Prague.
There are several bridges to nowhere, started to be built as a part of extraterritorial highway Vienna-Wroclaw (so called Hitler's highway), which remain unfinished and unconnected to road network.
The colloquial name for a bridge to nowhere in Germany is "Soda-Brücke" (a pun from "so da" = "just there"). Many of the bridges were built in the 1970s as part of the Autobahn network, but the oil crisis and rising environmental consciousness slowed many highway extensions.
Eintveit Bridge, a 25 metre long two-lane road bridge in Etne municipality in Hordaland county, was completed in 1962 and was intended to be part of a road on the northwestern side of Åkrafjorden. But the road was never built, and the bridge has remained unused except occasionally by hikers. In 2014 broadcaster NRK organized the "opening" of the bridge. Two cars were flown in by helicopter and then drove across the bridge.
A two-lane vehicle bridge in Pavlovsky Posad, completed in 2011, continues the minor Vachevskaya Street in the west across the Vokhna River. In the east, there is a dead end, as no vehicle road has been built there, with only a footpath branching off to another street. The bridge may become integrated into traffic once a new road tunnel under railway is completed nearby, and together they would replace a problematic level crossing. The bridge was open for vehicle traffic in July 2015.
Viaduct in Kopráš, never-used railway viaduct in the village of Kopráš near the town of Jelšava in south Slovakia. The viaduct is 120 m long and 40 m high. It was finished in 1945 but was never used, because the railway to the viaduct was never completed due to the events of World War II. Next to the viaduct are two finished tunnels without any connection to railways. The tunnel near the village of Slavošovce is 2800 m long, and the tunnel near Kopráš is 350 m long. These tunnels to nowhere were also never used, because railway construction ended in 1948 before its completion.
Bridge to Nowhere in San Martín de la Vega (built 1933), originally projected in 1926. It was severely damaged in March 1947 after severe flooding, and it was never repaired. Nowadays only a few sections of it stay in place, and the surroundings are now a recreational site.
Bewley Street Footbridge, in Colliers Wood, London, constructed in 2007 was blocked off at one end due to a dispute over the cost of building an access ramp. The ramp was finally completed in June 2015 and renamed Gam Gurung Bridge after a local councillor.
Duddeston Viaduct, a railway viaduct in Birmingham commonly known as the "Viaduct to Nowhere", built as a through route in 1846 but never used as such due to inter-company politics.
M8 Bridge to Nowhere, two separate bridges over the M8 motorway in Glasgow: one eventually had an office block constructed on it; the other, originally built in the 1970s, remained unfinished until July 2013.
Big Four Bridge (built 1895), a 770 m single-track railroad bridge over the Ohio River in Louisville, Kentucky, which was abandoned in 1968 and had both its approach spans removed and sold for scrap the following year. In February 2013, the bridge was reopened on one end for pedestrian and bicycle traffic.
Miles Glacier Bridge (built 1910), also known as the "Million Dollar Bridge", was converted from railroad use to motor vehicle use and located at the northern end of the unfinished Copper River Highway near Cordova, Alaska. Construction stopped in 1964 when an earthquake damaged the 472 m bridge. Although since repaired and reopened the bridge is nonetheless currently of limited utility due to damage along other points of the route.
Hoan Bridge (built 1973), a 3 km road bridge over the Milwaukee River in Milwaukee, Wisconsin, which was unused until access roads were completed in 1977, was lacking freeway connections at the southern end until 1998, and was "going nowhere again" for two months while closed for major repairs after a span partially collapsed in December 2000.
Luten Bridge (built 1925), also known as Mebane Bridge or Mebane's Bridge, is a road bridge over the Dan River in Rockingham County on the outskirts of the town of Eden, North Carolina, which was at the center of the landmark Luten Bridge Co. vs. Rockingham County lawsuit that made jurisprudence in 1929 when the contractor continued work on it well after the contract to build it was rescinded and subsequently sued to be reimbursed for this work.
Pier 19 (demolished 2012) of a proposed second span of the Ambassador Bridge connecting Windsor, Ontario, and Detroit, Michigan. No second span had ever been approved for this privately owned bridge, largely because the proposal would dump excessive traffic onto Windsor city surface streets, but its owners built ramps for the proposed span in an attempt to counter an internationally supported proposal for a Detroit River International Crossing to the Windsor-Essex Parkway further downriver. The unauthorized ramp was removed in 2012 by court order.
Bridges to unpopulated or low population areas
In Jasper National Park, at the outlet of Maligne Lake there is a bridge that crosses the outlet river, and proceeds about 300 meters to a parking lot and several hiking trails and a boat launch. The bridge cost millions of dollars to build and was part of a proposed route through the mountains that was never completed.
The Russky Bridge in Vladivostok was criticised as a 'bridge to nowhere', costing about one billion US dollars and serving an island where only 5,000 people live.
A four-lane vehicle overpass across the Moscow Ring Road at its 83rd kilometer (sometimes called Molokovsky Overpass) continues the Molokova Street in the Lianozovo District of Moscow outside the city. The Molokova Street is located within a gated community with only local traffic allowed; at the other end, the bridge serves only the Lianozovo Cemetery with a small parking lot next to it, coming to a dead end before a forest. As a result, the overpass only receives significant traffic on prayer for the dead days such as Saturday of Souls.
In 2014, Alaska's longest bridge was completed across the Tanana River at a cost of $187 million. Bridge consists of a 12-foot gravel path that connects a gravel spur road off the Richardson Highway near Salcha, Alaska, to the roadless Tanana Flats. The bridge will be almost exclusively for military use with limited access for hunting permit holders. Due to the current lack of infrastructure in the Tanana Flats and the ongoing uncertainty in Department of Defense spending there may be limited use of the bridge 
Ontario Highway 548 has a short stub of roadway (with double-yellow line still visible) aside of a more recent bridge approach, of which was a former ferry approach which is now used as a parking lot for people to go fishing from an island connecting the longer bridge to a shorter bridge to St. Joseph Island.