Pontoon

Bridges that float on top of the water much like a boat but not held to the bottom of bodies of water.

Alligator River Bridge (Tyrrell County, North Carolina)
Built 1935
Bridge over Alligator River on Route 94
Replaced by a new bridge

Arkansas River Pontoon Bridge (Yell County, Arkansas)
At one time owned by the Dardanelle and Russellville Railroad, but no trains ever crossed it.
Lost Pontoon bridge over Arkansas River in Dardanelle. Once hailed as the "Longest pontoon bridge over moving water". Carried Old Military Road, a major route between Little Rock and Fort Smith.
Demolished

Black Bayou Bridge (Calcasieu Parish, Louisiana)
Built 1979
Pontoon Swing bridge over the Intracoastal Waterway on LA 384
Open to traffic

Bonner Springs Bridge (Wyandotte County, Kansas)
Built 1898; Lost in the flood of 1903
Lost Pratt through truss bridge over Kansas River
Destroyed by flooding

Brookfield Floating Bridge (Orange County, Vermont)
Built 2015
Pontoon Bridge over Sunset Lake
Open to traffic

Brookfield Floating Bridge (Older) (Orange County, Vermont)
Built 1936; reconstructed 1978; Replaced 2008
Pontoon bridge over Sunset Lake on Route 65 in Brookfield
Replaced by a new bridge

Butte Larose Pontoon Bridge (St. Martin Parish, Louisiana)
Built 1960
Pontoon lift bridge over Crocodile Bayou on Herman Dupuis Rd
Open to traffic

Camp Sherman Pontoon Bridge (Ross County, Ohio)
Built ca. 1917; Replaced 1919
Lost Pontoon bridge over Scioto River on Walkway
Replaced by a new bridge

Chamberlain Pontoon Bridge (Brule County, South Dakota)
(Main design: Bailey pony truss)
Built & removed 1953
Lost Bailey pony truss bridge over Missouri River on US16
Removed

Civil War Pontoon Bridge (Kenton County, Kentucky)
Aided troop movement during the Civil War.
Lost Pontoon bridge over Ohio River
Removed but not replaced

Cote Blanche Bridge (Lafourche Parish, Louisiana)
Built 1956
Bridge over Bayou Lafourche on W. 79th Street
Open to traffic

Del Rio Pontoon Bridge (Val Verde County, Texas)
Built 1919
Lost Pontoon bridge over Rio Grande on road
Replaced by a new bridge

Dulac Pontoon Bridge (Terrebonne Parish, Louisiana)
Built 1958
Pontoon bridge over Houma Navigation Canal on Falgout Canal Rd in Dulac
Open to traffic

Elk Springs Pontoon Bridge (McDonald County, Missouri)
Replaced 1935(?)
Lost pontoon bridge over Elk River on Elk Springs Road
Replaced by new bridge

Estherwood Bridge (Acadia Parish, Louisiana)
Built 1975
Pontoon bridge over Bayou Plaquemine Brule on LA 91 at Estherwood
Open to traffic

Evergreen Point Floating Bridge (King County, Washington)
Built 1963, replaced by new six-lane floating bridge in 2016
Pontoon bridge over Lake Washington on SR 520
Replaced by a new bridge

Galliano Pontoon Bridge (Lafourche Parish, Louisiana)
Built 1956; rehabilitated 2009
Pontoon bridge over Bayou Lafourche at Galliano
Open to traffic

Grand Lake Intracoastal Waterway Bridge (Cameron Parish, Louisiana)
Built 1964
Pontoon swing bridge over the Intracoastal Waterway on LA 384 near Grand Lake
Open to traffic

Grant Avenue Pontoon Bridge (Geary County, Kansas)
Built 1915; Replaced 1918
Pontoon bridge over Republican River on Grant Avenue

Homer M. Hadley Memorial Bridge (King County, Washington)
Built 1989
Pontoon bridge over Lake Washington on W.B. & Rev I-90
Open to traffic

Hood Canal Bridge (Kitsap County, Washington)
Built 1961, Sank 1979, Reopened 1982, East half replaced 2009
Pontoon bridge over Hood Canal on WA 104
Open to traffic

Lake Bomoseen Float Bridge (Rutland County, Vermont)
Lost Pontoon bridge over Lake Bomoseen on Float Bridge Road
Replaced by a new bridge

Larose Pontoon Bridge (Lafourche Parish, Louisiana)
Built 1953; Removed 2013
Lost Pontoon swing bridge over Bayou Lafourche on LA 310 in Larose
Demolished

Little Sioux River Pontoon Bridge (Cherokee County, Iowa)
Lost Pontoon bridge on Road
Replaced by a new bridge

Long Island Swing Bridge (Cameron County, Texas)
Bridge over Intracoastal Waterway on South Garcia Street
Open to traffic

Mathews Pontoon Bridge (Lafourche Parish, Louisiana)
Built 1963
Lost pontoon bridge on LA 364 in Mathews
Bridge removed

MILW - Chamberlain Pontoon Bridge (Brule County, South Dakota)
Built 1905; Replaced 1923
Lost Pontoon bridge over Missouri River on Chicago, Milwaukee, St. Paul & Pacific Railroad
Replaced by a new bridge

MILW - Pile-Pontoon Bridge (1874) (Clayton County, Iowa)
Built 1874; Replaced 1913
Lost Pontoon bridge over Mississippi River on Chicago, Milwaukee, St. Paul & Pacific Railroad
Replaced by a new bridge

MILW - Pile-Pontoon Bridge (1913) (Clayton County, Iowa)
Built 1913; Disassembled 1961
Lost Pontoon bridge over Mississippi River on Chicago, Milwaukee, St. Paul & Pacific Railroad
Removed

MILW - Pile-Pontoon Bridge (Prairie du Chein) (Crawford County, Wisconsin)
Built 1898 and upgraded several times; Removed 1961
Lost Pontoon bridge over Mississippi River on Chicago, Milwaukee, St. Paul & Pacific Railroad
Removed but not replaced

MILW - Reads Landing Pontoon Bridge (Wabasha County, Minnesota)
Originally built 1882; Rebuilt 1890 and 1932 due to ice jams destroying portions of the bridge; Approaches destroyed by flooding and bridge removed 1951
Lost Timber stringer bridge over Mississippi River on Chicago, Milwaukee, St. Paul & Pacific Railroad
Removed

Miner Slough Bridge (1847) (Solano County, California)
Built in 1947: remove and replaced 1966
Lost Bridge over Miner Slough on CA 84
No longer exists

Padre Island Causeway (Nueces County, Texas)
Built 1950; Replaced 1973
Lost Pontoon swing bridge over Intracoastal Waterway on Padre Island Causeway
Replaced by a new bridge

Peru Pontoon Bridge (LaSalle County, Illinois)
Built between 1855-1860 by Captain J.L. McCormick, private citizen as a toll bridge
Lost Pontoon bridge over Illinois River on Fulton Street (originally White St)
No longer exists

Pontoon Bridge (Morgan County, Alabama)
Built in 1864 for the Union Army
Lost Pontoon bridge over Tennessee River
No longer exists

Route A Pontoon Bridge (Dallas County, Missouri)
Lost Pontoon bridge on State Route A
Replaced by a new bridge

RUT - Lake Champlain Drawbridge (Addison Branch) (Addison County, Vermont)
Built 1871; Pontoon span rebuilt 1888 & 1902; Closed 1920; Abandoned 1923; Removed 1929
Lost Pontoon swing bridge over Lake Champlain on Rutland Railroad
No longer exists

SR 520 Floating Bridge (King County, Washington)
Opened in 2016
Floating bridge over Lake Washington on SR 520
Open to traffic

Sunset Beach Bridge (Brunswick County, North Carolina)
Built 1961
Pontoon Floating bridge over Intracoastal Waterway on NC 1172 in Sunset Beach
Replaced by a new bridge

Valentine Bridge (Lafourche Parish, Louisiana)
Built 1969
Swing bridge over Bayou Lafourche on Valentine Brg
Closed to traffic indefinitely