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Salt Bayou Bridge


Salt Bayou Bridge (May 1929)

The first permanent bridge across Salt Bayou on what was then US 90, as it appeared shortly after its opening in May 1929.

The Times-Picayune, May 12, 1929, sec. 4, p. 1

BH Photo #467338



The first permanent bridge spanning Salt Bayou on the Old Spanish Trail (US 90) was a small draw bridge constructed between February and May 1929. A temporary pontoon bridge had been established since January 1926 so that the newly completed highway between the Rigolets and Slidell could be placed into service.

The original plans in 1925 called for a fixed timber trestle and were approved by the U.S. Department of Engineers, which declared that Salt Bayou was not a navigable stream. The resulting protests were well-publicized, spurred by a realty company looking to develop the bayou and supported by other local interests due to its popularity for recreational use. This led the Louisiana Highway Commission to alter its plans and install the steel draw bridge at greater expense.

US 90 was relocated onto its current route via Pearlington, MS in 1937, and the bridge then served as part of US 11 and US 190 for short periods until both routes were relocated in the 1940s. The route is now LA 433. The bridge itself was replaced with a fixed span in 1955 and again in 2020.


Lost Bridge over Salt Bayou on LA 433 (formerly US 90 and US 11/190)
St. Tammany Parish, Louisiana
Replaced by a new bridge
Built 1929; replaced 1955
- B.N. Davis of New Orleans, Louisiana
Approximate latitude, longitude
+30.19584, -89.75479   (decimal degrees)
30°11'45" N, 89°45'17" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/234778/3343694 (zone/easting/northing)
Inventory number
BH 88431 (Bridgehunter.com ID)


B.N. Davis (2)
Bascule (1,060)
Built 1929 (1,013)
Built during 1920s (9,922)
Lost (24,724)
Lost 1955 (87)
Lost during 1950s (676)
Louisiana (702)
Movable (2,969)
Navigable waterway (2,152)
Old Spanish Trail (19)
Owned by state (15,983)
Replaced by new bridge (16,572)
St. Tammany Parish, Louisiana (45)
US 11 (44)
US 190 (19)
US 90 (71)

Update Log 

  • March 5, 2020: New photo from Douglas Butler
  • March 5, 2020: New photo from Roger Collins


  • Douglas Butler