Rating:
3 votes

LA73 Bayou Manchac Bridge

East Baton Rouge Parish, Louisiana, and Ascension Parish, Louisiana

Photos 

Map 

Street View 

Description 

Opened to traffic in April 1931, replacing the original 1918 swing bridge. Served as part of US 61 until being bypassed by a new section of the Airline Highway in 1953.

Facts 

Overview
Pony truss bridge over Bayou Manchac on LA 73
Location
Ascension Parish, East Baton Rouge Parish, Louisiana, and Ascension Parish, Louisiana
Status
Open to traffic
History
Built 1931
Builder
- W.H. Groome & Son
Design
Polygonal Warren pony truss
Dimensions
Length of largest span: 82.0 ft.
Total length: 325.0 ft.
Deck width: 23.9 ft.
Approximate latitude, longitude
+30.34393, -90.98317   (decimal degrees)
30°20'38" N, 90°58'59" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/693864/3358620 (zone/easting/northing)
Quadrangle map:
Prairieville
Average daily traffic (as of 2015)
12,600
Inventory number
BH 19001 (Bridgehunter.com ID)
Inspection report (as of August 2017)
Overall condition: Poor
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 34.6 (out of 100)
View more at BridgeReports.com

Categories 

Ascension Parish, Louisiana (6)
Built 1931 (958)
Built during 1930s (11,986)
East Baton Rouge Parish, Louisiana (30)
Have street view (27,997)
Jefferson Highway (49)
Louisiana (727)
Open (40,432)
Owned by state (16,316)
 Polygonal Warren pony truss (390)
Polygonal Warren truss (1,103)
Pony truss (16,801)
Span length 75-100 feet (6,567)
Total length 250-500 feet (5,411)
Truss (34,676)
W.H. Groome & Son (3)
Warren truss (6,845)

Update Log 

  • March 3, 2020: Updated by Roger Collins: Added builder and description text.
  • August 1, 2013: New photos from M. D. Caillet
  • June 30, 2013: New photo from Jared Mixson
  • December 8, 2012: Updated by Jared Mixson: Added category "Jefferson Highway"
  • June 7, 2010: Updated by Cliff Darby: Refined GPS

Related Bridges 

Sources 

  • Cliff Darby - cliffsta1987 [at] gmail [dot] com
  • Jared

Comments 

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