St. Tammany County, LA
360 public highway bridges
St. Tammany County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, St. Tammany County, Louisiana contains 360 public highway bridges. Roughly 29.7% are rated “Good,” 53.1% “Fair,” and 5.6% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Condition Distribution
All Bridges (360)
LA0059
PoorOver: LONG BRANCH BAYOU
0.5 M N OF LA 36, St. Tammany, LA
Keller Rd
PoorOver: CREEK
0.3MI.N.OF 9TH STREE, St. Tammany, LA
US0011
PoorOver: NO&NE RAILROAD
1.05 MI S OF I-12 EB, St. Tammany, LA
Tiger branch
PoorOver: BR. OVER TIGER BRANCH
1.40 EAST OF LA 25, St. Tammany, LA
CHRIS KENNEDY RD
PoorOver: GUM CREEK
1.32 MI. SOUTH OF LA 41, St. Tammany, LA
LA0036
PoorOver: ABITA RIVER
0.1 M E OF LA 59, St. Tammany, LA
Rousseau Rd
PoorOver: TCHEFUNETE RIVER
0.45 MILES NORTH OF LA.10, St. Tammany, LA
N. Blvd.
PoorOver: CANAL
1.0 MILE SOUTH OF I 12 OF, St. Tammany, LA
US0090
PoorOver: WEST PEARL RIVER
US0090, St. Tammany, LA
N. Wllie Rd
PoorOver: DRAINAGE DITCH
2.2 M NORTH OF LA 1077, St. Tammany, LA
Read our methodology - how this data is sourced, computed, and verified.
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Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.