Bridge conditions in St. Tammany Parish, Louisiana
361 inventoried bridges · 18 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
18 of the 361 bridges the federal inventory lists in St. Tammany Parish are rated poor; the rest split 123 good and 220 fair.
- 18 of the 361 bridges in St. Tammany Parish, Louisiana, are rated in poor condition (5.0%) in the 2025 National Bridge Inventory, as of .
- 123 bridges (34.1%) are rated good and 220 (60.9%) fair.
- The median St. Tammany Parish bridge was built in 1975.
- The busiest poor-rated bridge is US0190 over US190B/LA21/Bouge Falaya (built 1958), carrying about 28,900 vehicles a day.
Good 34.1% · Fair 60.9% · Poor 5.0% of 361 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US0190 over US190B/LA21/Bouge Falaya | 1958 | 28,900 | Poor |
| US0011 over No&ne Railroad | 1937 | 15,607 | Poor |
| LA0059 over Long Branch Bayou | 1954 | 4,612 | Poor |
| Dixie Ranch Rd. over I-12 | 1972 | 4,450 | Poor |
| N. Wllie Rd over Drainage Ditch | 1990 | 2,255 | Poor |
| LA0036 over Abita River | 1957 | 1,844 | Poor |
| US0090 over West Pearl River | 1933 | 1,215 | Poor |
| US0090 over West Middle River | 1933 | 1,215 | Poor |
| US0090 over Middle Middle Pearl Rive | 1933 | 1,215 | Poor |
| US0090 over E Middle Pearl River | 1933 | 1,215 | Poor |
| US0090 over East Pearl River | 1934 | 1,215 | Poor |
| LA1077 over Black Bayou | 1965 | 1,019 | Poor |
| Chris Kennedy Rd over Gum Creek | 1984 | 848 | Poor |
| N. Blvd. over Canal | 1974 | 500 | Poor |
| Rousseau Rd over Tchefunete River | 1973 | 458 | Poor |
| Tiger branch over Tiger Branch | 1987 | 300 | Poor |
| Lock # 3 Rd over Creek | 1960 | 100 | Poor |
| Keller Rd over Creek | 1970 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I0010 over East Pearl River | 1966 | 87,741 | Fair |
| I0010 over La 433 | 1966 | 82,860 | Fair |
| I0010 over Canal | 1966 | 82,860 | Fair |
| I0012 over La 59 | 1976 | 80,162 | Good |
| I0012 over Ponchatolawa Creek | 1976 | 79,960 | Fair |
| I0012 over Tchefuncte River | 1975 | 79,563 | Fair |
| I0012 over US 190 | 1976 | 79,563 | Fair |
| I0012 over Bayou Lacombe | 1976 | 79,502 | Good |
| I0012 over La 21 | 1975 | 79,164 | Fair |
| I0012 over Big Branch | 1972 | 78,974 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Louisiana: Louisiana bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.