Bridge conditions in Ascension Parish, Louisiana
216 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Ascension Parish has 26 bridges rated poor out of 216 inventoried, a 12.0% share that puts it well above the national rate of about 7%.
- 26 of the 216 bridges in Ascension Parish, Louisiana, are rated in poor condition (12.0%) in the 2025 National Bridge Inventory, as of .
- 90 bridges (41.7%) are rated good and 100 (46.3%) fair.
- The median Ascension Parish bridge was built in 1978.
- The busiest poor-rated bridge is LA0427 over Bayou Manchac (built 1972), carrying about 11,384 vehicles a day.
Good 41.7% · Fair 46.3% · Poor 12.0% of 216 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 |
|---|---|---|---|
| LA0427 over Bayou Manchac | 1972 | 11,384 | Poor |
| LA0431 over New River | 1982 | 9,608 | Poor |
| LA0431 over Black Bayou | 1983 | 9,608 | Poor |
| LA0431 over Villar Canal | 1971 | 9,608 | Poor |
| LA0431 over Villar Drainage | 1971 | 9,608 | Poor |
| LA0621 over Black Bayou | 1971 | 7,519 | Poor |
| LA0933 over Henderson Bayou | 1969 | 6,131 | Poor |
| LA0928 over Jim Bayou | 1966 | 5,446 | Poor |
| LA0934 over Black Bayou | 1971 | 5,367 | Poor |
| LA0935 over Black Bayou | 1974 | 4,835 | Poor |
| LA0308 over Belle Terre Canal | 1963 | 1,349 | Poor |
| Joe Sevario Rd over Sides Bayou | 1969 | 700 | Poor |
| Joe Sevario Rd over Henderson Bayou | 1969 | 700 | Poor |
| Beco Rd over Duck Roost Bayou | 1994 | 500 | Poor |
| Braud Rd over Black Bayou | 1980 | 500 | Poor |
| LA0943 over Bayou Mccall | 1972 | 350 | Poor |
| Henderson Bayou Rd over Henderson Bayou | 1990 | 300 | Poor |
| K C Rd over Bayou Narcisse | 1970 | 250 | Poor |
| Summerfield Rd over Lake Villars | 1975 | 250 | Poor |
| Summerfield Rd over Lake Villaks | 1975 | 250 | Poor |
| Devall Rd over Drainage Bayou | 1970 | 200 | Poor |
| Muddy Creek Rd over Muddy Creek | 1978 | 150 | Poor |
| Harry Savoy Rd over Drainage Bayou | 1993 | 100 | Poor |
| Pr 944 over Bayou Mccall | 1972 | 98 | Poor |
| E Lanoux Rd over New River Canal | 1994 | 25 | Poor |
| Boyce Tower Rd over Conway Bayou | 1965 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I0010 over Drain | 1975 | 60,802 | Fair |
| I0010 over La 73 | 1975 | 60,802 | Fair |
| I0010 over Drain | 1975 | 60,802 | Good |
| I0010 over Drain | 1975 | 60,802 | Good |
| I0010 over LA429/Cornerview Rd | 1975 | 60,802 | Fair |
| I0010 over Drain | 1975 | 60,802 | Good |
| I0010 over Smith Bayou | 1975 | 60,802 | Fair |
| I0010 over La 30 | 1975 | 60,802 | Fair |
| I0010 over Drain | 1975 | 60,802 | Fair |
| I0010 over Boyle Bayou | 1979 | 60,802 | Fair |
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.