Total bridges
215
Public highway bridges in Terrebonne County
County profile · official public datasets
Terrebonne County, LA
215 public highway bridges tracked in the FHWA National Bridge Inventory: 42.3% rated Good, 47% Fair, 10.7% Poor.
- 215
- Public bridges
- 42.3%
- Good condition
- 10.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Terrebonne County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 33rd
- of 64 on Poor share
- 10.7%
- Poor-condition share
- 215
- public highway bridges
- 1983
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Terrebonne County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Terrebonne County ranks #33 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 10.7%). Terrebonne County, Louisiana contains 215 public highway bridges. Roughly 42.3% are rated “Good,” 47% “Fair,” and 10.7% “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.
Good condition
42.3%
91 of 215 rated 7-9
Fair condition
47%
101 of 215 rated 5-6
Poor condition
10.7%
23 of 215 rated 4 or below
In-state Poor-share rank
#33 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 215 NBI-tracked bridges by lowest applicable component rating.
Good 42.3% (91)
Fair 47% (101)
Poor 10.7% (23)
Terrebonne County's Poor-condition bridges carry 81,537 vehicle crossings a day
That is 8.1% of the county's reported daily bridge traffic on 10.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,545 crossings a day against 4,595 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 215 of 215 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
37.2% of Terrebonne County's bridges have passed the 50-year mark
80 of the 215 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 42.3% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
One structure carries 17.1% of the county's Poor-condition bridge traffic
N. HOLLYWOOD RD over DRAIN CANAL, built 1965, carries 13,934 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 23-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 81,537 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Terrebonne County's bridges were built
215 bridges with a recorded construction year, grouped by decade
- 1930s 2
1930–1939
2 bridges
- 1940s 3
1940–1949
3 bridges
- 1950s 14
1950–1959
14 bridges
- 1960s
1960–1969
35 bridges
- 1970s
1970–1979
42 bridges
- 1980s
1980–1989
33 bridges
- 1990s
1990–1999
53 bridges
- 2000s 9
2000–2009
9 bridges
- 2010s 21
2010–2019
21 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1990s, when 53 of the county's bridges still in the inventory were built, which is 24.7% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1983) matches the Louisiana average (1982).
How Terrebonne County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Terrebonne County in number of bridges, with their condition splits. Its 10.7% Poor share is the 2nd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1982 is in line with the group.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Beauregard County | 221 | 13.6% | 78.3% | 8.1% | 1979 |
| Winn County | 220 | 55.5% | 28.2% | 16.4% | 1987 |
| Ascension County | 216 | 41.2% | 45.8% | 13% | 1981 |
| Terrebonne County (this page) | 215 | 42.3% | 47% | 10.7% | 1983 |
| Grant County | 209 | 41.6% | 42.6% | 15.8% | 1982 |
| Richland County | 207 | 21.3% | 67.6% | 11.1% | 1979 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Terrebonne County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Terrebonne County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (215 bridges here).
- Lawrence County, AL · 215 bridges
- Idaho County, ID · 215 bridges
- Marshall County, MN · 215 bridges
- Washington County, OK · 215 bridges
Similar average build year
Nearest mean year-built outside LA (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (101)
SMITHRIDGE BRIDGE
FairOver: PETIT CAILLOU BAYOU
0001 LOG MI FROM IN, Terrebonne, LA
Built 1968 Load: 4.5 t ADT: 438
LA0182
FairOver: BAYOU BLACK
.01 MI EAST OF LA 20, Terrebonne, LA
Built 1946 Load: 10.9 t ADT: 3,687
TOUSSANT FORET BR
FairOver: PETIT CAILLOU BAYOU
0002 LOG MI FROM IN, Terrebonne, LA
Built 1965 Load: 11.7 t ADT: 1,339
SHRIMPERS ROW
FairOver: PROVOST BAYOU
4.2 MI N OF FALGOUT CANAL, Terrebonne, LA
Built 1963 Load: 11.7 t ADT: 990
DR. BEATROUS RD
FairOver: MARMANDE CANAL
0.3 MI N OF ST. ELOI RD, Terrebonne, LA
Built 1960 Load: 13.6 t ADT: 330
Bayou Gardens Blvd
FairOver: BAYOU
0.4 MI W OF LA 660, Terrebonne, LA
Built 1969 Load: 14.6 t ADT: 316
CHAUVIN BRIDGE RD
FairOver: PETIT CAILLOU BAYOU
0.02 MI SW OF LA 56, Terrebonne, LA
Built 2011 Load: 14.9 t ADT: 720
KLONDYKE BRIDGE
FairOver: TERREBONNE BAYOU
0001 LOG MI FROM INT 243, Terrebonne, LA
Built 1983 Load: 15.9 t ADT: 5,080
FALGOUT CANAL RD
FairOver: HOUMA NAVIGATION CANAL
1.0 MI W OF LA 57, Terrebonne, LA
Built 1958 Load: 16.3 t ADT: 363
SAVANNE RD
FairOver: COULEE
0544 LOG MI FROM IN, Terrebonne, LA
Built 1972 Load: 16.5 t ADT: 7,455
BULL RUN RD
FairOver: TERR LAF DRAINAGE CANAL
6.7 MI W OF LA 311, Terrebonne, LA
Built 1968 Load: 16.5 t ADT: 826
LA0182
FairOver: BAYOU TERREBONNE
.1 MI EAST OF LA 24 WEST, Terrebonne, LA
Built 1968 Load: 16.8 t ADT: 8,732
N BAYOU BLACK DR
FairOver: TERR. LAF. DRAINAGE
1.0 MI E OF SAM RAPP ST., Terrebonne, LA
Built 1966 Load: 17.5 t ADT: 1,248
LA0661
FairOver: NAVIGATION CANAL
.01 MI NORTH OF LA 315, Terrebonne, LA
Built 1962 Load: 17.8 t ADT: 10,945
RESERVATION BR
FairOver: TERREBONNE BAYOU
0.01 MI E OF LA 24, Terrebonne, LA
Built 1963 Load: 17.8 t ADT: 4,764
N BAYOU BLACK DR
FairOver: COULEE
0.9 MI SE OF DIANA ST., Terrebonne, LA
Built 1974 Load: 18.1 t ADT: 1,248
COUNTRY ESTATES DR
FairOver: ST LOUIS BAYOU
0.9 MI NORTH OF LA 660, Terrebonne, LA
Built 1967 Load: 18.1 t ADT: 7,175
LA0055
FairOver: LAPEYROUSE CANAL
8.0 MI SOUTH OF LA 58, Terrebonne, LA
Built 1959 Load: 18.5 t ADT: 276
KLONDYKE RD
FairOver: LACACHE BAYOU
0.5 MI NE OF LA 56, Terrebonne, LA
Built 1967 Load: 18.5 t ADT: 5,080
PAUL VICE BRIDGE
FairOver: DULARGE BAYOU
0001 LOG MI FROM IN, Terrebonne, LA
Built 1966 Load: 18.8 t ADT: 240
N. Hollywood Rd
FairOver: ST. LOUIS CANAL
0.8 MI E OF LA 24, Terrebonne, LA
Built 1986 Load: 18.8 t ADT: 8,236
Funderburk Ave
FairOver: BAYOU TERREBONNE
0.01 M W OF LA 24, Terrebonne, LA
Built 1965 Load: 18.8 t ADT: 5,001
DEADWOOD RD
FairOver: COULEE
0.3 MI NORTH OF LA 20, Terrebonne, LA
Built 1966 Load: 18.8 t ADT: 358
Polk St
FairOver: CANAL
0041 LOG MI FROM IN, Terrebonne, LA
Built 1965 Load: 19.1 t ADT: 6,018
Bayou Gardens Blvd
FairOver: ST. LOUIS CANAL
0.3 WEST OF LA 660, Terrebonne, LA
Built 1995 Load: 19.1 t ADT: 10,255
JARVIS BRIDGE RD
FairOver: BLACK BAYOU
0.01 MI N OF LA 182, Terrebonne, LA
Built 1968 Load: 19.1 t ADT: 130
Blanchard Rd
FairOver: BAYOU BLACK
0.01 MI N OF LA 182, Terrebonne, LA
Built 1976 Load: 19.4 t ADT: 745
Greenwood Bridge
FairOver: BAYOU BLACK
0.01 MI N OF LA 182, Terrebonne, LA
Built 1972 Load: 19.4 t ADT: 557
LA0661
FairOver: BAYOU SALLE
.2 MI EAST OF LA 57, Terrebonne, LA
Built 1961 Load: 19.8 t ADT: 5,780
LA0661
FairOver: BAYOU LACARPE
.48 MI NORTH OF LA 315, Terrebonne, LA
Built 1965 Load: 19.8 t ADT: 10,945
LA0058
FairOver: BAYOU TERREBONNE
1.58 MI EAST OF LA 56, Terrebonne, LA
Built 1964 Load: 20.1 t ADT: 5,194
BAYOUSIDE DR
FairOver: CANAL
0600 LOG MI FROM IN, Terrebonne, LA
Built 1974 Load: 20.1 t ADT: 557
BULL RUN RD
FairOver: COCKE CANAL
4.1 MI W OF LA 311, Terrebonne, LA
Built 1980 Load: 20.1 t ADT: 447
LA0024
FairOver: LITTLE CAILLOU
0.01 MI S OF LA 659, Terrebonne, LA
Built 1941 Load: 20.4 t ADT: 8,922
CHURCH ST
FairOver: BAYOU TERREBONNE
CITY OF HOUMA, Terrebonne, LA
Built 1979 Load: 20.4 t ADT: 4,110
SAVANNE RD
FairOver: OUISKI BAYOU
0374 LOG MI FROM IN, Terrebonne, LA
Built 1972 Load: 20.4 t ADT: 7,455
CIVIC CENTER BLVD
FairOver: LITTLE BLACK BAYOU
0.008 MI S OF LA 311, Terrebonne, LA
Built 1989 Load: 20.7 t ADT: 6,810
Security Blvd
FairOver: LITTLE BLACK BAYOU
0001 LOG MI FROM INT, Terrebonne, LA
Built 1979 Load: 20.7 t ADT: 468
LA0055
FairOver: ST LOUIS CANAL
.5 MI SOUTH OF LA 24, Terrebonne, LA
Built 1953 Load: 20.9 t ADT: 4,035
LA0055
FairOver: MADISON CANAL
8.8 MI SOUTH OF LA 58, Terrebonne, LA
Built 1970 Load: 21.1 t ADT: 276
ST LOUIS CANAL RD
FairOver: ST LOUIS CANAL
0166 LOG MI FROM IN, Terrebonne, LA
Built 1976 Load: 21.4 t ADT: 6,313
ST LOUIS CANAL RD
FairOver: ST LOUIS CANAL
2.3 MI N OF LA 3040, Terrebonne, LA
Built 1976 Load: 21.4 t ADT: 3,492
LA0057
FairOver: DULAC BAYOU
8 MI NORTH OF LA 56, Terrebonne, LA
Built 1971 Load: 21.7 t ADT: 952
LA0182
FairOver: CARO CANAL
.06 MI WEST OF LA 316, Terrebonne, LA
Built 1957 Load: 21.8 t ADT: 3,687
KENNY STREET
FairOver: ST LOUIS CANAL
0.2 MI E OF BROADMOOR AVE, Terrebonne, LA
Built 1976 Load: 22.4 t ADT: 1,471
PROSPECT BLVD
FairOver: DRAIN CANAL
0.6 MI S OF LA 24, Terrebonne, LA
Built 1995 Load: 22.7 t ADT: 10,390
LA0058
FairOver: PETIT CAILLOU
.01 MI EAST OF LA 56, Terrebonne, LA
Built 1964 Load: 23.3 t ADT: 5,194
WATERPROOF BRIDGE
FairOver: BLACK BAYOU
LA 182 SOUTHDOWN-MANDALAY, Terrebonne, LA
Built 2009 Load: 24.0 t ADT: 610
Savanne Rd
FairOver: BLACK BAYOU
0.01 MI NE OF LA 182, Terrebonne, LA
Built 2001 Load: 24.6 t ADT: 2,114
LA0024
FairOver: BAYOU TERREBONNE
LA0024, Terrebonne, LA
Built 1941 Load: 25.4 t ADT: 8,922
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.