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.
All bridges (215)
LA3087
FairOver: BAYOU BLUE
2 MILES EAST OF LA 182, Terrebonne, LA
Built 1988 Load: 74.5 t ADT: 13,617
DUPLANTIS BRIDGE
GoodOver: PETIT CAILLOU BAYOU
0144 LOG MI FROM IN, Terrebonne, LA
Built 1973 Load: 16.8 t ADT: 5,180
COUNTRY DR
GoodOver: BAYOU TERREBONNE
0.02 MI S. OF LA 24, Terrebonne, LA
Built 2013 Load: 18.5 t ADT: 2,390
Busnell Rd
GoodOver: Bayou Petit Gaillou
0013 LOG MI FROM INT 001, Terrebonne, LA
Built 1986 Load: 20.1 t ADT: 1,012
LA0660
GoodOver: ST LOUIS CANAL
3.0 MI NORTH OF LA 24, Terrebonne, LA
Built 1958 Load: 20.4 t ADT: 10,321
LA0182
GoodOver: ELLIOT JONES CANAL
7.07 MI EAST OF LA 20, Terrebonne, LA
Built 1952 Load: 20.9 t ADT: 3,687
LA0182
GoodOver: DRAIN CANAL
4.4 MI WEST OF LA 315, Terrebonne, LA
Built 1952 Load: 20.9 t ADT: 3,687
WESTSIDE BLVD
GoodOver: TERREBONNE BAYOU
0.1 MI. E. OF LA 24, Terrebonne, LA
Built 1974 Load: 21.4 t ADT: 5,322
US0090
GoodOver: BAYOU TERREBONNE
.2 MI EAST OF LA 24, Terrebonne, LA
Built 1980 Load: 21.4 t ADT: 2,280
Waterplant Rd
GoodOver: DEVIL SWAMP CANAL
03.15 MI FROM LA 24, Terrebonne, LA
Built 1986 Load: 21.4 t ADT: 1,958
LA0024
GoodOver: BAYOU CANE
LA0024, Terrebonne, LA
Built 1960 Load: 23.0 t ADT: 23,871
LA0024
GoodOver: TERREBONNE BAYOU
LOGMI 04.69-LA 24 SPUR, Terrebonne, LA
Built 1981 Load: 25.4 t ADT: 259
LA0024
GoodOver: BAYOU TERREBONNE
LA0024, Terrebonne, LA
Built 1974 Load: 25.9 t ADT: 312
US0090
GoodOver: BAYOU TERREBONNE
.2 MI EAST OF LA 24, Terrebonne, LA
Built 1980 Load: 26.3 t ADT: 12,192
LA0024
GoodOver: INTRACOASTAL WATERWAY
.03 MI. FROM US 90, Terrebonne, LA
Built 1996 Load: 27.2 t ADT: 29,371
LA0024
GoodOver: INTERCOASTAL WATERWAY
.03 MI EAST OF US 90, Terrebonne, LA
Built 1996 Load: 27.2 t ADT: 20,358
Texas Gulf Rd.
GoodOver: DRAIN CANAL
0.5 MI. N. OF LA 24, Terrebonne, LA
Built 2009 Load: 28.2 t ADT: 1,054
LIBERTY ST BRIDGE
GoodOver: BAYOU TERREBONNE
0.2 MI E OF LA 182, Terrebonne, LA
Built 1994 Load: 32.4 t ADT: 14,700
LA0311
GoodOver: LITTLE BAYOU BLACK
1.15 MI SOUTH OF LA 312, Terrebonne, LA
Built 1951 Load: 32.4 t ADT: 11,582
ARAGON RD
GoodOver: DRAIN CANAL
.35 MI NORTH OF LA 58, Terrebonne, LA
Built 1972 Load: 32.4 t ADT: 1,556
LA0055
GoodOver: HUMBLE CANAL
4.8 MI SOUTH OF LA 58, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 280
US0090
GoodOver: LA 662 BAYOU LOURSE
.05 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 3,007
US0090
GoodOver: DRAINAGE CANAL
1.35 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 4,014
US0090
GoodOver: DRAINAGE CANAL
1.35 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 3,007
US0090
GoodOver: CHACAHOULA BAYOU
3.35 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 4,014
US0090
GoodOver: CHACAHOULA BAYOU
3.35 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 32.7 t ADT: 3,007
US0090
GoodOver: LA 20 SP RR DRAIN CANA
RAMP TO LA 20, Terrebonne, LA
Built 1994 Load: 32.7 t ADT: 3,007
US0090
GoodOver: DEADWOOD RD TIGER BAYOU
.02 MI EAST OF LA 3052, Terrebonne, LA
Built 1994 Load: 32.7 t ADT: 3,007
HOLLYWOOD RD
GoodOver: B TERREBONNE
0.6 MI N OF LA 664, Terrebonne, LA
Built 1976 Load: 33.6 t ADT: 15,540
US0090
GoodOver: SWAMP
.09 MI EAST OF LA 3052, Terrebonne, LA
Built 1994 Load: 33.6 t ADT: 3,007
US0090
GoodOver: ONRAMP TO 90 FROM 311
0.14 MI W OF LA 311, Terrebonne, LA
Built 1987 Load: 33.6 t ADT: 12,192
US0090
GoodOver: OFFRAMP FROM 90 TO 311
0.12 MI W OF LA 311, Terrebonne, LA
Built 1987 Load: 33.6 t ADT: 12,192
US0090
GoodOver: LA 20 SP RR DRAIN CANAL
RAMP TO LA 3052, Terrebonne, LA
Built 1994 Load: 34.5 t ADT: 3,007
LA0020
GoodOver: TIGER BAYOU
0.6 MI E OF LA 182, Terrebonne, LA
Built 1984 Load: 35.0 t ADT: 2,471
LA0020
GoodOver: CANAL
1.6 M E OF LA 182, Terrebonne, LA
Built 1984 Load: 35.0 t ADT: 2,471
LA0020
GoodOver: DRAINAGE CANAL
9.3 MI E OF LA 182, Terrebonne, LA
Built 1984 Load: 35.0 t ADT: 3,696
US0090
GoodOver: TIGER BAYOU
3.95 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 35.0 t ADT: 4,014
US0090
GoodOver: SWAMP
.1 MI. FROM LA. 20, Terrebonne, LA
Built 1995 Load: 35.4 t ADT: 2,629
LA0655
GoodOver: ISLE JEAN CHARLES CANAL
8.51 MI S OF LA 55, Terrebonne, LA
Built 1988 Load: 36.3 t ADT: 2,337
SOUTHDOWN MANDALAY
GoodOver: COULEE CANAL
5 MILES WEST OF LA 316, Terrebonne, LA
Built 2007 Load: 37.3 t ADT: 1,392
THOMPSON RD
GoodOver: BAYOU PETIT CAILLOU
1.3 MI. E. OF LA 57, Terrebonne, LA
Built 2016 Load: 37.9 t ADT: 4,256
US0090
GoodOver: TIGER BAYOU
3.95 MI EAST OF LA 662, Terrebonne, LA
Built 1998 Load: 38.1 t ADT: 3,007
ST ELOI RD
GoodOver: DULARGE BAYOU
0.01 MI W OF LA 315, Terrebonne, LA
Built 2013 Load: 38.2 t ADT: 1,177
LA0664
GoodOver: BAYOU TERREBONNE
.01 MILE NORTH OF LA 24, Terrebonne, LA
Built 2011 Load: 38.6 t ADT: 5,593
LA0182
GoodOver: ST. LOUIS CANAL
0.7 MI WEST OF LA 24, Terrebonne, LA
Built 2004 Load: 38.9 t ADT: 3,687
N. BAYOU BLACK DR.
GoodOver: DONNER CANAL
1.2 MI NW OF LA.20, Terrebonne, LA
Built 2017 Load: 39.0 t ADT: 1,256
BUQUET STREET
GoodOver: BAYOU TERREBONNE
0.01 MI E OF LA 24, Terrebonne, LA
Built 2017 Load: 39.0 t ADT: 4,724
LA0024
GoodOver: B TERREBONNE / AUTIN DR.
LA0024, Terrebonne, LA
Built 1974 Load: 39.0 t ADT: 259
LA0024
GoodOver: BAYOU TERREBONNE
LA0024, Terrebonne, LA
Built 1974 Load: 39.0 t ADT: 259
LA0024
GoodOver: BAYOU TERREBONNE
LA0024, Terrebonne, LA
Built 1974 Load: 39.0 t ADT: 259
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.