Total bridges
209
Public highway bridges in Grant County
County profile · official public datasets
Grant County, LA
209 public highway bridges tracked in the FHWA National Bridge Inventory: 41.6% rated Good, 42.6% Fair, 15.8% Poor.
- 209
- Public bridges
- 41.6%
- Good condition
- 15.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Grant County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 49th
- of 64 on Poor share
- 15.8%
- Poor-condition share
- 209
- public highway bridges
- 1982
- 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.
Grant County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Grant County ranks #49 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 15.8%). Grant County, Louisiana contains 209 public highway bridges. Roughly 41.6% are rated “Good,” 42.6% “Fair,” and 15.8% “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
41.6%
87 of 209 rated 7-9
Fair condition
42.6%
89 of 209 rated 5-6
Poor condition
15.8%
33 of 209 rated 4 or below
In-state Poor-share rank
#49 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 209 NBI-tracked bridges by lowest applicable component rating.
Good 41.6% (87)
Fair 42.6% (89)
Poor 15.8% (33)
Grant County's Poor-condition bridges carry 40,994 vehicle crossings a day
That is 14.9% of the county's reported daily bridge traffic on 15.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,242 crossings a day against 1,352 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 209 of 209 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
40.2% of Grant County's bridges have passed the 50-year mark
84 of the 209 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 41.6% 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 28.6% of the county's Poor-condition bridge traffic
US0167 over MOSLEY MILL CREEK, built 1975, carries 11,712 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 33-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 40,994 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Grant County's bridges were built
209 bridges with a recorded construction year, grouped by decade
- 1910s 1
1910–1919
1 bridges
- 1930s 12
1930–1939
12 bridges
- 1940s 5
1940–1949
5 bridges
- 1950s 15
1950–1959
15 bridges
- 1960s
1960–1969
35 bridges
- 1970s
1970–1979
21 bridges
- 1980s
1980–1989
35 bridges
- 1990s
1990–1999
30 bridges
- 2000s
2000–2009
38 bridges
- 2010s 13
2010–2019
13 bridges
- 2020s 4
2020–2029
4 bridges
What this shows Construction peaked in the 2000s, when 38 of the county's bridges still in the inventory were built, which is 18.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1982) matches the Louisiana average (1982).
How Grant County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Grant County in number of bridges, with their condition splits. Its 15.8% Poor share is the 5th-lowest of these 6. Its average build year of 1982 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 |
|---|---|---|---|---|---|
| Winn County | 220 | 55.5% | 28.2% | 16.4% | 1987 |
| Ascension County | 216 | 41.2% | 45.8% | 13% | 1981 |
| Terrebonne County | 215 | 42.3% | 47% | 10.7% | 1983 |
| Grant County (this page) | 209 | 41.6% | 42.6% | 15.8% | 1982 |
| Richland County | 207 | 21.3% | 67.6% | 11.1% | 1979 |
| De Soto County | 201 | 27.9% | 67.2% | 5% | 1980 |
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 Grant 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 Grant County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (209 bridges here).
- McDonough County, IL · 209 bridges
- Clinton County, OH · 209 bridges
- Iowa County, WI · 209 bridges
- Fulton County, IL · 210 bridges
Similar average build year
Nearest mean year-built outside LA (1982 here).
- Oklahoma County, OK · avg 1982 · 1,216 bridges
- Jackson County, MO · avg 1982 · 930 bridges
- Milwaukee County, WI · avg 1982 · 893 bridges
- Champaign County, IL · avg 1982 · 727 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (87)
LA1240
GoodOver: LAPET CREEK
3.57 MI. N OF US 71, Grant, LA
Built 2003 Load: 39.0 t ADT: 229
LA1240
GoodOver: FOUCHMIAH CREEK
5.66 MI. N OF US 71, Grant, LA
Built 2003 Load: 39.0 t ADT: 229
Lemoine Cutoff Rd
GoodOver: VALENTINE BAYOU
0.32 MILES N JCT US 71, Grant, LA
Built 2009 Load: 39.5 t ADT: 36
US0167
GoodOver: BEAR CREEK
0.76 MI. SOUTH OF LA 500, Grant, LA
Built 2010 Load: 39.9 t ADT: 7,084
LA0122
GoodOver: PARASOL BAYOU
2.12 M E OF E JCT LA 471, Grant, LA
Built 1988 Load: 39.9 t ADT: 683
Hudson Creek Rd
GoodOver: HUDSON CREEK
0.69 M. N. OF JCT US 71, Grant, LA
Built 2005 Load: 40.5 t ADT: 350
LA0492
GoodOver: BAYOU RIGOLETTE
0.96 MI. WEST OF US 71, Grant, LA
Built 1999 Load: 40.8 t ADT: 570
LA0492
GoodOver: BAYOU DARROW
2.12 MI. WEST OF US 71, Grant, LA
Built 1999 Load: 40.8 t ADT: 570
LA0500
GoodOver: LITTLE BEAR & RATTON CR.
5.34 MI. EAST OF US 167, Grant, LA
Built 1998 Load: 40.8 t ADT: 620
LA0500
GoodOver: LOCK BRANCH
2.9 MI EAST OF LA 472, Grant, LA
Built 1998 Load: 40.8 t ADT: 620
LA0122
GoodOver: NANTACHIE CREEK
1.44 MI. EAST OF US 71, Grant, LA
Built 1982 Load: 40.8 t ADT: 683
LA0122
GoodOver: NANTACHIE CREEK RELIEF
1.55 MI. EAST OF US 71, Grant, LA
Built 1982 Load: 40.8 t ADT: 683
LA0122
GoodOver: DARTIGO CREEK
8.52 MI. EAST OF US 71, Grant, LA
Built 1993 Load: 40.8 t ADT: 683
LA0122
GoodOver: HURLEY CREEK
6.58 M E OF E JCT LA 471, Grant, LA
Built 2000 Load: 41.7 t ADT: 683
LA0122
GoodOver: IATT CREEK
6.76 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 41.7 t ADT: 683
LA0122
GoodOver: BLACK CREEK
8.94 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 41.7 t ADT: 683
LA0122
GoodOver: BLACK CREEK RELIEF
9.04 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 41.7 t ADT: 683
FARENZIE RD
GoodOver: SUGARHOUSE BAYOU
0.16 MI. NORTH OF LA 8, Grant, LA
Built 2006 Load: 42.1 t ADT: 350
US0167
GoodOver: BIG CREEK
1.07 MI. SOUTH OF LA 123, Grant, LA
Built 1988 Load: 43.5 t ADT: 11,712
US0071
GoodOver: NANTACHIE CREEK
0.25 MI NE JCT LA 1240, Grant, LA
Built 1983 Load: 44.5 t ADT: 1,388
LA0122
GoodOver: SWAFFORD CREEK
11.21 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 44.5 t ADT: 683
Lemoine Cutoff Rd
GoodOver: CREEK
1.39 M. N. OF US 71, Grant, LA
Built 1993 Load: 45.7 t ADT: 320
Rock Hill Road
GoodOver: Grays Creek
5.72 MI N of Jct US 71, Grant, LA
Built 2017 Load: 46.0 t ADT: 130
LA0471
GoodOver: Dartigo Creek
5.8 Mi N of US 71, Grant, LA
Built 2021 Load: 46.3 t ADT: 510
LA0471
GoodOver: Dartigo Creek
5.88 M N of US 71, Grant, LA
Built 2021 Load: 46.3 t ADT: 510
LA0471
GoodOver: Creek
6.02 M N of US 71, Grant, LA
Built 2021 Load: 46.3 t ADT: 510
US0165
GoodOver: OLD SLOUGH
0.63 MILES NORTH OF LA 8, Grant, LA
Built 2006 Load: 46.3 t ADT: 6,586
LA0122
GoodOver: UNNAMED CREEK
7.99. M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 47.2 t ADT: 683
LA0122
GoodOver: BEAVER CREEK
3.38 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 47.2 t ADT: 683
Douglas Rd
GoodOver: SWAFFORD CREEK
0.51 MILES WEST OF NEWTON, Grant, LA
Built 2013 Load: 47.6 t ADT: 100
LA0122
GoodOver: CREEK
4.9 Mi E of LA 471, Grant, LA
Built 2023 Load: 56.1 t ADT: 683
Air Base Rd
GoodOver: CREEK
0.25 MI. EAST OF US 167, Grant, LA
Built 2005 Load: 74.5 t ADT: 138
Air Base Rd
GoodOver: CREEK
.42 MILES EAST OF US 167, Grant, LA
Built 2005 Load: 74.5 t ADT: 138
Nelms Loop Rd
GoodOver: DRY BRANCH
.87 MILES E US 71, Grant, LA
Built 2009 Load: 74.5 t ADT: 200
LA0122
GoodOver: DRAIN
10.9 M E OF E JCT LA 471, Grant, LA
Built 1999 Load: 74.5 t ADT: 683
Rob Wallace Rd
GoodOver: CREEK
0.64 MI. NORTH OF LA 8, Grant, LA
Built 1993 Load: 74.5 t ADT: 50
River Rd
GoodOver: UNNAMED CREEK
2.21 MI. WEST OF US 71, Grant, LA
Built 2003 Load: 74.5 t ADT: 100
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.