Total bridges
121
Public highway bridges in Union County
County profile · official public datasets
Union County, LA
121 public highway bridges tracked in the FHWA National Bridge Inventory: 21.5% rated Good, 66.9% Fair, 11.6% Poor.
- 121
- Public bridges
- 21.5%
- Good condition
- 11.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Union County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 37th
- of 64 on Poor share
- 11.6%
- Poor-condition share
- 121
- public highway bridges
- 1977
- 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.
Union County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Union County ranks #37 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 11.6%). Union County, Louisiana contains 121 public highway bridges. Roughly 21.5% are rated “Good,” 66.9% “Fair,” and 11.6% “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
21.5%
26 of 121 rated 7-9
Fair condition
66.9%
81 of 121 rated 5-6
Poor condition
11.6%
14 of 121 rated 4 or below
In-state Poor-share rank
#37 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 121 NBI-tracked bridges by lowest applicable component rating.
Good 21.5% (26)
Fair 66.9% (81)
Poor 11.6% (14)
Union County's Poor-condition bridges carry 16,163 vehicle crossings a day
That is 7.4% of the county's reported daily bridge traffic on 11.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,155 crossings a day against 866 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 120 of 121 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
42.1% of Union County's bridges have passed the 50-year mark
51 of the 121 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 21.5% 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 38.6% of the county's Poor-condition bridge traffic
LA0002 over CREEK, built 1931, carries 6,236 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 14-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 16,163 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Union County's bridges were built
121 bridges with a recorded construction year, grouped by decade
- 1920s 2
1920–1929
2 bridges
- 1930s 8
1930–1939
8 bridges
- 1950s
1950–1959
25 bridges
- 1960s 8
1960–1969
8 bridges
- 1970s
1970–1979
16 bridges
- 1980s
1980–1989
18 bridges
- 1990s
1990–1999
19 bridges
- 2000s
2000–2009
13 bridges
- 2010s
2010–2019
11 bridges
- 2020s 1
2020–2029
1 bridges
What this shows Construction peaked in the 1950s, when 25 of the county's bridges still in the inventory were built, which is 20.7% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1977, 5 years older than the Louisiana average of 1982.
How Union County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Union County in number of bridges, with their condition splits. Its 11.6% Poor share is the 5th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1981 is in line with the group.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Franklin County | 131 | 64.9% | 32.1% | 3.1% | 1989 |
| Lafourche County | 130 | 39.2% | 44.6% | 16.2% | 1981 |
| Caldwell County | 124 | 57.3% | 34.7% | 8.1% | 1982 |
| St. Mary County | 124 | 31.5% | 62.1% | 6.5% | 1975 |
| Union County (this page) | 121 | 21.5% | 66.9% | 11.6% | 1977 |
| St. Martin County | 116 | 37.9% | 53.4% | 8.6% | 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 Union 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 Union County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (121 bridges here).
- Sutter County, CA · 121 bridges
- Gadsden County, FL · 121 bridges
- Emanuel County, GA · 121 bridges
- Montcalm County, MI · 121 bridges
Similar average build year
Nearest mean year-built outside LA (1977 here).
- San Diego County, CA · avg 1977 · 1,632 bridges
- King County, WA · avg 1977 · 1,238 bridges
- Riverside County, CA · avg 1977 · 1,117 bridges
- Shelby County, TN · avg 1977 · 1,077 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (121)
LA0550
FairOver: CREEK
2.1 MI NORTH OF LA 15, Union, LA
Built 1957 Load: 17.1 t ADT: 464
LA0550
FairOver: CREEK
4.09 MI NORTH OF LA 15, Union, LA
Built 1936 Load: 18.1 t ADT: 464
LITTLE LOUTRE RD
FairOver: LITTLE BAYOU DELOUTRE
1.3 MI W of LA 549, Union, LA
Built 1994 Load: 18.1 t
SPEARSVILLE RD
FairOver: TEN MILE CREEK
2.5 MI. NW INT. 144, Union, LA
Built 1983 Load: 18.5 t ADT: 210
US0167
FairOver: MIDDLE FORK SLOUGH
1.5 MI SOUTH OF SOUTH INT, Union, LA
Built 1952 Load: 19.1 t ADT: 422
US0167
FairOver: MIDDLE FORK REL
1.8 MI SOUTH OF SOUTH INT, Union, LA
Built 1952 Load: 19.1 t ADT: 422
US0167
FairOver: LILLIE BRANCH
1.4 MI NORTH OF LA 15, Union, LA
Built 1952 Load: 19.1 t ADT: 422
LA0015
FairOver: ONEMILE CREEK
1.0 MI NORTH OF LA 33, Union, LA
Built 1953 Load: 20.0 t ADT: 8,290
LA0550
FairOver: CYPRESS CREEK
.14 MI NORTH OF LA 15, Union, LA
Built 1957 Load: 20.4 t ADT: 464
US0167
FairOver: CORNEY BAYOU REL
2.0 MI SOUTH OF LA 15, Union, LA
Built 1952 Load: 20.9 t ADT: 422
US0167
FairOver: NORTH SLOUGH
1.5 MI SOUTH OF LA 15, Union, LA
Built 1952 Load: 20.9 t ADT: 422
SWEET LILY RD
FairOver: LITTLE CANE CREEK
1.8 MI. N. INT. 258, Union, LA
Built 1978 Load: 21.6 t ADT: 10
LA0002
FairOver: FOURMILE CREEK
1.8 MI WEST OF LA 15, Union, LA
Built 1964 Load: 22.7 t ADT: 11,805
LA0550
FairOver: CREEK
3.8 MI NORTH OF LA 2, Union, LA
Built 1971 Load: 23.6 t ADT: 464
CROW FARM RD
FairOver: GLAZE CREEK
5.7 M EAST INT 800, Union, LA
Built 1990 Load: 24.3 t ADT: 201
US0167
FairOver: MIDDLE SLOUGH
1.7 MI SOUTH OF LA 15, Union, LA
Built 1952 Load: 24.6 t ADT: 422
LA0550
FairOver: CAMP CREEK
8.5 MI NORTH OF LA 2, Union, LA
Built 1956 Load: 25.4 t ADT: 464
US0167
FairOver: MIDDLE FORK BAYOU
1.4 MI SOUTH OF SOUTH INT, Union, LA
Built 1952 Load: 25.6 t ADT: 422
LA0550
FairOver: CREEK
7.5 MI NORTH OF LA 2, Union, LA
Built 1956 Load: 26.1 t ADT: 464
GREEN BRIDGE RD
FairOver: BAYOU DE LOUTRE
6 MI E OF SPEARSVILL, Union, LA
Built 1984 Load: 26.9 t ADT: 99
LA0002
FairOver: MILL CREEK
.9 MI WEST OF LA 15, Union, LA
Built 1964 Load: 27.2 t ADT: 11,805
PILGRIM REST CH RD
FairOver: MILL CREEK
5.8 MI. NW INT. 209, Union, LA
Built 1984 Load: 28.2 t ADT: 366
LA0002
FairOver: LYNN CREEK
3.8 MI WEST OF US 167, Union, LA
Built 1950 Load: 29.0 t ADT: 886
LA0143
FairOver: COOK CREEK
2.5 MI NORTH OF LA 2, Union, LA
Built 1951 Load: 29.0 t ADT: 2,254
US0167
FairOver: CREEK
1.7 MI NORTH OF ALT LA 2, Union, LA
Built 1924 Load: 32.4 t ADT: 422
US0167
FairOver: CREEK
5.3 MI NORTH OF LA 15, Union, LA
Built 1925 Load: 32.4 t ADT: 422
LA0033
FairOver: CREEK
2.5 MI NORTH OF LA 151, Union, LA
Built 1937 Load: 32.4 t ADT: 5,013
LA0033
FairOver: CREEK
3.5 MI NORTH OF LA 151, Union, LA
Built 1937 Load: 32.4 t ADT: 5,862
LA0002
FairOver: CREEK
3.0 MI WEST OF US 167, Union, LA
Built 1950 Load: 32.4 t ADT: 886
LA0002
FairOver: CREEK
6.7 MI EAST OF LA 550, Union, LA
Built 1975 Load: 32.4 t ADT: 2,579
LA0002
FairOver: CREEK
2.6 MI EAST OF LA 33, Union, LA
Built 1931 Load: 32.4 t ADT: 6,218
LA0002
FairOver: HORSE.PEN CREEK
5.6 MI EAST OF LA 33, Union, LA
Built 1931 Load: 32.4 t ADT: 6,236
LA0002
FairOver: CREEK
3.6 MI EAST OF LA 143, Union, LA
Built 1931 Load: 32.4 t ADT: 6,258
LA0015
FairOver: HUNNICUTT CREEK
1.3 MI NORTH OF LA 549, Union, LA
Built 1953 Load: 32.4 t ADT: 5,557
LA0015
FairOver: CREEK
4.4 MI NORTH OF LA 549, Union, LA
Built 1953 Load: 32.4 t ADT: 5,557
LA0015
FairOver: HORSE TROUGH CREEK
6.2 MI NORTH OF LA 549, Union, LA
Built 1955 Load: 32.4 t ADT: 5,557
LA0015
FairOver: CYPRESS CREEK
8.2 MI NORTH OF LA 549, Union, LA
Built 1955 Load: 32.4 t ADT: 5,557
LA0015
FairOver: CAMP CREEK
3.0 MI NORTH OF LA 550, Union, LA
Built 1955 Load: 32.4 t ADT: 2,423
LA0143
FairOver: HOLLMAN CREEK
4.8 MI NORTH OF LA 2, Union, LA
Built 1951 Load: 32.4 t ADT: 2,254
LA0015
FairOver: CREEK
1.0 MI NORTH OF LA 552, Union, LA
Built 1997 Load: 32.4 t ADT: 6,512
US0167
FairOver: BIG CORNEY BAYOU
2.2 MI SOUTH OF LA 15, Union, LA
Built 1952 Load: 32.7 t ADT: 422
GARLAND GIN RD
FairOver: MILL CREEK
.3 MI. NE INT. 426, Union, LA
Built 1983 Load: 33.0 t ADT: 1,077
ALLEN MANN RD
FairOver: DRAIN TO DARBONNE LAKE
.7 MI. SE INT. 343, Union, LA
Built 1983 Load: 33.0 t ADT: 317
STANSBURY RD
FairOver: DRAIN TO DARBONNE LAKE
1.1 MI. N. INT. 269, Union, LA
Built 1983 Load: 33.0 t ADT: 201
OAKLAND BRIDGE RD
FairOver: BAYOU DELOUTRE
3.0 MI E of LA 558, Union, LA
Built 2004 Load: 33.4 t ADT: 324
LA0033
FairOver: BAYOU DELOUTRE
7.1 MI N of LA 2/LA 15, Union, LA
Built 1997 Load: 34.3 t ADT: 1,697
LA0033
FairOver: BIG CREEK
0.04 MI. EAST OF LA 551, Union, LA
Built 2011 Load: 35.0 t ADT: 2,603
OAKLAND BRIDGE RD
FairOver: LION CREEK
0.5 MI W of LA 550, Union, LA
Built 2003 Load: 35.0 t ADT: 324
LA0015
FairOver: LITTLE CORNEY BAYOU
2.0 MI WEST OF LA 3121, Union, LA
Built 1978 Load: 35.4 t ADT: 838
US0167
FairOver: MIDDLE FORK BAYOU
2.0 MI. NORTH OF LA 545, Union, LA
Built 2012 Load: 36.0 t ADT: 422
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.