Total bridges
477
Public highway bridges in Tangipahoa County
County profile · official public datasets
Tangipahoa County, LA
477 public highway bridges tracked in the FHWA National Bridge Inventory: 40.7% rated Good, 45.9% Fair, 13.4% Poor.
- 477
- Public bridges
- 40.7%
- Good condition
- 13.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Tangipahoa 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.
- 43rd
- of 64 on Poor share
- 13.4%
- Poor-condition share
- 477
- 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.
Tangipahoa County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Tangipahoa County ranks #43 of 64 Louisiana counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 13.4%). Tangipahoa County, Louisiana contains 477 public highway bridges. Roughly 40.7% are rated “Good,” 45.9% “Fair,” and 13.4% “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
40.7%
194 of 477 rated 7-9
Fair condition
45.9%
219 of 477 rated 5-6
Poor condition
13.4%
64 of 477 rated 4 or below
In-state Poor-share rank
#43 of 64
Among Louisiana counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 477 NBI-tracked bridges by lowest applicable component rating.
Good 40.7% (194)
Fair 45.9% (219)
Poor 13.4% (64)
Tangipahoa County's Poor-condition bridges carry 103,867 vehicle crossings a day
That is 3% of the county's reported daily bridge traffic on 13.4% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,623 crossings a day against 7,438 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 477 of 477 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
49.7% of Tangipahoa County's bridges have passed the 50-year mark
237 of the 477 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 40.7% 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 15.6% of the county's Poor-condition bridge traffic
US0051 over YELLOW WATER RIVER, built 1953, carries 16,234 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 64-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 103,867 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Tangipahoa County's bridges were built
477 bridges with a recorded construction year, grouped by decade
- 1930s 17
1930–1939
17 bridges
- 1940s 1
1940–1949
1 bridges
- 1950s
1950–1959
71 bridges
- 1960s
1960–1969
98 bridges
- 1970s
1970–1979
124 bridges
- 1980s 26
1980–1989
26 bridges
- 1990s
1990–1999
61 bridges
- 2000s 37
2000–2009
37 bridges
- 2010s 35
2010–2019
35 bridges
- 2020s 7
2020–2029
7 bridges
What this shows Construction peaked in the 1970s, when 124 of the county's bridges still in the inventory were built, which is 26% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1977, 5 years older than the Louisiana average of 1982.
How Tangipahoa County compares with Louisiana's closest counties by inventory size
The 5 Louisiana counties nearest Tangipahoa County in number of bridges, with their condition splits. Its 13.4% Poor share is the 5th-lowest of these 6. Its average build year of 1977 against a peer-group mean of 1982 is 5 years older.
Showing the 5 closest of 63 Louisiana counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| East Baton Rouge County | 548 | 41.8% | 38.5% | 19.7% | 1980 |
| Rapides County | 523 | 53.3% | 39.6% | 7.1% | 1987 |
| Tangipahoa County (this page) | 477 | 40.7% | 45.9% | 13.4% | 1977 |
| Calcasieu County | 463 | 19% | 73% | 8% | 1983 |
| Orleans County | 382 | 43.7% | 46.3% | 9.9% | 1976 |
| Jefferson County | 379 | 58.6% | 36.9% | 4.5% | 1984 |
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 Tangipahoa 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 Tangipahoa County, both outside Louisiana so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside LA (477 bridges here).
- Kiowa County, OK · 477 bridges
- Johnson County, MO · 476 bridges
- Grant County, OK · 476 bridges
- Providence County, RI · 476 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 (477)
Fannie Powell Rd
PoorOver: CREEK
1.3 MI S OF JCT 440 &1057, Tangipahoa, LA
Built 1970 Load: 15.9 t ADT: 8
Kentwood Firestat
PoorOver: CANAL
LA38S.5TH.01 MI FIRESTATI, Tangipahoa, LA
Built 1995 Load: 15.9 t ADT: 70
N. River Rd
PoorOver: IRVING BRANCH
1.40 M N of LA 38, Tangipahoa, LA
Built 1975 Load: 15.9 t ADT: 141
US0051
PoorOver: YELLOW WATER RIVER
0.3 MI N OF LA 3234, Tangipahoa, LA
Built 1953 Load: 16.2 t ADT: 16,234
Sibley Rd
PoorOver: CREEK
4 MI SE OF JCT 190 &, Tangipahoa, LA
Built 1974 Load: 16.3 t ADT: 611
W. Yellow water Rd
PoorOver: CREEK
1.2 MI NW OF LA 51 E, Tangipahoa, LA
Built 1978 Load: 16.5 t ADT: 1,220
MLK Jr. Dr.
PoorOver: PONCHATOULA CREEK
1.2 MI NE OF JCT 190&1065, Tangipahoa, LA
Built 1982 Load: 17.0 t ADT: 2,010
Shingle Mill Rd
PoorOver: ANDERSON CANAL
0.3 N. OF RT. 142 MILLRD, Tangipahoa, LA
Built 1975 Load: 17.1 t ADT: 10
Lanier Ln
PoorOver: CREEK
5 MI NE OF SR 22 EXI, Tangipahoa, LA
Built 1970 Load: 17.1 t ADT: 12
Sibley Rd
PoorOver: MORAN BRANCH
4 MI SW OF 442 EXIT, Tangipahoa, LA
Built 1960 Load: 17.1 t ADT: 204
Stateline Rd
PoorOver: DRAIN
1.1 MI SE US 51 & LA 1054, Tangipahoa, LA
Built 1984 Load: 17.1 t ADT: 128
Brown Rd
PoorOver: CREEK
4.5 MI NE OF SR 22 E, Tangipahoa, LA
Built 1976 Load: 17.5 t ADT: 1,473
N. Jackson Rd
PoorOver: EVANS BR.
1.8 MI SW OF JCT 106, Tangipahoa, LA
Built 1975 Load: 17.5 t ADT: 57
Palmer Ln
PoorOver: CREEK
WEST OF BROWN LANE, Tangipahoa, LA
Built 1980 Load: 18.1 t ADT: 8
LA0022
PoorOver: BEDICO CREEK
2.6 Mi E of La 445, Tangipahoa, LA
Built 1938 Load: 19.1 t ADT: 6,775
Belle Gardner Rd
PoorOver: CATCA CREEK
2 MI SW OF JCT 16 & 450, Tangipahoa, LA
Built 1985 Load: 19.3 t ADT: 55
LA0040
PoorOver: NATALBANY RIVER
0.5 M W OF I-55, Tangipahoa, LA
Built 1971 Load: 19.8 t ADT: 913
N. Hoover Rd
PoorOver: CREEK
2.3M S OF LA 3158 EXIT, Tangipahoa, LA
Built 1993 Load: 20.4 t ADT: 4,707
Phoenix square
PoorOver: CREEK
1.4 MI SE OF RT 190, Tangipahoa, LA
Built 1975 Load: 21.6 t ADT: 5,021
LA0040
PoorOver: SCOTT CREEK
2.6 M W OF LA 1062, Tangipahoa, LA
Built 1970 Load: 21.7 t ADT: 4,748
LA1040
PoorOver: YELLOW WATER RIVER
4.7 Mi E of La 43, Tangipahoa, LA
Built 1958 Load: 22.7 t ADT: 7,190
LA0443
PoorOver: SKULLS CREEK
0.1 M N OF LA 1064, Tangipahoa, LA
Built 1954 Load: 22.7 t ADT: 6,478
Narretto Rd
PoorOver: BRUSHY BRANCH
3 MI NE OF JCT 1064, Tangipahoa, LA
Built 1975 Load: 22.7 t ADT: 359
I0055-S
PoorOver: NORTH PASS
North Pass, Tangipahoa, LA
Built 1960 Load: 23.7 t ADT: 4,107
I0055-S
PoorOver: PASS MANCHAC
Pass Manchac, Tangipahoa, LA
Built 1957 Load: 25.3 t ADT: 4,107
LA1058
PoorOver: DRAIN
0.9 M N OF LA 1059, Tangipahoa, LA
Built 1951 Load: 26.1 t ADT: 899
Harvey Lavigne
PoorOver: CREEK
1.80 M E of LA 445, Tangipahoa, LA
Built 1970 Load: 26.2 t ADT: 681
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.