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.
Good-condition bridges (194)
LA0022
GoodOver: DRAIN
3.0 M W OF I-55, Tangipahoa, LA
Built 1976 Load: 42.6 t ADT: 18,757
I0055
GoodOver: OFF RAMP US 51 MANCHAC
9.9 M S OF LA 22, Tangipahoa, LA
Built 1979 Load: 42.6 t ADT: 8,115
I0012
GoodOver: PONCHATOULA CREEK
I0010, Tangipahoa, LA
Built 1975 Load: 42.6 t ADT: 21,736
LA1064
GoodOver: LA 1064 OVER I-55
LA1064, Tangipahoa, LA
Built 1970 Load: 42.6 t ADT: 2,854
LA1040
GoodOver: NATALBANY RIVER
TANGI-LIV. PARISH LINE, Tangipahoa, LA
Built 1986 Load: 42.6 t ADT: 7,190
Vineyard Road
GoodOver: Skulls Creek
2.35 Mi. E. of La 443, Tangipahoa, LA
Built 2019 Load: 43.4 t ADT: 648
Vintrano Road
GoodOver: Ponchatoula Creek
0.5 Mi. West of US 51, Tangipahoa, LA
Built 2020 Load: 43.7 t ADT: 145
Wadesboro Rd
GoodOver: Creek
Creek, Tangipahoa, LA
Built 2023 Load: 44.4 t ADT: 1,350
JERUSALEM CHUR. RD
GoodOver: CREEK
.65 MI. E. OF LA 1249, Tangipahoa, LA
Built 2018 Load: 44.4 t ADT: 757
Randall Rd
GoodOver: Yellow Water River
0.8 Mi. Mi. N. of LA 3234, Tangipahoa, LA
Built 2020 Load: 44.4 t ADT: 2,400
US0190
GoodOver: TANGIPAHOA RIVER
1.12 MI. WEST OF LA 445, Tangipahoa, LA
Built 1969 Load: 44.5 t ADT: 9,053
I0055
GoodOver: I-55 OVER LA 16
I0055, Tangipahoa, LA
Built 1970 Load: 44.5 t ADT: 21,736
I0012
GoodOver: YELLOW WATER RIVER REL.
I0012, Tangipahoa, LA
Built 1970 Load: 44.5 t ADT: 58,377
Bankston Rd
GoodOver: LITTLE NATALBANY BRIDGE
2MI S/W OF LA 16 & US51, Tangipahoa, LA
Built 1999 Load: 45.0 t ADT: 551
I0055
GoodOver: SOUTH SLOUGH
8.9 MI N. OF PARISH LINE, Tangipahoa, LA
Built 2005 Load: 45.4 t ADT: 39,850
I0055
GoodOver: MIDDLE SLOUGH
9.8 MI N. OF PARISH LINE, Tangipahoa, LA
Built 2005 Load: 45.4 t ADT: 39,850
I0055
GoodOver: MIDDLE SLOUGH
9.8 MI N. OF PARISH LINE, Tangipahoa, LA
Built 2005 Load: 45.4 t ADT: 21,736
I0055
GoodOver: YELLOW WATER
I0055, Tangipahoa, LA
Built 1968 Load: 45.4 t ADT: 36,311
LA1054
GoodOver: DRAIN
0N LA 1054 3.3 MI N 440, Tangipahoa, LA
Built 1981 Load: 45.4 t ADT: 1,318
LA0440
GoodOver: CREEK
0.1 MILE WEST OF LA 1061, Tangipahoa, LA
Built 2013 Load: 46.3 t ADT: 752
LA1054
GoodOver: BIG CREEK
2.76 MI N OF LA 10, Tangipahoa, LA
Built 2018 Load: 46.3 t ADT: 1,159
North River Rd
GoodOver: Ashley Branch
1.4 mi. south of la 38, Tangipahoa, LA
Built 2018 Load: 46.3 t ADT: 218
I0055
GoodOver: SOUTH SLOUGH
8.9 MI N. OF PARISH LINE, Tangipahoa, LA
Built 2005 Load: 46.3 t ADT: 17,665
I0055
GoodOver: I-55 OVER US 190
I0055, Tangipahoa, LA
Built 1968 Load: 47.2 t ADT: 36,311
LA1249
GoodOver: I-12
2.1 M E OF LA 43, Tangipahoa, LA
Built 1970 Load: 47.2 t ADT: 6,110
LA0010
GoodOver: CREEK
0.7 M E OF US 51, Tangipahoa, LA
Built 1966 Load: 48.1 t ADT: 3,768
HAPPYWOODS Rd
GoodOver: I-12
0.6 M W OF I-55, Tangipahoa, LA
Built 1970 Load: 48.1 t ADT: 6,680
I0055
GoodOver: ICG RAILROAD
I0055, Tangipahoa, LA
Built 1968 Load: 49.9 t ADT: 21,736
Pate Rd
GoodOver: Selsers Creek
0.1 South of La 1067, Tangipahoa, LA
Built 2022 Load: 50.9 t ADT: 20
LA0443
GoodOver: Tangipahoa River
1.0 MI. NE of LA. 1064, Tangipahoa, LA
Built 2017 Load: 51.8 t ADT: 6,478
LA1054
GoodOver: BIG CREEK RELIEF
1.16 MI N OF LA 1061, Tangipahoa, LA
Built 2017 Load: 52.2 t ADT: 1,264
LA0442
GoodOver: TANGIPAHOA RIVER
3.45 MI. E. OF US 51, Tangipahoa, LA
Built 2019 Load: 52.2 t ADT: 1,762
LA 16
GoodOver: Tangipahoa River
1.46 Miles E. of US 51, Tangipahoa, LA
Built 2021 Load: 53.5 t ADT: 12,718
Randall Rd
GoodOver: CREEK
ON RANDALL ROAD 0.02 MILE, Tangipahoa, LA
Built 2015 Load: 54.4 t ADT: 1,933
LA1062
GoodOver: Drain
2.9 Mi. W. of La 445, Tangipahoa, LA
Built 2019 Load: 55.1 t ADT: 3,571
LA1062
GoodOver: Spring Creek
0.8 Mi W of LA 445, Tangipahoa, LA
Built 2019 Load: 55.1 t ADT: 3,571
LA1062
GoodOver: LITTLE CHAPPEPEELA CREEK
3.13 MI NE OF LA.40, Tangipahoa, LA
Built 2016 Load: 55.1 t ADT: 3,571
LA1061
GoodOver: GILL CREEK
0.8 MI. N. JCT LA 1057, Tangipahoa, LA
Built 1995 Load: 55.3 t ADT: 1,509
US0051
GoodOver: Drain
1.8 Mi N. of LA 10, Tangipahoa, LA
Built 2021 Load: 56.4 t ADT: 2,199
LA1065
GoodOver: PONCHATOULA CREEK
0.91 OF A MILE NORTH OF U, Tangipahoa, LA
Built 2015 Load: 59.3 t ADT: 5,843
LA1065
GoodOver: CREEK
0.60 MILES N OF US 190, Tangipahoa, LA
Built 2016 Load: 61.2 t ADT: 5,843
LA1054
GoodOver: DRAIN
1.7 MI. N/E LA 440 INTER., Tangipahoa, LA
Built 1995 Load: 71.3 t ADT: 1,318
Vitrano Rd
GoodOver: PONCHATOULA CREEK
ON VITRANO ROAD 0.20 MILE, Tangipahoa, LA
Built 2015 Load: 74.5 t ADT: 145
N. River Rd
GoodOver: CREEK
3.20 MILES NORTH OF LA. 1, Tangipahoa, LA
Built 2015 Load: 74.5 t ADT: 218
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.