County profile · official public datasets

Trinity County, TX

81 public highway bridges tracked in the FHWA National Bridge Inventory: 55.6% rated Good, 40.7% Fair, 3.7% Poor.

81
Public bridges: 55.6%
Good condition: 3.7%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Trinity 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.

224th
of 247 on Poor share: 3.7%
Poor-condition share: 81
public highway bridges: 1975
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.

Trinity County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Trinity County ranks #224 of 247 Texas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.7%). Trinity County, Texas contains 81 public highway bridges. Roughly 55.6% are rated “Good,” 40.7% “Fair,” and 3.7% “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.

Total bridges

Public highway bridges in Trinity County

Good condition

55.6%

45 of 81 rated 7-9

Fair condition

40.7%

33 of 81 rated 5-6

Poor condition

3.7%

3 of 81 rated 4 or below

In-state Poor-share rank

#224 of 247

Among Texas counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 81 NBI-tracked bridges by lowest applicable component rating.

Good

55.6% (45)

Fair

40.7% (33)

Poor

3.7% (3)

Trinity County's Poor-condition bridges carry 210 vehicle crossings a day

That is 0.2% of the county's reported daily bridge traffic on 3.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 70 crossings a day against 1,421 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 81 of 81 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48.1% of Trinity County's bridges have passed the 50-year mark

39 of the 81 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 55.6% 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 47.6% of the county's Poor-condition bridge traffic

ELMER SMITH RD over MOSSY CREEK, built 1988, carries 100 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 3-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 210 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

5
1930s

4
1940s

1
1950s

16
1960s

10
1970s

7
1980s

8
1990s

14
2000s

8
2010s

8

What this shows Construction peaked in the 1950s, when 16 of the county's bridges still in the inventory were built, which is 19.8% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1975, 5 years older than the Texas average of 1980.

How Trinity County compares with Texas's closest counties by inventory size

The 5 Texas counties nearest Trinity County in number of bridges, with their condition splits. Its 3.7% Poor share is the 5th-lowest of these 6. Its average build year of 1975 against a peer-group mean of 1963 is 12 years newer.

Showing the 5 closest of 246 Texas counties eligible for comparison.

Bridge inventory size and condition shares for Trinity County and the 5 Texas counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Llano County	84	40.5%	59.5%	0%	1953
Hood County	83	47%	51.8%	1.2%	1974
Trinity County (this page)	81	55.6%	40.7%	3.7%	1975
Cottle County	80	31.3%	67.5%	1.3%	1960
Haskell County	80	46.3%	52.5%	1.3%	1958
Gray County	79	29.1%	65.8%	5.1%	1968

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 Trinity 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 Trinity County, both outside Texas so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside TX (81 bridges here).

Berrien County, GA · 81 bridges
Fayette County, GA · 81 bridges
Sumter County, GA · 81 bridges
White County, GA · 81 bridges

Similar average build year

Nearest mean year-built outside TX (1975 here).

San Bernardino County, CA · avg 1975 · 1,422 bridges
Lane County, OR · avg 1975 · 1,010 bridges
Fulton County, GA · avg 1975 · 775 bridges
Westmoreland County, PA · avg 1975 · 620 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 81 Good 45 Fair 33 Poor 3

Good-condition bridges (45)

Sort:

Trinity County Bridge Snapshot

Condition distribution

Trinity County's Poor-condition bridges carry 210 vehicle crossings a day

48.1% of Trinity County's bridges have passed the 50-year mark

One structure carries 47.6% of the county's Poor-condition bridge traffic

How Trinity County compares with Texas's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (45)

STREAM

SH 19

SH 94

SH 94

US 287

FM 230

FM 1280

FM 357

FM 358

FM 2262

FM 2912

FM 3154

GRVTN-FLAT PRAIRIE

WESTVILLE ROAD

FM 2262

SH 94

SH 94

SH 94

FM 1617

LACY ROAD 4

SH 19

SH 19 NB

SH 94

SH 94

SH 94

SH 94

FM 357

FM 358

FM 358

FM 2501

GLENDALE-HOLLY RD

ROSSER LANE

CEDAR ROAD

HELMIC ROAD

PINEY CREEK RD

PORT BLVD

FM 3188

TRINLADY PARK ROAD

SH 19

SH 19

FM 1280

FM 2262

GLENDALE-HOLLY RD

DUKES ROAD

FDR 568

Related