County profile · official public datasets

Williamson County, TX

1,170 public highway bridges tracked in the FHWA National Bridge Inventory: 67.4% rated Good, 32.2% Fair, 0.3% Poor.

1,170
Public bridges: 67.4%
Good condition: 0.3%
Poor condition

The verdict

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

Williamson County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 38%
lowest Poor share in state: 0.3%
Poor-condition share: 1,170
public highway bridges: 1995
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.

Williamson County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Williamson County ranks #93 of 247 Texas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.3%). Williamson County, Texas contains 1,170 public highway bridges. Roughly 67.4% are rated “Good,” 32.2% “Fair,” and 0.3% “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

1,170

Public highway bridges in Williamson County

Good condition

67.4%

789 of 1,170 rated 7-9

Fair condition

32.2%

377 of 1,170 rated 5-6

Poor condition

0.3%

4 of 1,170 rated 4 or below

In-state Poor-share rank

#93 of 247

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

Condition distribution

Share of 1,170 NBI-tracked bridges by lowest applicable component rating.

Good

67.4% (789)

Fair

32.2% (377)

Poor

0.3% (4)

Williamson County's Poor-condition bridges carry 1,734 vehicle crossings a day

That is 0% of the county's reported daily bridge traffic on 0.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 434 crossings a day against 7,636 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 1,170 of 1,170 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

16.6% of Williamson County's bridges have passed the 50-year mark

194 of the 1,170 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 67.4% 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 70.6% of the county's Poor-condition bridge traffic

FM 619 over DRAW, built 1935, carries 1,224 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 4-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,734 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

33
1930s

17
1940s

13
1950s

51
1960s

58
1970s

39
1980s

139
1990s

149
2000s

377
2010s

221
2020s

72

What this shows Construction peaked in the 2000s, when 377 of the county's bridges still in the inventory were built, which is 32.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1995, 15 years newer than the Texas average of 1980.

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

The 5 Texas counties nearest Williamson County in number of bridges, with their condition splits. Its 0.3% Poor share is the 3rd-lowest of these 6. Its average build year of 1995 against a peer-group mean of 1993 is in line with the group.

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

Bridge inventory size and condition shares for Williamson County and the 5 Texas counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Travis County	1,544	63.9%	35.9%	0.2%	1988
Williamson County (this page)	1,170	67.4%	32.2%	0.3%	1995
Collin County	1,127	67%	32.9%	0.1%	1998
Denton County	991	57.8%	41.3%	0.9%	1994
Fort Bend County	795	72.8%	24.7%	2.5%	1998
El Paso County	783	54.4%	44.8%	0.8%	1986

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

Similar inventory size

Nearest county inventories outside TX (1,170 bridges here).

Orange County, CA · 1,164 bridges
Pima County, AZ · 1,150 bridges
Clark County, NV · 1,141 bridges
Tulsa County, OK · 1,135 bridges

Similar average build year

Nearest mean year-built outside TX (1995 here).

Craighead County, AR · avg 1995 · 442 bridges
Utah County, UT · avg 1995 · 271 bridges
DeSoto County, MS · avg 1995 · 266 bridges
Scotland County, MO · avg 1995 · 201 bridges

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

All 1,170 Good 789 Fair 377 Poor 4

Fair-condition bridges (377)

Sort:

Williamson County Bridge Snapshot

Condition distribution

Williamson County's Poor-condition bridges carry 1,734 vehicle crossings a day

16.6% of Williamson County's bridges have passed the 50-year mark

One structure carries 70.6% of the county's Poor-condition bridge traffic

How Williamson 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

Fair-condition bridges (377)

FM 971

IH 35 SB FR

SH 95

CR 419

FM 970

SH 29

US 79 SB

SH 95

BRIARCREST RD

SOUTH MAYS STREET

US 79 NB (EB)

CR 445

WESTINGHOUSE RD

US 79

SH 95

US 79 SB

US 79 NB

SH 95

SH 195 BUS

FM 487

FM 3405

Horizon Park Blvd

IH 35 NBFR

FM 619

Stadium Drive

SOUTH MAYS STREET

IH 35

CR 142 SEDBERRY RD

IH 35

IH 35 NBML

IH 35 SB ML

IH 35 SB TO SH 130

IH 35 NB

IH 35 SB

IH 35 NBML

IH 35 SB

IH 35 NBFR

IH 35 SB FR

IH 35 ML

CR 150

IH35 S T/A@ RM2338

IH 35 SBFR

IH 35 S T/A @ SH29

IH 35 N T/A @ SH29

LAKEWAY DR

IH 35

IH 35

IH 35

RM 620

IH 35

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