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.

When Williamson County's bridges were built

1,170 bridges with a recorded construction year, grouped by decade

bridges

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.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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 Poor
Travis County 1,544 0.2%
Williamson County (this page) 1,170 0.3%
Collin County 1,127 0.1%
Denton County 991 0.9%
Fort Bend County 795 2.5%
El Paso County 783 0.8%

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).

Similar average build year

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

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

Good-condition bridges (789)

SH 45 EB ML

Good

Over: MCNEIL RD; UPRR; DRAIN

2.30 MI E OF RM 620, Williamson, TX

Built 2006 Load: 32.7 t ADT: 21,350

SH 45 WB ML

Good

Over: MCNEIL RD; UPRR; DRAIN

2.30 MI E OF RM 620, Williamson, TX

Built 2006 Load: 32.7 t ADT: 21,350

SH 45 WB FR

Good

Over: DRAW

2.35 MI E OF RM 620, Williamson, TX

Built 2006 Load: 32.7 t ADT: 15,000

OCONNOR DRIVE

Good

Over: SH 45

1.5 MI E OF RR 620, Williamson, TX

Built 2014 Load: 32.7 t ADT: 7,000

SH 45 EBFR

Good

Over: RATTAN CREEK

1.65 MI E OF RM 620, Williamson, TX

Built 2014 Load: 32.7 t ADT: 21,350

SH45 EBFR to LP1SB

Good

Over: RATTAN CREEK

1.7 MI E OF RM 620, Williamson, TX

Built 2014 Load: 32.7 t ADT: 4,900

LP1 N/SH45 W EXIT

Good

Over: MCNEIL ROAD WEST T/A

2.1 MI W OF IH 35, Williamson, TX

Built 2014 Load: 32.7 t ADT: 70,000

SH 45 WBFR

Good

Over: RATTAN CREEK

1.6 MI E OF RM 620, Williamson, TX

Built 2014 Load: 32.7 t ADT: 10,109

SH 45 EBFR

Good

Over: DRAW

1.4 MI E OF IH 35, Williamson, TX

Built 2003 Load: 32.7 t ADT: 23,908

SH 45 WBFR

Good

Over: DRAW

1.4 MI E OF IH 35, Williamson, TX

Built 2003 Load: 32.7 t ADT: 23,217

FM 685 SB

Good

Over: BRUSHY CREEK

1.1 MI NE OF SH 130, Williamson, TX

Built 2016 Load: 32.7 t ADT: 9,838

SH 195 NB

Good

Over: CR 228

0.94 MI N OF SH 138, Williamson, TX

Built 2015 Load: 32.7 t ADT: 10,586

SH 195

Good

Over: ROCKY CREEK

1.9 MI N OF SH 138, Williamson, TX

Built 2013 Load: 32.7 t ADT: 20,871

SH 195

Good

Over: DRAW

0.9 MI N OF SH 138, Williamson, TX

Built 2015 Load: 32.7 t ADT: 20,871

FM 619

Good

Over: LITTLE DRY BRUSHY CREEK

5.90 MI S OF FM 112, Williamson, TX

Built 2006 Load: 32.7 t ADT: 461

FM 619

Good

Over: DRY BRUSHY CREEK

8.40 MI S OF FM 112, Williamson, TX

Built 2009 Load: 32.7 t ADT: 664

FM 619

Good

Over: BRUSHY CREEK

4.0 MI S OF FM 112, Williamson, TX

Built 2015 Load: 32.7 t ADT: 791

FM 1660

Good

Over: AVERY BRANCH

1.30 MI E OF FM 973, Williamson, TX

Built 1993 Load: 32.7 t ADT: 1,933

FM 973

Good

Over: BRUSHY CREEK

0.80 MI S OF FM 1660, Williamson, TX

Built 2002 Load: 32.7 t ADT: 6,992

FM 1466

Good

Over: DRAW

0.4 MI E OF SP 277, Williamson, TX

Built 2016 Load: 32.7 t ADT: 1,067

FM 970

Good

Over: SOUTH BERRY CREEK

0.2 MI E OF RM 2338, Williamson, TX

Built 2009 Load: 32.7 t ADT: 1,144

FM 487

Good

Over: N FK DONAHUE CRK

3.20 MI E OF IH 35, Williamson, TX

Built 1988 Load: 32.7 t ADT: 893

FM 487

Good

Over: DRAINAGE DITCH

0.1 Mi E of SH 195, Williamson, TX

Built 2013 Load: 32.7 t ADT: 2,790

FM 487

Good

Over: DONAHOE CREEK BRANCH

0.5 MI E OF IH 35, Williamson, TX

Built 2017 Load: 32.7 t ADT: 1,992

FM 487

Good

Over: DRAW

5.85 MI E OF IH 35, Williamson, TX

Built 2013 Load: 32.7 t ADT: 826

FM 487

Good

Over: DONAHOE CREEK TRIBUTARY

1.5 MI E OF FM 1105, Williamson, TX

Built 2013 Load: 32.7 t ADT: 1,148

FM 972

Good

Over: OPOSSUM CREEK

4.6 MI E OF IH 35, Williamson, TX

Built 2014 Load: 32.7 t ADT: 1,367

FM 971

Good

Over: SORE FINGER CREEK

5.80 MI E OF SH 95, Williamson, TX

Built 1978 Load: 32.7 t ADT: 285

FM 1063

Good

Over: TURKEY CREEK

2.8 MI N OF US 79, Williamson, TX

Built 2014 Load: 32.7 t ADT: 376

FM 1063

Good

Over: TURKEY CREEK RELIEF

2.90 MI N OF US 79, Williamson, TX

Built 2014 Load: 32.7 t ADT: 319

FM 1063

Good

Over: DRAW CREEK

3.50 MI N OF US 79, Williamson, TX

Built 2014 Load: 32.7 t ADT: 319

FM 1063

Good

Over: SPRING BRANCH

0.2 MI N OF US 79, Williamson, TX

Built 2016 Load: 32.7 t ADT: 376

FM 1431

Good

Over: BRUSHY CREEK

3.3 MI E OF US 183, Williamson, TX

Built 1986 Load: 32.7 t ADT: 37,168

FM 1431

Good

Over: CHANDLER CREEK

0.2 MI W OF IH 35, Williamson, TX

Built 1986 Load: 32.7 t ADT: 40,741

FM 3406

Good

Over: GEORGETOWN RR CO OP

0.4 MI W OF IH 35, Williamson, TX

Built 1981 Load: 32.7 t ADT: 14,670

FM 3406

Good

Over: ONION BRANCH

0.5 MI W OF IH 35, Williamson, TX

Built 1980 Load: 32.7 t ADT: 8,649

FM 1660

Good

Over: DRAW

2.6 MI W OF FM 973, Williamson, TX

Built 2019 Load: 32.7 t ADT: 2,325

Ronald Reagan Blvd

Good

Over: RM 2338

5.4 MI W OF SH 195, Williamson, TX

Built 2022 Load: 32.7 t ADT: 4,797

FM 1460

Good

Over: SOUTH FORK STONEY CREEK

0.05 MI S OF UNIVERSITY, Williamson, TX

Built 2011 Load: 32.7 t ADT: 12,379

FM 1460

Good

Over: CHANDLER BRANCH

1.3 MI N OF US 79, Williamson, TX

Built 2010 Load: 32.7 t ADT: 24,329

FM 1460 NB

Good

Over: SMITH BRANCH

1.5 MI E OF IH 35, Williamson, TX

Built 2017 Load: 32.7 t ADT: 10,673

FM 1460 SB

Good

Over: SMITH BRANCH

1.5 MI E OF IH 35, Williamson, TX

Built 2017 Load: 32.7 t ADT: 10,673

FM 973

Good

Over: BOGGY CREEK

3.6 MI S OF US 79, Williamson, TX

Built 1999 Load: 32.7 t ADT: 5,577

FM 971

Good

Over: BERRY CREEK

3.80 MI E OF BI 35 M, Williamson, TX

Built 1969 Load: 32.7 t ADT: 5,764

FM 971

Good

Over: OPOSSUM CREEK

3.80 MI W OF SH 95, Williamson, TX

Built 1993 Load: 32.7 t ADT: 1,088

LP 1 SB ML

Good

Over: FUTURE ANDERSON MILL RD

3.20 MI N OF FM 734, Williamson, TX

Built 2006 Load: 32.7 t ADT: 48,650

LP 1 NB ML

Good

Over: FUTURE ANDERSON MILL RD

3.20 MI N OF FM 734, Williamson, TX

Built 2006 Load: 32.7 t ADT: 48,650

FM 734 EB

Good

Over: LAKE CREEK

0.9 MI S OF FM 620, Williamson, TX

Built 1990 Load: 32.7 t ADT: 23,278

FM 734 WB

Good

Over: LAKE CREEK

0.9 MI S OF FM 620, Williamson, TX

Built 1990 Load: 32.7 t ADT: 23,278

FM 734 WB (PARMER)

Good

Over: SOUTH BRUSHY CREEK

2.2 MI S OF FM 1431, Williamson, TX

Built 1998 Load: 32.7 t ADT: 21,278

Read our methodology - how this data is sourced, computed, and verified.

Related

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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.