Total bridges
1,170
Public highway bridges in Williamson County
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.
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
- 1910s 1
1910–1919
1 bridges
- 1920s 33
1920–1929
33 bridges
- 1930s 17
1930–1939
17 bridges
- 1940s 13
1940–1949
13 bridges
- 1950s 51
1950–1959
51 bridges
- 1960s 58
1960–1969
58 bridges
- 1970s 39
1970–1979
39 bridges
- 1980s 139
1980–1989
139 bridges
- 1990s 149
1990–1999
149 bridges
- 2000s
2000–2009
377 bridges
- 2010s
2010–2019
221 bridges
- 2020s 72
2020–2029
72 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.
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.
| 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.
Fair-condition bridges (377)
S BAGDAD RD
FairOver: S FORK BRUSHY CREEK
2.90 MI N OF CEDAR PARK, Williamson, TX
Built 2004 Load: 32.7 t ADT: 9,310
Wagongap Dr
FairOver: Drainage Ditch
0.5 Mi N of Hesters Xing, Williamson, TX
Built 1990 Load: 32.7 t ADT: 200
CR 120
FairOver: WEIR BRANCH
0.30 MI S OF FM 971, Williamson, TX
Built 2006 Load: 32.7 t ADT: 1,050
183A NB ENT RAMP
FairOver: 183A NB EXIT RAMP
1.2 MI N OF SH 45, Williamson, TX
Built 2007 Load: 32.7 t ADT: 7,155
183A NB ML
FairOver: SOUTH BRUSHY CREEK
2.1 MI N OF SH 45, Williamson, TX
Built 2007 Load: 32.7 t ADT: 26,850
183A SB ML
FairOver: BRUSHY CRK RD & A&NW RR
2.7 MI N OF SH 45, Williamson, TX
Built 2007 Load: 32.7 t ADT: 48,824
US 183A SBML
FairOver: SPANISH OAK CR TRIB
3.8 MI N OF SH 45, Williamson, TX
Built 2007 Load: 32.7 t ADT: 14,320
183A NB ML
FairOver: SPANISH OAK CR TRIB
3.8 MI N OF SH 45, Williamson, TX
Built 2007 Load: 32.7 t ADT: 26,850
CR 327
FairOver: WILLIS CREEK
0.20 MI W OF CR 381, Williamson, TX
Built 1987 Load: 33.6 t ADT: 70
CR 339
FairOver: N PECAN BRANCH
0.90 MI S FM 971, Williamson, TX
Built 1989 Load: 33.6 t ADT: 100
CR 317
FairOver: OPOSSUM CREEK
1.70 MI NW OF FM 1105, Williamson, TX
Built 1991 Load: 35.4 t ADT: 80
US 79 NB
FairOver: BU 79
3.45 MI E OF FM 973, Williamson, TX
Built 1972 Load: 36.3 t ADT: 3,375
CR 421
FairOver: TURKEY CREEK
2.10 MI N OF US 79, Williamson, TX
Built 1986 Load: 36.3 t ADT: 181
CR 106
FairOver: MANKINS BRANCH
0.40 MI S OF SH 29, Williamson, TX
Built 1925 Load: 36.3 t ADT: 280
US 79 SB
FairOver: BU 79
3.45 MI E OF FM 973, Williamson, TX
Built 1972 Load: 37.2 t ADT: 3,375
IH 35 NB
FairOver: SS 26 & UP RR
0.9 MI S OF FM 2243, Williamson, TX
Built 1965 Load: 38.1 t ADT: 64,514
IH 35 SB
FairOver: SS 26 & UP RR
0.9 MI S OF FM 2243, Williamson, TX
Built 1965 Load: 38.1 t ADT: 62,712
EST OF BRUSHY CRK
FairOver: HUTTO DRAW
0.65 MI W OF FM 1660, Williamson, TX
Built 1995 Load: 39.0 t ADT: 100
SH 95
FairOver: BULL BRANCH
0.60 MI N OF BU 79, Williamson, TX
Built 1941 Load: 40.8 t ADT: 15,130
SH 130 SB ML
FairOver: CR 152
0.90 MI S OF IH 35, Williamson, TX
Built 2006 Load: 40.8 t ADT: 3,150
SH 130 SB ON RAMP
FairOver: MANKINS BRANCH
1.90 MI S OF SH 29, Williamson, TX
Built 2006 Load: 40.8 t ADT: 200
SH 130 SB ML
FairOver: CR 118
2.70 MI N OF US 79, Williamson, TX
Built 2006 Load: 40.8 t ADT: 3,200
RM 1869
FairOver: SOUTH SAN GABRIEL RIVER
1.70 MI W OF SH 29, Williamson, TX
Built 1963 Load: 40.8 t ADT: 5,667
CR 429
FairOver: PECAN CREEK
0.65 MI N OF FM 1331, Williamson, TX
Built 1988 Load: 40.8 t ADT: 100
CR 417
FairOver: TURKEY CREEK
0.20 MI N OF CR 412, Williamson, TX
Built 1989 Load: 40.8 t ADT: 90
CR174(HAIRY MAN RD
FairOver: BRUSHY CREEK
2.05 MI W OF IH 35, Williamson, TX
Built 1994 Load: 40.8 t ADT: 5,529
RIVER CHASE BLVD
FairOver: DRAW
0.60 MI N OF SH 29, Williamson, TX
Built 1999 Load: 40.8 t ADT: 400
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.