County profile · official public datasets

Collin County, TX

1,127 public highway bridges tracked in the FHWA National Bridge Inventory: 67% rated Good, 32.9% Fair, 0.1% Poor.

1,127
Public bridges: 67%
Good condition: 0.1%
Poor condition

The verdict

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

Collin 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 36%
lowest Poor share in state: 0.1%
Poor-condition share: 1,127
public highway bridges: 1998
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.

Collin County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Collin County ranks #89 of 247 Texas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.1%). Collin County, Texas contains 1,127 public highway bridges. Roughly 67% are rated “Good,” 32.9% “Fair,” and 0.1% “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

1,127

Public highway bridges in Collin County

Good condition

67%

755 of 1,127 rated 7-9

Fair condition

32.9%

371 of 1,127 rated 5-6

Poor condition

0.1%

1 of 1,127 rated 4 or below

In-state Poor-share rank

#89 of 247

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

Condition distribution

Share of 1,127 NBI-tracked bridges by lowest applicable component rating.

Good

67% (755)

Fair

32.9% (371)

Poor

0.1% (1)

Collin County's Poor-condition bridges carry 500 vehicle crossings a day

That is 0% of the county's reported daily bridge traffic on 0.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 500 crossings a day against 15,076 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 1,127 of 1,127 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

7% of Collin County's bridges have passed the 50-year mark

79 of the 1,127 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% 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 100% of the county's Poor-condition bridge traffic

STACY RD EB over COTTONWOOD CREEK, built 2001, carries 500 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 1-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 500 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1920s

1
1930s

2
1940s

9
1950s

29
1960s

11
1970s

76
1980s

163
1990s

277
2000s

307
2010s

224
2020s

28

What this shows Construction peaked in the 2000s, when 307 of the county's bridges still in the inventory were built, which is 27.2% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year is 1998, 18 years newer than the Texas average of 1980.

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

The 5 Texas counties nearest Collin County in number of bridges, with their condition splits. Its 0.1% Poor share is the 1st-lowest of these 6. Its average build year of 1998 against a peer-group mean of 1991 is 7 years newer.

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

Bridge inventory size and condition shares for Collin County and the 5 Texas counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Williamson County	1,170	67.4%	32.2%	0.3%	1995
Collin County (this page)	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
McLennan County	714	51.8%	46.2%	2%	1980

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

Similar inventory size

Nearest county inventories outside TX (1,127 bridges here).

Tulsa County, OK · 1,135 bridges
Riverside County, CA · 1,117 bridges
Clark County, NV · 1,141 bridges
Pima County, AZ · 1,150 bridges

Similar average build year

Nearest mean year-built outside TX (1998 here).

Orange County, FL · avg 1998 · 885 bridges
Pipestone County, MN · avg 1998 · 185 bridges
Hyde County, NC · avg 1998 · 75 bridges
Hertford County, NC · avg 1998 · 58 bridges

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

All 1,127 Good 755 Fair 371 Poor 1

Good-condition bridges (755)

Sort:

Collin County Bridge Snapshot

Condition distribution

Collin County's Poor-condition bridges carry 500 vehicle crossings a day

7% of Collin County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

How Collin 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 (755)

SH 121 NB FR

SRT ML & SH 121 FR

SRT NB

SH 121 SB FR

SH 121 NB FR

SAM RAYBURN TOLL

SRT NB

SRT SB

SRT NB

SRT SB

SRT NB

SRT SB

SRT NB

SRT SB

SRT NB

SRT SB

SRT NB

SH 121 NB

SH 121 SB

SH 121 NB OFF RAMP

SRT NB

SRT NB

SRT NBML

SH 121 SB ON RAMP

SRT SB

SRT SB

SRT NB

SH121 to US75 CONN

SW CONNECTOR

SH 121 NB / SS 399

SH 121 SB / SS 399

SRT NB

SRT SB

SRT NB OFF-RP

SRT SB ON-RP

SRT & SH 121

E-N DIRECT CONN

SH 121 NB FR

SH 121 SB FR

NE DIRECT CONN

SH121NB /US75 CONN

DNT SB ML

HDQ-NDNT & DNT NB

SH 121 N TO DNT S

SH 121 N TO DNT N

SH 121 S TO DNT N

DNT S TO SH 121 S

DNT S TO SH 121 N

DNT N TO SH 121 S

DNT N TO SRT N

Related