County profile · official public datasets

Harris County, TX

4,029 public highway bridges tracked in the FHWA National Bridge Inventory: 50.7% rated Good, 48.7% Fair, 0.6% Poor.

4,029
Public bridges
50.7%
Good condition
0.6%
Poor condition

The verdict

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

Harris 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 43%
lowest Poor share in state
0.6%
Poor-condition share
4,029
public highway bridges
1989
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.

Harris County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Harris County ranks #106 of 247 Texas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.6%). Harris County, Texas contains 4,029 public highway bridges. Roughly 50.7% are rated “Good,” 48.7% “Fair,” and 0.6% “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

4,029

Public highway bridges in Harris County

Good condition

50.7%

2,042 of 4,029 rated 7-9

Fair condition

48.7%

1,963 of 4,029 rated 5-6

Poor condition

0.6%

24 of 4,029 rated 4 or below

In-state Poor-share rank

#106 of 247

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

Condition distribution

Share of 4,029 NBI-tracked bridges by lowest applicable component rating.

Good
50.7% (2,042)
Fair
48.7% (1,963)
Poor
0.6% (24)

Harris County's Poor-condition bridges carry 472,127 vehicle crossings a day

That is 0.4% of the county's reported daily bridge traffic on 0.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 19,672 crossings a day against 26,874 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 4,029 of 4,029 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

22.1% of Harris County's bridges have passed the 50-year mark

892 of the 4,029 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 50.7% 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 24.6% of the county's Poor-condition bridge traffic

IH 45 NB over CROSSTIMBERS ST, built 1960, carries 116,204 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 24-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 472,127 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Harris County's bridges were built

4,029 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1980s, when 816 of the county's bridges still in the inventory were built, which is 20.3% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1989, 9 years newer than the Texas average of 1980.

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

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

The 5 Texas counties nearest Harris County in number of bridges, with their condition splits. Its 0.6% Poor share is the 5th-lowest of these 6. Its average build year of 1989 against a peer-group mean of 1988 is in line with the group.

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

Bridge inventory size and condition shares for Harris County and the 5 Texas counties closest to it in inventory size
County Bridges Poor
Harris County (this page) 4,029 0.6%
Dallas County 3,230 1%
Tarrant County 2,617 0.4%
Bexar County 2,342 0.3%
Travis County 1,544 0.2%
Williamson County 1,170 0.3%

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

Similar inventory size

Nearest county inventories outside TX (4,029 bridges here).

Similar average build year

Nearest mean year-built outside TX (1989 here).

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

All 4,029 Good 2,042 Fair 1,963 Poor 24

Good-condition bridges (2,042)

US59 NB Con/BW8 EB

Good

Over: BW 8 EB FR

BW 8/US 59 N INTERCHANG, Harris, TX

Built 2012 Load: 32.7 t ADT: 20,643

US 59 NB ON-RP #4

Good

Over: US 59 NB OFF-RAMP #6

3.10 MI N OF IH 610, Harris, TX

Built 1995 Load: 32.7 t ADT: 7,987

US 59 SB ON RP #7

Good

Over: UNPAVED AREA

3.8 MI N OF IH 610, Harris, TX

Built 1995 Load: 32.7 t ADT: 4,745

US 59 NB

Good

Over: CAVALCADE ST

0.50 MI S OF IH 610, Harris, TX

Built 1998 Load: 32.7 t ADT: 25,573

US 59 NB/IH 610 EB

Good

Over: US 59 ENT. RP-D

0.40 MI S OF IH610, Harris, TX

Built 1997 Load: 32.7 t ADT: 15,250

JACKSON HOV EXIT

Good

Over: R.O.W.

US 59 AT JACKSON ST, Harris, TX

Built 2002 Load: 32.7 t ADT: 10,000

US 59 SB ON-RAMP

Good

Over: US59 SB CONN TO IH10 WB

AT US59/IH10 INTERCHANGE, Harris, TX

Built 2003 Load: 32.7 t ADT: 20,620

US 59 SB

Good

Over: LYONS; RR; LORRAINE

0.50 MI N OF IH 10, Harris, TX

Built 1996 Load: 32.7 t ADT: 29,527

US 59 SB

Good

Over: QUITMAN ST

0.90 MI N OF IH 10, Harris, TX

Built 1997 Load: 32.7 t ADT: 29,527

US 59 SB

Good

Over: COLLINGSWORTH ST

1.7 MI N OF IH 10, Harris, TX

Built 1997 Load: 32.7 t ADT: 29,527

US 59 NB

Good

Over: LYONS; RR; LORRAINE

0.50 MI N OF IH 10, Harris, TX

Built 1997 Load: 32.7 t ADT: 25,573

US 59 NB

Good

Over: QUITMAN ST

0.90 MI N OF IH 10, Harris, TX

Built 1997 Load: 32.7 t ADT: 25,573

US 59 NB & NB HOV

Good

Over: COLLINGSWORTH ST

1.7 MI N OF IH 10, Harris, TX

Built 1997 Load: 32.7 t ADT: 25,573

IH 10 WB /US 59 SB

Good

Over: US 59 SB TO IH 10 EB

AT US59/IH10 INTERCHANGE, Harris, TX

Built 2003 Load: 32.7 t ADT: 20,000

US 59 HOV

Good

Over: US 59 SB FR

0.8 MI N OF IH 610, Harris, TX

Built 1996 Load: 32.7 t ADT: 18,670

BW 8 ML

Good

Over: SH 35

3.40 MI W OF BEAMER RD, Harris, TX

Built 1997 Load: 32.7 t ADT: 14,985

SH 35 NB CONN

Good

Over: IH 45 & IH 610

JCT SH 35 @ IH 45, Harris, TX

Built 2019 Load: 32.7 t ADT: 9,706

SP 5 NB

Good

Over: ELGIN ST

0.2 MI S OF IH 45, Harris, TX

Built 1999 Load: 32.7 t ADT: 40,000

SP 5 SB

Good

Over: ELGIN ST

0.2 MI S OF IH 45, Harris, TX

Built 1999 Load: 32.7 t ADT: 11,042

SPUR 5 SB

Good

Over: BRAYS BAYOU

0.95 MI S OF IH 45, Harris, TX

Built 1999 Load: 32.7 t ADT: 21,920

IH10WB / SH99NB DC

Good

Over: Misc St; Ramps and Fr Rd

1.4 MI W of Mason Road, Harris, TX

Built 2014 Load: 32.7 t ADT: 10,000

SH 99 NB

Good

Over: IH 10 & Mercantile Pkwy

3.4 Mi W of Fry Rd, Harris, TX

Built 2013 Load: 32.7 t ADT: 31,240

SH 99 SB

Good

Over: IH 10 & Mercantile Pkwy

3.4 Mi W of Fry Rd, Harris, TX

Built 2013 Load: 32.7 t ADT: 31,240

SH99S-IH10W CONN D

Good

Over: IH10 EX-RP/WBFR/SH99SBFR

AT IH 10 & SH 99 INT, Harris, TX

Built 2014 Load: 32.7 t ADT: 1,700

TAYLOR ST

Good

Over: IH 10

4.4 MI E OF IH 610, Harris, TX

Built 1965 Load: 32.7 t ADT: 12,360

IH 10

Good

Over: HCFCD DITCH

0.6 W OF IH 610, Harris, TX

Built 2006 Load: 32.7 t ADT: 272,758

IH 10 WB / BW 8 NB

Good

Over: IH 10 WB FR & BW 8 NB FR

4.90 MI E OF SH 6, Harris, TX

Built 2007 Load: 32.7 t ADT: 16,500

IH 10 EB / BW 8 SB

Good

Over: IH 10 EB FR & BW 8 SB FR

4.90 MI E OF SH 6, Harris, TX

Built 1989 Load: 32.7 t ADT: 16,500

IH 10

Good

Over: RUMMEL CREEK

AT JCT BW 8 AND IH 10, Harris, TX

Built 2007 Load: 32.7 t ADT: 265,257

IH 10

Good

Over: RUMMEL CREEK & TRIB

0.10 MI W OF BW 8, Harris, TX

Built 2007 Load: 32.7 t ADT: 266,639

IH 10/Campbell Rd

Good

Over: Drain

0.9 Mi W of Voss Rd, Harris, TX

Built 2005 Load: 32.7 t ADT: 15,000

IH 10 WB FR

Good

Over: WHITE OAK BAYOU

3.30 MI E OF IH 610, Harris, TX

Built 2010 Load: 32.7 t ADT: 15,100

IH 10 EB FR

Good

Over: HIKE & BIKE TRAIL

0.15 MI E OF STUDEMONT, Harris, TX

Built 2010 Load: 32.7 t ADT: 490

IH 10 EB FR

Good

Over: WHITE OAK BAYOU

3.30 MI E OF IH 610, Harris, TX

Built 2010 Load: 32.7 t ADT: 15,100

IH 10 EB FR

Good

Over: WHITE OAK BAYOU

3.80 MI E OF IH 610, Harris, TX

Built 2012 Load: 32.7 t ADT: 15,100

IH 10 WB FR

Good

Over: WHITE OAK BAYOU

3.80 MI E OF IH 610, Harris, TX

Built 2012 Load: 32.7 t ADT: 15,000

IH 610

Good

Over: FULTON ST & Metro RR

0.30 MI E OF IH 45, Harris, TX

Built 1960 Load: 32.7 t ADT: 152,874

IH 610

Good

Over: IRVINGTON BLVD

0.80 MI E OF IH 45, Harris, TX

Built 1960 Load: 32.7 t ADT: 152,874

IH 610

Good

Over: HUNTING BAYOU

1.3 MI N OF IH 10, Harris, TX

Built 2010 Load: 32.7 t ADT: 136,937

IH 610 NBFR

Good

Over: HUNTING BAYOU

1.3 MI N OF IH 10, Harris, TX

Built 2012 Load: 32.7 t ADT: 17,840

IH 610 SBFR

Good

Over: HUNTING BAYOU

1.3 MI N OF IH 10, Harris, TX

Built 2012 Load: 32.7 t ADT: 13,840

IH 610 EBFR

Good

Over: HUNTING BAYOU

1.5 MI E OF LOCKWOOD DR., Harris, TX

Built 2012 Load: 32.7 t ADT: 2,040

IH 610 WBFR

Good

Over: HUNTING BAYOU

1.5 MI E OF LOCKWOOD DR., Harris, TX

Built 2012 Load: 32.7 t ADT: 2,100

KELLEY ST.

Good

Over: IH 610 & HUNTING BAYOU

1.0 MI E of LOCKWOOD, Harris, TX

Built 2012 Load: 32.7 t ADT: 7,690

IH 610

Good

Over: HOMESTEAD ROAD

0.9 MI E OF LOCKWOOD DR, Harris, TX

Built 2010 Load: 32.7 t ADT: 132,861

IH 610

Good

Over: WAYSIDE DR

0.9 MI NW OF US 90A, Harris, TX

Built 2010 Load: 32.7 t ADT: 132,861

IH 610

Good

Over: WALLISVILLE RD

1.2 MI N OF IH 10, Harris, TX

Built 2010 Load: 32.7 t ADT: 136,937

IH 610

Good

Over: GELLHORN DR

0.6 MI N OF IH 10, Harris, TX

Built 2010 Load: 32.7 t ADT: 136,937

IH610 EB ENTR RAMP

Good

Over: IH610 EB EXIT RAMP

0.7 MI NE OF US 290, Harris, TX

Built 2013 Load: 32.7 t ADT: 10,000

IH 610 EB

Good

Over: ELLA BLVD

1.5 MI NE OF US 290, Harris, TX

Built 2013 Load: 32.7 t ADT: 91,000

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.