Harris County, TX

4,030 public highway bridges

Harris County Bridge Snapshot

Harris County, Texas contains 4,030 public highway bridges in the FHWA National Bridge Inventory. Roughly 31.2% are rated “Good,” 31.4% “Fair,” 0.4% “Poor,” and 0.4% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in TX are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

4,030

Total Bridges

31.2%

Good

0.4%

Poor

0.4%

Structurally Deficient

Condition Distribution

Good

31.2% (1,259)

Fair

31.4% (1,266)

Poor

0.4% (18)

SD

0.4% (18)

All Bridges (4,030)

Sort:

SH146NB TO SP330WB

Over: SH 146, SP330, DECKER DR

AT JCT SH146 AND SPUR330, Harris, TX

Built 2002 ADT: 42,300

SH 146 SB

Over: SPUR 330

AT INT SH 146 & SPUR 330, Harris, TX

Built 1982 ADT: 10,950

SH 146 NB

Over: SPUR 330

AT INT SH 146 & SPUR 330, Harris, TX

Built 1982 ADT: 43,180

S 330 E TO SH 146B

Over: SH 146 SB FR

AT INT SH 146 & SPUR 330, Harris, TX

Built 2010 ADT: 26,030

SP330E TO SH 146 C

Over: SH 146

AT INT SH 146 & SPUR 330, Harris, TX

Built 2010 ADT: 25,520

SPUR 330 TO SH 146

Over: SPUR 330 EB

AT INT SH 146 & SPUR 330, Harris, TX

Built 2010 ADT: 26,030

SH 146 S TO 330 W

Over: SH 146 SB FR

AT INT OF SH 146 & S 330, Harris, TX

Built 2010 ADT: 7,190

IH 45

Over: ROBERTS & NETTLETON

3.5 MI N OF IH 610, Harris, TX

Built 1948 ADT: 3,000

IH 45

Over: SCOTT ST

3.5 MI N OF IH 610, Harris, TX

Built 1948 ADT: 8,328

IH 45

Over: CULLEN BLVD

1.50 MI SE OF US 59, Harris, TX

Built 1948 ADT: 109,660

IH 45 SBML

Over: SP 5 NB, HB&T RR, ELGIN

1.80 MI SE OF US 59, Harris, TX

Built 1948 ADT: 32,790

IH 45 NB

Over: UP RR & TELLEPSEN RD

0.95 MI NW OF US 90A, Harris, TX

Built 1948 ADT: 850

IH 45 NB

Over: TELEPHONE RD

2.40 MI NW OF IH 610, Harris, TX

Built 1949 ADT: 2,000

IH 45 NB

Over: GRIGGS, BROAD/MYRTLE, RR

0.75 MI SE OF US 90A, Harris, TX

Built 1950 ADT: 1,000

IH 45

Over: WOODRIDGE DRIVE

0.5 MI NW OF IH 610, Harris, TX

Built 1951 ADT: 7,500

IH 45

Over: PARK PLACE & BROADWAY

1 MI S OF IH 610, Harris, TX

Built 1952 ADT: 10,000

SP 5 SB CONN

Over: IH 45, HOV, ST JOSEPH

IH 45/US 59 INTERCHANGE, Harris, TX

Built 1954 ADT: 184,380

W DALLAS ST

Over: IH 45

0.10 MI S OF ALLEN PKWY, Harris, TX

Built 1955 ADT: 215,860

JEFFERSON ST EXIT

Over: CALHOUN ST TO IH 45 NB

0.30 MI S OF ALLEN PKWY, Harris, TX

Built 1955 ADT: 21,580

IH 45 NB

Over: BUFFALO BYU/ALLEN PKWY

0.10 MI N OF DALLAS ST, Harris, TX

Built 1955 ADT: 227,580

IH 45

Over: LITTLE YORK RD

4.75 MI N OF IH 610, Harris, TX

Built 1959 ADT: 26,780

IH 45

Over: PARKER RD

4.00 MI N OF IH 610, Harris, TX

Built 1959 ADT: 19,667

IH 45

Over: TIDWELL RD

2.50 MI N OF IH 610, Harris, TX

Built 1959 ADT: 270,800

IH 45 NB

Over: AIRLINE DR & VICTORIA DR

1.5 MI N OF IH 610, Harris, TX

Built 1960 ADT: 10,000

IH 45 NB

Over: CROSSTIMBERS ST

1.25 MI N OF IH 610, Harris, TX

Built 1960 ADT: 10,000

IH 45 NB

Over: STOKES RD & UPRR

0.50 MI N OF IH 610, Harris, TX

Built 1960 ADT: 500

QUITMAN RD

Over: IH 45 NB

0.20 MI N OF IH 10, Harris, TX

Built 1959 ADT: 106,290

IH 45 NB EXT/HOU

Over: ALLEN PKWY/BUFFALO BYU

0.10 MI N OF DALLAS ST, Harris, TX

Built 1962 ADT: 227,580

IH 45 NB

Over: IH 45 NB HOUSTON EXIT

0.30 MI N OF DALLAS ST, Harris, TX

Built 1962 ADT: 116,060

IH 45 SBFR

Over: W DALLAS ST

0.10 MI S OF ALLEN PKWY, Harris, TX

Built 1962 ADT: 113,790

IH 45 NB ON RP

Over: W DALLAS ST

0.10 MI S OF ALLEN PKWY, Harris, TX

Built 1963 ADT: 113,790

IH 45 SB

Over: WHITE OAK BYU & IH10 WB

@ IH-10 & IH-45, Harris, TX

Built 1961 ADT: 125,804

NORTH ST

Over: IH 45

0.75 MI N OF IH 10, Harris, TX

Built 1961 ADT: 212,590

IH 45 NB

Over: LINK RD

0.50 MI S OF IH 610, Harris, TX

Built 1962 ADT: 2,000

IH 45 NB

Over: CAVALCADE RD

0.60 MI S OF IH 610, Harris, TX

Built 1962 ADT: 10,000

IH 45 NB

Over: W PATTON ST

2.00 MI N OF IH 10, Harris, TX

Built 1962 ADT: 10,000

COTTAGE ST

Over: IH 45

1.25 MI N OF IH 10, Harris, TX

Built 1962 ADT: 212,590

N MAIN ST

Over: IH 45

1.00 MI N OF IH 10, Harris, TX

Built 1962 ADT: 212,590

IH 45 SB ON-RAMP

Over: CROSSTIMBERS RAMP

1.30 MI N OF IH 610, Harris, TX

Built 1967 ADT: 27,620

IH45 SB / NASA1 EB

Over: IH 45

0.4 MI SE OF FM 528, Harris, TX

Built 2009 ADT: 100,000

IH 45 NB

Over: NASA RD 1 (NASA BYPASS)

1.4 MI NW OF FM 518, Harris, TX

Built 2008 ADT: 42,210

IH 45 SB

Over: NASA RD 1 (NASA BYPASS)

1.4 MI NW OF FM 518, Harris, TX

Built 2008 ADT: 42,210

NASA RD 1

Over: KOBAYASHI RD

0.4 MI SE OF FM 528, Harris, TX

Built 2009 ADT: 3,000

NASA1 WB / IH45 NB

Over: IH 45 NBFR

0.4 MI SE OF FM 528, Harris, TX

Built 2009 ADT: 6,700

SP 5 NBFR

Over: IH 45 NBFR

1.70 MI SE OF US 59, Harris, TX

Built 1976 ADT: 4,530

LOMBARDY ST

Over: IH 45 NB FR

1.00 MI NW OF US 90A, Harris, TX

Built 1977 ADT: 4,530

LOMBARDY ST

Over: IH 45 SB FR

1.00 MI NW OF US 90A, Harris, TX

Built 1977 ADT: 2,090

TELLEPSEN ST

Over: IH 45 NB FR

0.85 MI NW OF US 90A, Harris, TX

Built 1977 ADT: 4,530

TELLEPSEN ST

Over: IH 45 SB FR

0.85 MI NW OF US 90A, Harris, TX

Built 1977 ADT: 2,090

GRIGGS RD

Over: IH 45 NBFR

0.75 MI SE OF US 90A, Harris, TX

Built 1977 ADT: 19,380

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

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026