Boulder County, CO

311 public highway bridges

Boulder County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Boulder County, Colorado contains 311 public highway bridges. Roughly 33.4% are rated “Good,” 60.5% “Fair,” and 2.3% “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.

311
Total Bridges
33.4%
Good
60.5%
Fair
2.3%
Poor Condition

Condition Distribution

Good
33.4% (104)
Fair
60.5% (188)
Poor
2.3% (7)

All Bridges (311)

Kingsridge Blvd.

Fair

Over: Wonderland Creek

0.2 Mi N of Valmont Drive, Boulder, CO

Built 1988 Load: 32.7 t ADT: 812

Pearl Parkway

Fair

Over: S. Goose Creek Drainage

At 49th Street, Boulder, CO

Built 1986 Load: 32.7 t ADT: 10,375

47th Street

Fair

Over: South Goose Creek

40 Ft N of Pearl Parkway, Boulder, CO

Built 1986 Load: 32.7 t ADT: 4,774

Martin Drive

Fair

Over: Bear Crk and Bike Path

300 Ft. E of 36th St., Boulder, CO

Built 1995 Load: 32.7 t ADT: 662

Sterling Drive

Fair

Over: Left Hand Ditch

100 Ft E of 47th Street, Boulder, CO

Built 1975 Load: 32.7 t ADT: 937

Pearl Parkway

Fair

Over: Left Hand Ditch

500 Ft W of Foothills Pky, Boulder, CO

Built 1981 Load: 32.7 t ADT: 24,744

SB Table Mesa Dr.

Fair

Over: Bear Creek

Harvard Ln & SB Table, Boulder, CO

Built 1980 Load: 32.7 t ADT: 508

Colorado Avenue

Fair

Over: Skunk Creek

At 38th Street, Boulder, CO

Built 1979 Load: 32.7 t ADT: 7,343

Glenwood Drive

Fair

Over: Two Mile Creek

400 Ft W of State Hwy 36, Boulder, CO

Built 1972 Load: 32.7 t ADT: 3,439

Junction Pl

Fair

Over: Goose Creek

0.1 mi N of Pearl Pkwy, Boulder, CO

Built 2017 Load: 32.7 t ADT: 1,484

Baseline Road

Fair

Over: Bear Canyon Creek

300 ft E of Meadow Dr, Boulder, CO

Built 1980 Load: 32.7 t ADT: 14,884

MONROE DRIVE

Fair

Over: EMPSON DITCH

0.1 Mi S of Colorado Ave., Boulder, CO

Built 2020 Load: 32.7 t ADT: 1,175

EISENHOWER DRIVE

Fair

Over: EMPSON DITCH

0.5 MI S OF ARAPAHOE AVE, Boulder, CO

Built 1972 Load: 32.7 t ADT: 1,860

SH 93 ML

Fair

Over: SKUNK CREEK / PED PATH

0.1 MI N of 27th WAY, Boulder, CO

Built 2014 Load: 32.7 t ADT: 20,000

SH 119

Fair

Over: WONDERLAND CRK AND PATH

.5 MI W OF FOOTHILLS PKWY, Boulder, CO

Built 2006 Load: 32.7 t ADT: 26,000

SOUTH BOULDER RD

Fair

Over: DRAINAGE DITCH AR

IN LAFAYETTE, Boulder, CO

Built 1996 Load: 32.7 t ADT: 37,000

120TH STREET

Fair

Over: Coal Creek

0.25 M S of S. Boulder Rd, Boulder, CO

Built 1977 Load: 32.7 t ADT: 8,097

15th Avenue

Fair

Over: Oligarchy Ditch

100 Ft W of Lamplighte Dr, Boulder, CO

Built 1989 Load: 32.7 t ADT: 450

21st Ave Eastbound

Fair

Over: Oligarchy Ditch

300 Ft. E of Daley Dr., Boulder, CO

Built 1975 Load: 32.7 t ADT: 4,495

3rd Avenue

Fair

Over: Oligarchy Ditch

At Pace Street, Boulder, CO

Built 1969 Load: 32.7 t ADT: 16,797

Alpine Street

Fair

Over: Oligarchy Ditch

100 ft N of E 9th Ave., Boulder, CO

Built 1975 Load: 32.7 t ADT: 3,757

Boston Ave

Fair

Over: Spring Gulch

0.1 mile E. of Martin St., Boulder, CO

Built 2017 Load: 32.7 t ADT: 978

Dry Creek Drive

Fair

Over: Dry Creek No. 1

0.1 Mi So of Bent Way, Boulder, CO

Built 1991 Load: 32.7 t ADT: 5,490

E 5th Avenue

Fair

Over: Oligarchy Ditch

0.1 Mi East of Fox St, Boulder, CO

Built 1970 Load: 32.7 t ADT: 1,321

E 9th Avenue

Fair

Over: Oligarchy Ditch

100 ft E of Alpine Street, Boulder, CO

Built 2004 Load: 32.7 t ADT: 12,630

Fordham Street

Fair

Over: Dry Creek

0.3 Mi So of Nelson Road, Boulder, CO

Built 1997 Load: 32.7 t ADT: 1,944

Hover Road

Fair

Over: Oligarchy Ditch

100 Ft S of 20th Street, Boulder, CO

Built 1990 Load: 32.7 t ADT: 25,769

Hover Road

Fair

Over: Dry Creek No. 1

0.2 Mi S of Nelson Road, Boulder, CO

Built 1985 Load: 32.7 t ADT: 29,369

Pike Road

Fair

Over: Left Hand Creek

0.2 Mi E of Sunset St, Boulder, CO

Built 1994 Load: 32.7 t ADT: 13,459

Price/Frontage Rds

Fair

Over: Dry Creek

S. Sunset St and Hwy 11, Boulder, CO

Built 1984 Load: 32.7 t ADT: 7,332

Spencer Street

Fair

Over: Oligarchy Ditch

50 Ft So of 20th St, Boulder, CO

Built 1975 Load: 32.7 t ADT: 995

Sunset Way

Fair

Over: Dry Creek

20 Ft SW of Korte Way, Boulder, CO

Built 1996 Load: 32.7 t ADT: 540

McConnell Drive

Fair

Over: Saint Vrain Creek

50 Ft S of US36 / SH66, Boulder, CO

Built 2006 Load: 32.7 t ADT: 2,031

County Road 1

Fair

Over: Big Dry Creek

0.3 Mi N of Co Rd 20.5, Boulder, CO

Built 1995 Load: 32.9 t ADT: 9,859

SH 119 ML NB

Fair

Over: BEASLEY DITCH

@ 55TH ST NE OF BOULDER, Boulder, CO

Built 1958 Load: 33.4 t ADT: 22,000

SH 157 ML

Fair

Over: SKUNK CREEK

IN BOULDER, Boulder, CO

Built 1978 Load: 33.5 t ADT: 43,000

County Road 80

Fair

Over: North St. Vrain Creek

0.8 Mi W of US Hwy 36, Boulder, CO

Built 1988 Load: 33.6 t ADT: 199

County Road 80

Fair

Over: North St. Vrain Creek

20 Ft S of US Hwy 36, Boulder, CO

Built 1988 Load: 34.5 t ADT: 268

Folsom Street

Fair

Over: Boulder Creek

0.40 Mi S of Canyon Blvd, Boulder, CO

Built 1965 Load: 34.6 t ADT: 8,407

Baseline Road

Fair

Over: South Boulder Creek

0.1 Mi W of Cherryvale Rd, Boulder, CO

Built 1980 Load: 35.2 t ADT: 4,986

SH 93 ML

Fair

Over: PED. UNDERPASS

BROADWAY AND 16TH ST., Boulder, CO

Built 2013 Load: 35.6 t ADT: 27,000

SH 157 ML

Fair

Over: BOULDER CREEK

JUST N. OF HWY 7, Boulder, CO

Built 1981 Load: 35.8 t ADT: 43,000

McCaslin Blvd

Fair

Over: Coal Creek

0.3 Mi S of US Hwy 36, Boulder, CO

Built 1995 Load: 36.5 t ADT: 17,606

Flatiron Parkwy

Fair

Over: Dry Creek

0.1 Mi E of N 55th Street, Boulder, CO

Built 1985 Load: 36.7 t ADT: 2,240

US 36 ML

Fair

Over: NORTH ST VRAIN CREEK

IN LYONS, Boulder, CO

Built 2007 Load: 36.8 t ADT: 9,000

SH 119 ML NBND

Fair

Over: LEFT HAND CREEK

3.6 MI NE OF JCT SH 52, Boulder, CO

Built 1959 Load: 37.4 t ADT: 14,000

US 36 ML

Fair

Over: HIGHLAND CANAL

1.2 MI SE OF JCT SH 7 LYO, Boulder, CO

Built 1972 Load: 37.5 t ADT: 15,000

County Road 38

Fair

Over: Boulder Creek

1.5 Mi W of Co Rd 901, Boulder, CO

Built 1988 Load: 37.6 t ADT: 1,640

Winding Trail Dr

Fair

Over: Wonderland Creek

300 ft W of 28th, Boulder, CO

Built 2018 Load: 37.6 t ADT: 632

Arapahoe Avenue

Fair

Over: Boulder Creek

50 Ft S of Canyon Blvd, Boulder, CO

Built 1990 Load: 38.0 t ADT: 7,200

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

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge 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.