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)

FDR 112

Fair

Over: SOUTH ST VRAIN CREEK

5.75 MI WEST OF CO HWY 72, Boulder, CO

Built 1989 Load: 38.2 t ADT: 177

County Road 103

Fair

Over: Middle St. Vrain Creek

0.5 Mi SW of St Hwy 7, Boulder, CO

Built 1993 Load: 38.8 t ADT: 170

County Road 96

Fair

Over: South St. Vrain Creek

100 Ft. W of St Hwy 72, Boulder, CO

Built 2000 Load: 39.0 t ADT: 64

US 287 ML

Fair

Over: LOWER BOULDER DITCH

3.4 MI N OF LAFAYETTE, Boulder, CO

Built 1997 Load: 39.0 t ADT: 26,000

Valmont Rd (CR 52)

Fair

Over: South Boulder Creek

0.4 Mi E of 55th St., Boulder, CO

Built 2006 Load: 39.2 t ADT: 15,236

SH 119 N/EBND

Fair

Over: FOUR MILE CREEK

IN BOULDER, Boulder, CO

Built 1958 Load: 39.5 t ADT: 4,800

SH 119 ML

Fair

Over: NORTH BEAVER CREEK

IN NEDERLAND, Boulder, CO

Built 1948 Load: 40.6 t ADT: 4,000

SH 157 ML

Fair

Over: WALNUT STREET

IN BOULDER, Boulder, CO

Built 1981 Load: 40.9 t ADT: 43,000

Prospect Road CR24

Fair

Over: Boulder Feeder Ditch

0.3 Mi E of Co Rd 57, Boulder, CO

Built 1988 Load: 41.3 t ADT: 180

17th Street

Fair

Over: Boulder Creek

0.4 Mi So of Canyon Blvd., Boulder, CO

Built 1985 Load: 41.5 t ADT: 7,658

SH 7 (ARAPAHOE)

Fair

Over: BIKE/PED UNDERPASS

EAST OF JCT SH 7 & SH, Boulder, CO

Built 2006 Load: 42.1 t ADT: 29,000

SH 119 ML WBND

Fair

Over: ST. VRAIN RIVER

NEAR LONGMONT, Boulder, CO

Built 2003 Load: 42.4 t ADT: 12,000

Pearl Parkway

Fair

Over: North Goose Creek

0.6 M E of Foothills Pkwy, Boulder, CO

Built 1986 Load: 42.5 t ADT: 8,372

Deerwood Drive

Fair

Over: Oligarchy Ditch

20 Ft W of Co Rd 1, Boulder, CO

Built 2000 Load: 42.6 t ADT: 1,709

Hover Road

Fair

Over: St. Vrain River

100 Ft S of 3rd Avenue, Boulder, CO

Built 1960 Load: 42.8 t ADT: 26,762

SH 93 ML

Fair

Over: PEDESTRIAN UNDERPASS

BROADWAY AT COLLEGE BLVD, Boulder, CO

Built 1992 Load: 44.3 t ADT: 27,000

County Road 84S

Fair

Over: South St. Vrain Creek

0.1 Mi S of St Hwy 7, Boulder, CO

Built 1990 Load: 44.6 t ADT: 637

County Road 128E

Fair

Over: North Boulder Creek

3.9 Mi E of St Hwy 72, Boulder, CO

Built 1994 Load: 45.3 t ADT: 80

County Road 124E

Fair

Over: North Boulder Creek

0.1 Mi NE of St Hwy 7, Boulder, CO

Built 1994 Load: 46.0 t ADT: 214

North 55th Street

Fair

Over: Boulder Creek

0.1 Mi N of Flatiron Pkwy, Boulder, CO

Built 1985 Load: 46.1 t ADT: 11,600

SH 93 ML

Fair

Over: COAL CREEK

3.5 MI NO OF JCT SH 72, Boulder, CO

Built 1965 Load: 46.4 t ADT: 16,000

Airport Road

Fair

Over: Dry Creek

0.1 Mi N of Buckthorn Dr., Boulder, CO

Built 1994 Load: 46.6 t ADT: 11,244

County Road 71

Fair

Over: North St. Vrain Creek

30 Ft So of US Hwy 36, Boulder, CO

Built 1991 Load: 47.0 t ADT: 178

CR124E-Hummer Dr.

Fair

Over: North Boulder Creek

1.2 Mi NE of St Hwy 73, Boulder, CO

Built 1994 Load: 47.7 t ADT: 135

SH 7 ML

Fair

Over: NORTH ST VRAIN CREEK

IN LYONS, Boulder, CO

Built 1955 Load: 47.8 t ADT: 2,600

SH 7 ML

Fair

Over: SOUTH BOULDER CREEK

IN BOULDER, Boulder, CO

Built 1938 Load: 48.5 t ADT: 25,000

SH 52 ML

Fair

Over: WHITE ROCK BOULDER DITCH

NIWOT AT 79th ST INT, Boulder, CO

Built 1965 Load: 49.4 t ADT: 8,900

County Road 35

Fair

Over: St. Vrain Creek

0.2 Mi S of Co Rd 10, Boulder, CO

Built 1996 Load: 52.3 t ADT: 78

Airport Road CR25

Fair

Over: Left Hand Creek

50 Ft N of St Hwy 119, Boulder, CO

Built 2003 Load: 54.2 t ADT: 10,085

Airport Road

Fair

Over: St. Vrain River Overflow

0.2 Mi N of St Vrain Rd, Boulder, CO

Built 2006 Load: 54.2 t ADT: 13,131

SH 119 ML SBND

Fair

Over: BEASLEY DITCH

@ 55TH ST NE OF BOULDER, Boulder, CO

Built 1971 Load: 54.4 t ADT: 22,000

Airport Road

Fair

Over: Lykins Gulch

500 ft N of Rogers Road, Boulder, CO

Built 2006 Load: 57.2 t ADT: 13,906

County Road 132

Fair

Over: Boulder Creek

75 Ft S of St Hwy 119, Boulder, CO

Built 1935 Load: 57.4 t ADT: 846

SH 7 ML

Fair

Over: NORTH ST VRAIN CREEK

10 MI SE OF ESTES PARK, Boulder, CO

Built 1973 Load: 60.1 t ADT: 1,800

Horizon Avenue

Fair

Over: Rock Creek

.1 MI East 120th, Boulder, CO

Built 2000 Load: 64.8 t ADT: 1,043

9th Street

Fair

Over: Boulder Creek

0.08 Mi N of Arapahoe Ave, Boulder, CO

Built 1978 Load: 67.0 t ADT: 14,000

US 287 ML

Fair

Over: DRAW

IN BOULDER COUNTY, Boulder, CO

Built 1994 Load: 68.0 t ADT: 39,000

US 287 ML

Fair

Over: HIGHLAND DITCH

2.1 MI NO OF JCT SH 66, Boulder, CO

Built 1999 Load: 70.1 t ADT: 23,000

Cherryvale Road

Fair

Over: Davidson Ditch

0.9 Mi S of US Hwy 36, Boulder, CO

Built 1986 Load: 73.6 t ADT: 3,123

SH 119 SBND

Fair

Over: BEASLEY DITCH

Adjacent to Jay Rd, Boulder, CO

Built 1971 Load: 79.1 t ADT: 22,000

SH 119 ML

Fair

Over: NORTH BOULDER CREEK

7.7 MI E OF JCT SH 72, Boulder, CO

Built 1948 Load: 89.8 t ADT: 3,200

SH 157 ML

Fair

Over: WONDERLAND CREEK

IN BOULDER, Boulder, CO

Built 1987 Load: 89.8 t ADT: 34,000

SH 157 ML

Fair

Over: BOULDER, WHITEROCK DITCH

IN BOULDER, Boulder, CO

Built 1987 Load: 89.8 t ADT: 34,000

SH 119 ML

Fair

Over: MIDDLE BOULDER CREEK

IN NEDERLAND, Boulder, CO

Built 1933 Load: 89.8 t ADT: 5,800

SH 42 ML

Fair

Over: COAL CREEK

3.3 MI SE OF JCT SH 7, Boulder, CO

Built 1967 Load: 89.8 t ADT: 11,000

SH 157 ML

Fair

Over: SOUTH GOOSE CREEK

0.03 MI N OF PEARL ST, Boulder, CO

Built 1986 Load: 99.9 t ADT: 42,000

SH 157 ML

Fair

Over: NORTH GOOSE CREEK

0.05 MI N OF PEARL ST., Boulder, CO

Built 1986 Load: 99.9 t ADT: 42,000

SH 128 ML

Fair

Over: COAL CREEK

0.4 MI E OF JCT SH 93, Boulder, CO

Built 1967 Load: 99.9 t ADT: 4,100

Coalton Drive

Fair

Over: Rock Creek

0.15 Mi East of McCaslin, Boulder, CO

Built 2000 Load: 99.9 t ADT: 4,964

Indiana Avenue

Fair

Over: Rock Creek

150 Ft N of Coalton D, Boulder, CO

Built 1999 Load: 99.9 t ADT: 1,916

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.