Boulder County, CO

311 public highway bridges

Boulder County Bridge Snapshot

Boulder County, Colorado contains 311 public highway bridges in the FHWA National Bridge Inventory. Roughly 33.4% are rated “Good,” 60.5% “Fair,” 2.3% “Poor,” and 2.3% 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 CO 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.

311
Total Bridges
33.4%
Good
2.3%
Poor
2.3%
Structurally Deficient

Condition Distribution

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

Related

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