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)

Sort:

SH 157 ML

Over: BNSF RR

IN BOULDER, Boulder, CO

Built 1988 Load: 26.5 t ADT: 34,000

SH 7 ML EBND

Over: BOULDER CREEK

ARAPAHOE AVENUE, Boulder, CO

Built 1966 Load: 27.3 t ADT: 15,000

County Road 84W

Over: North St. Vrain Creek

1.0 Mi NW of St Hwy 7, Boulder, CO

Built 1927 Load: 27.6 t ADT: 122

County Road 84S

Over: South St. Vrain Creek

250 ft S of Hwy 7, Boulder, CO

Built 2019 Load: 27.9 t ADT: 67

N. 61st Street

Over: Boulder Creek

1.0 Mi So of Jay Road, Boulder, CO

Built 1986 Load: 28.2 t ADT: 5,789

6th Street

Over: Boulder Creek

0.1 Mi So of Canyon Blvd, Boulder, CO

Built 1978 Load: 28.3 t ADT: 10,000

3rd Ave. EB

Over: GW RR

.15 Mi W of Jct 119, Boulder, CO

Built 1969 Load: 28.6 t ADT: 7,667

Dillon Road

Over: Coal Creek & Ped Tra

0.5 Mi E of McCaslin Blvd, Boulder, CO

Built 1993 Load: 29.1 t ADT: 15,732

SH 7 ML

Over: DRAW

0.35 MI E OF 75th ST, Boulder, CO

Built 1928 Load: 29.3 t ADT: 19,000

SH 157 ML SBND

Over: S BLDR Rd-TBLE MSA Dr

0.9 MI N OF JCT US 36, Boulder, CO

Built 1973 Load: 29.4 t ADT: 19,000

US 287 ML

Over: BOULDER CREEK

3 MI N OF JCT SH 7, Boulder, CO

Built 1985 Load: 29.9 t ADT: 24,000

US 287 ML

Over: DRY CREEK

2.7 MI NO OF JCT SH 52, Boulder, CO

Built 1990 Load: 30.0 t ADT: 24,000

SH 157 ML NBND

Over: SOUTH BOULDER ROAD

0.08 MI N OF JCT US 36, Boulder, CO

Built 1973 Load: 30.2 t ADT: 19,000

SH 72 ML

Over: SOUTH BOULDER CREEK

IN PINECLIFF, Boulder, CO

Built 1979 Load: 30.4 t ADT: 1,500

Martin Street

Over: Saint Vrain River

0.1 Mi N of SH119, Boulder, CO

Built 2009 Load: 30.8 t ADT: 11,759

County Road 103

Over: Middle St. Vrain Creek

100 Ft S of St Hwy 72, Boulder, CO

Built 1927 Load: 31.1 t ADT: 56

Public Road

Over: Coal Creek

.25 M N of Jct US Hwy 287, Boulder, CO

Built 1927 Load: 31.1 t ADT: 10,350

Hygiene Rd (Cr 10)

Over: St. Vrain Creek

1.0 Mi W of Co Rd 31, Boulder, CO

Built 1981 Load: 31.3 t ADT: 502

30th Street

Over: North Goose Creek

At Mapleton & 30th St, Boulder, CO

Built 1994 Load: 32.1 t ADT: 21,233

2nd Avenue

Over: Coal Creek

0.2 Mi South of Williams, Boulder, CO

Built 1992 Load: 32.4 t ADT: 492

WILD BASIN ROAD

Over: NORTH ST. VRAIN CREEK

HWY 7 TO WILD BASIN TRAIL, Boulder, CO

Built 1982 Load: 32.7 t ADT: 75

WILD BASIN ROAD

Over: NORTH ST. VRAIN CREEK

2.1 MILES FROM PARK BOUND, Boulder, CO

Built 1982 Load: 32.7 t ADT: 75

Sixth St (CR 130)

Over: Middle Boulder Creek

.1 Mi S CR 130Eldorado Rd, Boulder, CO

Built 2005 Load: 32.7 t ADT: 106

Nelson Rd (Cr 20)

Over: Boulder Feeder Ditch

1.0 Mi W of Co Rd 39, Boulder, CO

Built 1950 Load: 32.7 t ADT: 2,692

N. 75th St (Cr 25)

Over: Boulder Creek

0.1 Mi S of Jay Road, Boulder, CO

Built 1978 Load: 32.7 t ADT: 8,907

County Road 33

Over: Left Hand Creek

0.3 M N of Oxford Rd (26), Boulder, CO

Built 1980 Load: 32.7 t ADT: 4,344

Niwot Road (Cr 34)

Over: Dry Creek

0.7 Mi E of St Hwy 119, Boulder, CO

Built 1985 Load: 32.7 t ADT: 5,021

Kenosha Rd (CR 38)

Over: Coal Creek

0.2 Mi W of Co Rd 901, Boulder, CO

Built 1965 Load: 32.7 t ADT: 2,305

Cherryvale Road

Over: Davidson Ditch

0.5 Mi N of St Hwy 170, Boulder, CO

Built 1973 Load: 32.7 t ADT: 3,123

Woodland Rd (CR4)

Over: Highland Ditch

1.3 Mi E of 75th Street, Boulder, CO

Built 1976 Load: 32.7 t ADT: 1,163

Independence Ave.

Over: Boulder & Whiterock Dtch

0.4 Mi E of St Hwy 119, Boulder, CO

Built 1973 Load: 32.7 t ADT: 574

Niwot Meadow Farm

Over: Dry Creek No 2

0.2 Mi E of 83rd St, Boulder, CO

Built 2005 Load: 32.7 t ADT: 102

N 41st St (Cr 59)

Over: Left Hand Creek

325 Ft S of Co Rd 26, Boulder, CO

Built 1960 Load: 32.7 t ADT: 226

South Boulder Road

Over: Viele Channel (Ditch)

0.6 Mi E of US Hwy 36, Boulder, CO

Built 1975 Load: 32.7 t ADT: 9,270

S Boulder Road

Over: South Boulder Creek

0.4 Mi E of US Hwy 36, Boulder, CO

Built 1986 Load: 32.7 t ADT: 9,270

CR 62 (Empire Dr)

Over: Coal Creek

0.7 M E of St Hwy 42, Boulder, CO

Built 1935 Load: 32.7 t ADT: 1,080

County Road 9

Over: Boulder Creek

0.3 Mi N of Co Rd 42, Boulder, CO

Built 1960 Load: 32.7 t ADT: 59

County Road 901

Over: Boulder Creek

0.3 Mi N of St Hwy 52, Boulder, CO

Built 1976 Load: 32.7 t ADT: 6,549

Boulder Hills Dr

Over: Boulder Feeder Ditch

50 Ft E of Stirrup Lane, Boulder, CO

Built 1980 Load: 32.7 t ADT: 209

Strath Street

Over: Left Hand Creek

0.2 Mi N of Niwot Rd, Boulder, CO

Built 1970 Load: 32.7 t ADT: 92

Twin Lakes Road

Over: BLDR and Whiterock Ditch

0.2 Mi E of 63rd Street, Boulder, CO

Built 1975 Load: 32.7 t ADT: 1,018

Mc Sorley Lane

Over: South Boulder Creek

0.1 Mi W of Cherryvale Rd, Boulder, CO

Built 1970 Load: 32.7 t ADT: 272

Spring Drive

Over: Davidson Ditch

0.7 Mi S of S. Boulder Rd, Boulder, CO

Built 1970 Load: 32.7 t ADT: 1,022

Folsom Street

Over: Boulder Whiterock Ditch

20 Ft N of Pearl Street, Boulder, CO

Built 1970 Load: 32.7 t ADT: 13,574

30th Street

Over: Empson Ditch

0.59 Mi N of Baseline Rd, Boulder, CO

Built 1963 Load: 32.7 t ADT: 16,733

30th Street

Over: Boulder Creek

0.79 Mi N. of Baseline Rd, Boulder, CO

Built 1963 Load: 32.7 t ADT: 33,663

Juniper Avenue

Over: Elmers Two Mile Ditch

200 Ft E of 26th Street, Boulder, CO

Built 1965 Load: 32.7 t ADT: 666

Kalmia Avenue

Over: Elmers Two Mile Ditch

0.1 Mi W of Folsom Street, Boulder, CO

Built 1973 Load: 32.7 t ADT: 551

Moorhead Avenue

Over: Skunk Creek

0.1 Mi E of 27th Way, Boulder, CO

Built 1970 Load: 32.7 t ADT: 4,313

Moorhead Avenue

Over: Bear Creek: Bike Path

0.4 Mi NW of Table Mesa D, Boulder, CO

Built 1995 Load: 32.7 t ADT: 2,461

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

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