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.
Condition Distribution
All Bridges (311)
EBND US 36 ML
UnknownOver: US 36 SPUR/BASELINE RD
IN BOULDER, Boulder, CO
US 36 WBND SPUR
UnknownOver: US 36 SPUR/BASELINE RD
S end of BOULDER, Boulder, CO
SH 157 ML
UnknownOver: SH 119 ML
IN BOULDER, Boulder, CO
47TH STREET
UnknownOver: SH 157 ML
NEAR SH 119 IN BOULDER, Boulder, CO
TABLE MESA DRIVE
UnknownOver: US 36 ML
IN BOULDER, Boulder, CO
SH 157 RAMP
UnknownOver: US 36 ML
IN BOULDER, Boulder, CO
SH170 ML(McCaslin)
UnknownOver: US 36 ML
3.9 MI E OF JCT SH 93, Boulder, CO
EMMA ST.
UnknownOver: US 287 ML
IN LAFAYETTE, Boulder, CO
CHERRYVALE ROAD
UnknownOver: SH 36 ML
1.4 MI E OF JCT SH 157, Boulder, CO
WB US 36 ON RAMP
UnknownOver: WB BUS RAMP/BIKE PATH
MCCASLIN and US 36, Boulder, CO
EB US 36 OFF RAMP
UnknownOver: EB BUS RAMP
McCASLIN and US 36, Boulder, CO
Pratt Parkway
UnknownOver: BNRR and 1st Avenue
0.2 Mi N of Boston Ave, Boulder, CO
Co Rd 54A
FairOver: Middle Boulder Creek
Castle Rock Pull Off, Boulder, CO
BOULDER CREEK PATH
FairOver: BOULDER CREEK
4Mi Canyon Path at SH119, Boulder, CO
SH 157 ML
FairOver: PEARL STREET
2.9 MI N OF US 36, Boulder, CO
SH 157 ML
FairOver: BNSF RR
IN BOULDER, Boulder, CO
Oxford Rd (Cr 26)
FairOver: Boulder Feeder Ditch
0.3 Mi W of Co Rd 41, Boulder, CO
SH 93 ML
FairOver: SOUTH BOULDER CREEK
0.4 MI N OF JCT SH 170 +, Boulder, CO
US 36 ML EBND
FairOver: BOULDER CREEK
IN BOULDER, Boulder, CO
US 287 ML
FairOver: DRY CREEK
Ken Pratt Blvd-Longmont, Boulder, CO
SH 119 ML
FairOver: BOULDER CREEK
13.7 MI E OF JCT SH 72, Boulder, CO
SH 119 ML
FairOver: BOULDER CREEK
JUST WEST OF BOULDER, Boulder, CO
120TH STREET
FairOver: Rock Creek
0.5 Mi S of S. Boulder Rd, Boulder, CO
County Road 47
FairOver: St. Vrain Supply Canal
2.7 Mi N of St Hwy 66, Boulder, CO
County Road 130
FairOver: Middle Boulder Creek
2.5 Mi W of St Hwy 72, Boulder, CO
Rogers Road
FairOver: Lykin Gulch
0.25 Mi W of Airport Rd, Boulder, CO
SH 72 ML
FairOver: MIDDLE ST VRAIN CREEK
7 MI NORTH OF WARD, Boulder, CO
SH 170 ML
FairOver: SOUTH BOULDER CREEK
0.9 MI W. OF EL DORADO SP, Boulder, CO
SH 7 ML
FairOver: BEAR CANYON CREEK
JCT 157 & ARAPAHOE, Boulder, CO
Folsom Street
FairOver: Goose Creek
300 Ft. So. of Valmont, Boulder, CO
US 287 ML
FairOver: LEFT HAND CREEK
IN LONGMONT, Boulder, CO
St Vrain Road CR16
FairOver: Boulder Feeder Ditch
0.5 Mi E of Co Rd 51, Boulder, CO
SH 170 ML
FairOver: COMMUNITY DITCH
E ENT ELDORADO STATE PARK, Boulder, CO
55th Street
FairOver: Empson Ditch
250 Ft N of Penn. Ave., Boulder, CO
US 36 ML
FairOver: FOUR MILE CANYON CREEK
28th ST in BOULDER, Boulder, CO
US 36 ML
FairOver: SUPPLY DITCH
IN LYONS, Boulder, CO
FDR 298 & BC 116
FairOver: NORTH BOULDER CREEK
3.45 MI SW OF CO HWY 72, Boulder, CO
SH 157 ML
FairOver: BEAR CANYON CREEK
NEAR COLORADO AVE., Boulder, CO
C. R. 41 (63rd St)
FairOver: St. Vrain Creek
0.5 Mi N of Co Rd 10, Boulder, CO
Boston Ave (Cr 18)
FairOver: St. Vrain Creek
0.1 Mi E of Co Rd 15, Boulder, CO
Brockway Drive
FairOver: Goodhue Ditch
0.1 Mi E of 76th Street, Boulder, CO
Co Rd 54A
FairOver: Middle Boulder Creek
Castle Rock Pull Off, Boulder, CO
Rock Creek Pkwy.
FairOver: Rock Creek
0.3 Mi N of Coalton D, Boulder, CO
SH 72 ML
FairOver: SOUTH ST VRAIN CREEK
3.8 MI NORTH OF WARD, Boulder, CO
COUNTY ROAD 116
FairOver: BOULDER CREEK
3.3 MI WEST OF ST HWY 72, Boulder, CO
SH 170 ML
FairOver: DAVIDSON DITCH
1.5 MI W OF JCT SH 93, Boulder, CO
County Road 31
FairOver: St. Vrain Creek
0.6 Mi S of Co Rd 10, Boulder, CO
SH 93 ML
FairOver: BOULDER CREEK
N. of Arapahoe Ave, Boulder, CO
US 36 ML
FairOver: CANYON CREEK
IN BOULDER, Boulder, CO
SH 119 ML
FairOver: OLIGARCHY DITCH
IN LONGMONT, Boulder, CO
Read our methodology - how this data is sourced, computed, and verified.
Related
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.