Summit County, CO

57 public highway bridges

Summit County Bridge Snapshot

Summit County, Colorado contains 57 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.8% are rated “Good,” 57.9% “Fair,” 5.3% “Poor,” and 5.3% 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.

57

Total Bridges

22.8%

Good

5.3%

Poor

5.3%

Structurally Deficient

Condition Distribution

Good

22.8% (13)

Fair

57.9% (33)

Poor

5.3% (3)

SD

5.3% (3)

All Bridges (57)

Sort:

SH 91 ML

Over: I 70 ML

AT COPPER MOUNTAIN, Summit, CO

Built 1977 ADT: 18,000

SHRINE PASS ROAD

Over: I 70 ML

0.1 MI E OF EAGLE SUMMIT, Summit, CO

Built 1975 ADT: 640

I 70 ML WBND

Over: FARM ACCESS ROAD

1.6 MI E OF JCT SH 6, Summit, CO

Built 1964 ADT: 100

I70 ML WBND

Over: SH 9 ML

AT SILVERTHORNE, Summit, CO

Built 1971 ADT: 32,700

I 70 ML EBND

Over: US 6 ML

AT SILVERTHORNE, Summit, CO

Built 1971 ADT: 22,900

SH 9 ML

Over: I 70 ML

AT FRISCO, Summit, CO

Built 1971 ADT: 28,000

I 70 ML EBND

Over: BlueRvr-Adams Ave and...

10.5 MI E OF JCT SH 91, Summit, CO

SH 91 ML

Over: CLIMAX MINE HAUL ROAD

.1 MI N LAKE/SUMMIT CO LI, Summit, CO

Built 1989 ADT: 3,200

SLATE CREEK RD

Over: BLUE RIVER

0.4 MI WEST OF HIGHWAY 9, Summit, CO

Built 1923 Load: 8.1 t ADT: 13

I 70 ML EBND

Over: WILDER GULCH

1 MI E OF EAGLE SUMMIT CL, Summit, CO

Built 1977 Load: 13.0 t ADT: 10,000

FRENCH STREET

Over: BLUE RIVER

JUST WEST OF MAIN ST, Summit, CO

Built 1985 Load: 15.5 t ADT: 2,706

E. KEYSTONE RD.

Over: SNAKE RIVER

.2 MI W OF MONTEZUMA RD, Summit, CO

Built 1978 Load: 19.6 t ADT: 433

County Road 1813

Over: Blue River

26 mi NW of Silverthorne, Summit, CO

Built 1938 Load: 22.5 t ADT: 10

HAMILTON CREEK RD

Over: BLUE RIVER

.4 MILE EAST OF HIGHWAY 9, Summit, CO

Built 1980 Load: 22.5 t ADT: 483

I 70 ML EBND

Over: STAFFORD GULCH

2.5 MI E OF EAGLE SUMMIT, Summit, CO

Built 1977 Load: 23.0 t ADT: 10,000

I 70 ML EBND

Over: WEST TEN MILE CREEK

@ COPPER MOUNTAIN, Summit, CO

Built 1977 Load: 24.7 t ADT: 10,000

BALD EAGLE ROAD

Over: BLUE RIVER

0.2 MI EAST OF HIGHWAY 9, Summit, CO

Built 2015 Load: 27.5 t ADT: 851

SH 9 ML

Over: BLUE RIVER

13.5 MI NO OF JCT I 70, Summit, CO

Built 1957 Load: 27.9 t ADT: 3,400

I 70 ML WBND

Over: BlueRvr-Adams Ave and...

IN SILVERTHORNE, Summit, CO

Built 1971 Load: 28.9 t ADT: 20,000

SH 9 ML

Over: BLUE RIVER

16.8 MI NO OF JCT I 70, Summit, CO

Built 1961 Load: 29.4 t ADT: 3,200

I 70 ML WBND

Over: FRISCO MAIN STREET

SW END OF FRISCO, Summit, CO

Built 1971 Load: 29.8 t ADT: 13,500

I 70 ML EBND

Over: FRISCO MAIN STREET

SW END OF FRISCO, Summit, CO

Built 1971 Load: 29.8 t ADT: 13,500

Heeney Road

Over: Green Mtn Dam Spillway

26 mi N of Silverthorne, Summit, CO

Built 1942 Load: 32.4 t ADT: 100

MAIN STREET

Over: TEN MILE CREEK

0.1 MI E OF I-70, Summit, CO

Built 1970 Load: 32.4 t ADT: 5,497

WEST KEYSTONE RD.

Over: SNAKE RIVER

0.3 MI S OF HIGHWAY 9, Summit, CO

Built 1972 Load: 32.7 t ADT: 1,640

BOULDER CREEK RD

Over: BOULDER CREEK

0.1 MI W OF STATE HWY 9, Summit, CO

Built 1945 Load: 32.7 t ADT: 43

ADAMS AVENUE

Over: BLUE RIVER

0.1 MI WEST OF MAIN ST, Summit, CO

Built 1992 Load: 32.7 t ADT: 606

SH 9 ML

Over: BLUE RIVER

IN SILVERTHORNE, Summit, CO

Built 1982 Load: 32.7 t ADT: 20,000

CREEKSIDE DRIVE

Over: TEN MILE CREEK

0.1 MI N OF MAIN STREET, Summit, CO

Built 1965 Load: 32.7 t ADT: 548

MADISON AVE

Over: TEN MILE CREEK

0.1 MI N OF MAIN STREET, Summit, CO

Built 1965 Load: 32.7 t ADT: 667

4TH AVE-CREEKSIDE

Over: TEN MILE CREEK

0.2 MI N OF MAIN STREET, Summit, CO

Built 1965 Load: 32.7 t ADT: 980

STEPHENS STREET

Over: STRAIGHT CREEK

NEAR FACTORY OUTLET, Summit, CO

Built 1989 Load: 32.7 t ADT: 8,716

BROKEN LANCE DR

Over: BLUE RIVER

0.5 MI SW OF HIGHWAY 9, Summit, CO

Built 1979 Load: 34.2 t ADT: 925

MONTEZUMA RD CR5

Over: SNAKE RIVER

1 MI NORTH OF MONTEZUMA, Summit, CO

Built 2015 Load: 34.7 t ADT: 401

PARK AVENUE

Over: BLUE RIVER

JUST WEST OF SH 9, Summit, CO

Built 1985 Load: 36.1 t ADT: 10,668

I 70 ML EBND

Over: FARM ACCESS ROAD

1.6 MI E OF JCT US 6 + SH, Summit, CO

Built 1964 Load: 38.5 t ADT: 16,000

WILDERNEST ROAD

Over: BLUE RIVER

.1 MI W OF STATE HWY 9, Summit, CO

Built 1983 Load: 43.1 t ADT: 11,850

SWAN MOUNTAIN RD

Over: BLUE RIVER

.2 MILE EAST OF HIGHWAY 9, Summit, CO

Built 1993 Load: 46.9 t ADT: 3,594

SH 9 ML

Over: TENMILE CREEK

IN FRISCO, Summit, CO

Built 1980 Load: 50.1 t ADT: 24,000

US 6 ML

Over: SNAKE RIVER

5 MI S OF DILLON, Summit, CO

Built 1980 Load: 99.9 t ADT: 8,000

SH 9 ML

Over: BLUE RIVER

0.8 MI S. OF BRECKINGRIDG, Summit, CO

Built 1962 Load: 99.9 t ADT: 8,900

SH 9 ML

Over: BLUE RIVER

11.5 MI NO OF JCT I70, Summit, CO

Built 2002 Load: 11.4 t ADT: 2,800

SH 9 ML

Over: BLUE RIVER

4.1 MI NO OF BRECKENRIDGE, Summit, CO

Built 2013 Load: 25.1 t ADT: 21,000

SH 9 ML

Over: BLUE RIVER

SH 9 OVER BLUE RIVER, Summit, CO

Built 2008 Load: 27.5 t ADT: 20,000

US 6 ML

Over: MONTEZUMA ROAD WBND

AT MONTEZUMA ROAD, Summit, CO

Built 1995 Load: 27.8 t ADT: 1,600

FSR 355.1

Over: SOUTH FORK SWAN

INTERSECTION OF 355.1B, Summit, CO

Built 2003 Load: 30.1 t ADT: 25

REVETT DRIVE

Over: SWAN RIVER

0.1 MI N OF TIGER RD, Summit, CO

Built 1997 Load: 32.7 t ADT: 156

SH 9 ML

Over: PEDESTRIAN UNDERPASS

200 FT S of Peak One Blvd, Summit, CO

Built 2023 Load: 32.7 t ADT: 22,287

I 70 EBND

Over: FOREST SERVICE ROAD

2.6 MI W OF EISENHWR TUNL, Summit, CO

Built 2021 Load: 36.6 t ADT: 36,000

I 70 WBND

Over: FOREST SERVICE ROAD

2.6 MI W OF EISENHWR TUNL, Summit, CO

Built 2021 Load: 37.6 t ADT: 36,000

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

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

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026