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Bridge conditions in Jefferson County, Colorado

468 inventoried bridges · 30 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

The federal inventory lists 468 bridges in Jefferson County: 159 rated good, 279 fair, and 30 poor.

30 of the 468 bridges in Jefferson County, Colorado, are rated in poor condition (6.4%) in the 2025 National Bridge Inventory, as of August 20, 2026.
159 bridges (34.0%) are rated good and 279 (59.6%) fair.
The median Jefferson County bridge was built in 1985.
The busiest poor-rated bridge is US 6 Ml over SH 121 Ml (built 1972), carrying about 101,000 vehicles a day.

Good 34.0% · Fair 59.6% · Poor 6.4% of 468 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
US 6 Ml over SH 121 Ml	1972	101,000	Poor
I 70 Ml Wbnd over SH 391 Ml	1967	57,000	Poor
I 70 Ml Ebnd over SH 391 Ml	1967	57,000	Poor
I 70 WB Ramp over US 6 Ml	1969	53,000	Poor
I 70 Ml Wbnd over West 20TH Ave	1968	45,500	Poor
I 76 Ml Wbnd over Clear Creek	1984	38,000	Poor
I 76 Ml Ebnd over Clear Creek	1984	38,000	Poor
I 76 Ml Ebnd over Marshall Street	1980	38,000	Poor
I 76 Ml Wbnd over Marshall Street	1980	38,000	Poor
I 76 Ml Ebnd over Ramp to SH 121 Ml	1982	38,000	Poor
I 76 Ml Wbnd over Ramp to SH 121 Ml	1982	38,000	Poor
I 76 Ml Ebnd over I 70 Ml Wbnd	1982	38,000	Poor
SH 391 Ml over Clear Creek	1969	37,000	Poor
I 70 Ml Wbnd over County Rd. 93	1969	35,000	Poor
I 70 Ml Wbnd over US 40 Ml	1969	35,000	Poor
I 70 Ml Ebnd over Moss Street W 7TH Ave	1969	35,000	Poor
Ramp to I 70 Ebnd over I 70 Ml R	1968	17,000	Poor
Ward Road over Ralston Creek	1969	15,435	Poor
Mcintyre Street over SH 58 Ml	1973	14,684	Poor
Lookout Mountain R over I 70 Ml	1970	6,252	Poor
Kentucky Avenue over Weir Gulch	1970	5,467	Poor
Olde Wadsworth Bou over Ralston Creek	1983	3,557	Poor
Youngfield Court over Local Drainage	1975	1,460	Poor
Center Avenue over Drainage	1942	1,100	Poor
North Avenue over Drainage	1942	1,100	Poor
State Highway 67 over South Platte River	1990	725	Poor
Avenue F over Bear Creek	1987	540	Poor
US 40 Ml over Beaver Brook	1937	480	Poor
Soda Lakes Road over Bear Creek	1938	291	Poor
Park Avenue over Bear Creek	1926	220	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I 70 Ml over Garrison Street	1967	118,000	Fair
I 70 Ml over Carr Street	1967	118,000	Fair
I 70 Ml over SH 121 Ml	1996	118,000	Fair
US 6 Ml over SH 95 Ml/sheridan Ave.	2011	114,000	Good
I-70 Ml over SH 72 Ml/ward Road	2024	112,000	Good
I70 Ml over Light Rail	2010	106,000	Fair
I70 Ml over 40TH Ave.	2009	104,000	Good
US 6 Ml over Mcintyre Gulch	1942	101,000	Fair
US 6 Ml over SH 121 Ml	1972	101,000	Poor
US 6 Ml over Garrison Street	2015	100,000	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of Colorado: Colorado bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.