Home › Colorado › Lake County

Bridge conditions in Lake County, Colorado

17 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory

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

About one in 8 bridges in Lake County is rated in poor condition: 2 of 17 on the federal inventory, one of the higher shares in Colorado.

2 of the 17 bridges in Lake County, Colorado, are rated in poor condition (11.8%) in the 2025 National Bridge Inventory, as of August 20, 2026.
9 bridges (52.9%) are rated good and 6 (35.3%) fair.
The median Lake County bridge was built in 1993.
The busiest poor-rated bridge is SH 300 Ml over California Gulch (built 1939), carrying about 1,600 vehicles a day.

Good 52.9% · Fair 35.3% · Poor 11.8% of 17 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
SH 300 Ml over California Gulch	1939	1,600	Poor
SH 300 Ml over Lake Fork Creek	1954	120	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 24 Ml over California Gulch	2013	4,600	Good
US 24 Ml over Lake Creek	1993	4,200	Good
US 24 Ml over UP RR	1995	4,200	Good
US 24 Ml over Arkansas River	1995	4,200	Fair
US 24 Ml over Draw	1937	4,000	Fair
US 24 Ml over East Fork Arkansas River	2008	2,700	Good
SH 82 Ml over Lake Creek	1948	2,200	Fair
US 24 Ml over UP RR	2011	1,600	Good
SH 300 Ml over Arkansas River	1939	1,600	Fair
SH 300 Ml over California Gulch	1939	1,600	Poor

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.