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County Road 21 over Animas River

San Juan County, Colorado · rated Fair in the 2025 National Bridge Inventory

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

County Road 21 over Animas River in San Juan County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1989, making it 36 years old at the 2025 inventory.
It carries about 81 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 7 of the 12 inventoried bridges in San Juan County rated fair (58.3%); 1 (8.3%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 61 ft
Location	2.9 Mi NE of Silverton
NBI structure number	SJN21-00.2A
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.

Bridge	Built	Vehicles/day	Condition
US 550 Ml over Mineral Creek	2011	1,900	Good
US 550 Ml over Cascade Creek	1949	1,900	Fair
County Road 2 over Cunningham Creek	1989	997	Fair
County Road 2 over Animas River	1988	920	Fair
Greene Street over Cement Creek	1929	647	Poor
14TH Street over Cement Creek	1993	647	Fair