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County Road M over Rio San Antonio

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

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

County Road M over Rio San Antonio in Conejos County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1980, making it 45 years old at the 2025 inventory.
It carries about 82 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 32 of the 63 inventoried bridges in Conejos County rated fair (50.8%); 8 (12.7%) 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	Continuous steel stringer or multi-beam girder
Length	about 80 ft
Location	1.5 Mi NE of CR 19
NBI structure number	CON07.4E-05.0N
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 285 Ml over Alamosa Creek	1959	5,200	Fair
US 285 Ml over La Jara Creek	1959	5,200	Good
US 285 Ml over Conejos Riv.overflow	1929	3,200	Poor
US 285 Ml over Conejos River	1929	3,200	Fair
SH 15 Ml over La Jara Creek	1938	1,300	Fair
US 285 Ml over Rio San Antonio	1938	1,200	Fair