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County Road 346 over Mamm Creek

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

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

County Road 346 over Mamm Creek in Garfield 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1999, making it 26 years old at the 2025 inventory.
It carries about 1,308 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 119 of the 167 inventoried bridges in Garfield County rated fair (71.3%); 2 (1.2%) 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

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

Bridge	Built	Vehicles/day	Condition
I 70 Ml over Canyon Creek	1971	33,000	Fair
SH 82 Ml over I 70 Ml Colorado River	2017	29,000	Good
I 70 Ml over SH 82 Ml	1970	24,000	Fair
SH 82 Ml over Cattle Creek	1967	23,000	Good
I 70 Ml+front Rd over Allenwater Creek	1982	20,000	Fair
I 70 Ml Wbnd over County Road 134	1969	16,500	Fair