Bridge conditions in San Miguel County, Colorado

59 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory

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

San Miguel County tracks close to typical: 1 of its 59 inventoried bridges (1.7%) are rated poor, against a national rate of about 7%.

• 1 of the 59 bridges in San Miguel County, Colorado, are rated in poor condition (1.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
• 21 bridges (35.6%) are rated good and 37 (62.7%) fair.
• The median San Miguel County bridge was built in 1990.
• The busiest poor-rated bridge is City St - Mahoney over San Miguel River (built 1995), carrying about 833 vehicles a day.

Good 35.6% · Fair 62.7% · Poor 1.7% of 59 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.

Busiest bridges in the county

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.