Colorado bridge conditions
8,990 inventoried bridges · 417 rated poor · county by county
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 417 of Colorado's 8,990 inventoried bridges are rated in poor condition (4.6%) in the 2025 National Bridge Inventory, as of .
- 3,035 bridges (33.8%) are rated good and 5,538 (61.6%) fair.
- The national poor rate is about 6.7%; Colorado is at or below it (see all states ranked).
- The busiest poor-rated bridge in the state is I 225 Ml over Goldsmith Gulch in Denver County, carrying about 128,000 vehicles a day.
By the measure that matters most - the most traffic on a poor rating - it is I 225 Ml over Goldsmith Gulch in Denver County, built 1971, carrying about 128,000 vehicles a day. That is a repair-priority flag, not a collapse warning: what a poor rating does and does not mean. See the worst bridge in every state.
Good 33.8% · Fair 61.6% · Poor 4.6% of 8,990 bridges
Bridge conditions by county
Sorted by the number of poor-rated bridges. Click any county for its full bridge list.
The 25 busiest poor-rated bridges in Colorado
Frequently asked questions
How many bridges in Colorado are in poor condition?
417 of Colorado's 8,990 inventoried highway bridges are rated in poor condition (4.6%) in the 2025 National Bridge Inventory. 'Poor' is FHWA's classification for a bridge whose deck, superstructure, or substructure is rated 4 or lower on the 0-9 scale; it was formerly called 'structurally deficient'.
Are the poor-rated bridges in Colorado safe to drive on?
A poor rating flags advanced deterioration that needs repair or close monitoring; it does not by itself mean a bridge is unsafe. Bridges judged unsafe are closed or restricted to lighter loads by the owner. Inspections continue on all open bridges, generally at least every 24 months under the National Bridge Inspection Standards.
Source: FHWA National Bridge Inventory, 2025 vintage, reported by the Colorado DOT.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.