Missouri bridge conditions
24,647 inventoried bridges · 2,163 rated poor · county by county
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 2,163 of Missouri's 24,647 inventoried bridges are rated in poor condition (8.8%) in the 2025 National Bridge Inventory, as of .
- 9,180 bridges (37.2%) are rated good and 13,304 (54.0%) fair.
- The national poor rate is about 6.7%; Missouri is above it (see all states ranked).
- The busiest poor-rated bridge in the state is Is 270 E over Cst Conway Rd in St. Louis County, carrying about 182,944 vehicles a day.
By the measure that matters most - the most traffic on a poor rating - it is Is 270 E over Cst Conway Rd in St. Louis County, built 1964, carrying about 182,944 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 37.2% · Fair 54.0% · Poor 8.8% of 24,647 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 Missouri
Frequently asked questions
How many bridges in Missouri are in poor condition?
2,163 of Missouri's 24,647 inventoried highway bridges are rated in poor condition (8.8%) 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 Missouri 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 Missouri DOT.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.