California bridge conditions
25,975 inventoried bridges · 1,284 rated poor · county by county
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 1,284 of California's 25,975 inventoried bridges are rated in poor condition (4.9%) in the 2025 National Bridge Inventory, as of .
- 12,239 bridges (47.1%) are rated good and 12,452 (47.9%) fair.
- The national poor rate is about 6.7%; California is at or below it (see all states ranked).
- The busiest poor-rated bridge in the state is Interstate 110 over Slauson Ave & BNSF Ry in Los Angeles County, carrying about 300,000 vehicles a day.
By the measure that matters most - the most traffic on a poor rating - it is Interstate 110 over Slauson Ave & BNSF Ry in Los Angeles County, built 1996, carrying about 300,000 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 47.1% · Fair 47.9% · Poor 4.9% of 25,975 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 California
Frequently asked questions
How many bridges in California are in poor condition?
1,284 of California's 25,975 inventoried highway bridges are rated in poor condition (4.9%) 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 California 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 California DOT.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.