Mendocino County Bridge Report Card

Mendocino County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C70 / 100

Local infrastructure snapshot

Mendocino County, California

Mendocino County has 356 bridges in the National Bridge Inventory, with 27 rated poor and 17 rated scour-critical. Its poor-condition share of 7.6% is above the 4.9% statewide average. Poor-condition bridges carry about 38,739 daily vehicle crossings.

356Total Bridges

27Poor (7.6%)

205Fair (57.6%)

17Scour-Critical

Quote-Ready Local Facts

7.6%of county bridges are in poor condition, compared with 4.9% statewide and 6.7% nationally.

38,739daily vehicle crossings are on poor-condition bridges in the county.

17bridges are rated scour-critical, or 4.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Mendocino County a Bridge Condition Exposure Score of 70/100 (C). The county has 356 bridges in the National Bridge Inventory, including 27 in poor condition and 17 rated scour-critical. Poor-condition bridges carry about 38,739 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	7.6%	15.2
Poor-condition traffic exposure	25	2.6% of measured traffic	1.9
Scour-critical bridge share	20	4.8%	9.6
Average age vs national baseline	10	56 years vs 48 nationally	3.4
Traffic-data completeness	5	1,508,836 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	7.6%
State Poor-Condition Share	4.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	4.8%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	38,739 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeN State ST over York Creek — 7,012 vehicles/day Oldest Listed BridgeLaytnvlle-dos Rios over Burger Creek — built in 1888 All County BridgesBrowse every bridge record in Mendocino County.

Top Bridges to Watch in Mendocino County

Bridge	Reason	Condition	Daily Traffic	Year Built
Moore AVE over West Branch Russian Riv	Poor condition + traffic exposure	Poor	2,776	1958
Lambert Lane over Robinson Creek	Poor condition + traffic exposure	Poor	379	1954
State Park Road over Little River	Poor condition + traffic exposure	Poor	150	1951
Sherwood RD over Sherwood Creek	Poor condition + traffic exposure	Poor	137	1979
Gualala Road over North Fork Gualala River	Poor condition + traffic exposure	Poor	97	1940
Reynolds Highway over Outlet Creek	Poor condition + traffic exposure	Poor	19	1955
N State ST over York Creek	Poor condition + traffic exposure	Poor	7,012	1980
U.s. Highway 101 over Long Valley Creek	Poor condition + traffic exposure	Poor	6,750	1960
U.s. Highway 101 over Long Valley Creek	Poor condition + traffic exposure	Poor	6,700	1957
North Bush Street over Orrs Creek	Poor condition + traffic exposure	Poor	4,692	1972

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.