Lake County Bridge Report Card

Lake County scores 57 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F57 / 100

Local infrastructure snapshot

Lake County, California

Lake County has 131 bridges in the National Bridge Inventory, with 12 rated poor and 13 rated scour-critical. Its poor-condition share of 9.2% is above the 4.9% statewide average. Poor-condition bridges carry about 7,878 daily vehicle crossings.

131Total Bridges

12Poor (9.2%)

79Fair (60.3%)

13Scour-Critical

Quote-Ready Local Facts

9.2%of county bridges are in poor condition, compared with 4.9% statewide and 6.7% nationally.

7,878daily vehicle crossings are on poor-condition bridges in the county.

13bridges are rated scour-critical, or 9.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lake County a Bridge Condition Exposure Score of 57/100 (F). The county has 131 bridges in the National Bridge Inventory, including 12 in poor condition and 13 rated scour-critical. Poor-condition bridges carry about 7,878 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	9.2%	18.3
Poor-condition traffic exposure	25	2.3% of measured traffic	1.7
Scour-critical bridge share	20	9.9%	19.8
Average age vs national baseline	10	55 years vs 48 nationally	2.9
Traffic-data completeness	5	344,126 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	9.2%
State Poor-Condition Share	4.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	9.9%
Average Bridge Age	55 years
Poor-Condition Traffic Exposure	7,878 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeNice-lucerne Cutof over Rodman Narrows(clear Lak — 5,315 vehicles/day Oldest Listed BridgeWardlaw ST over Saint Helena Creek — built in 1908 All County BridgesBrowse every bridge record in Lake County.

Top Bridges to Watch in Lake County

Bridge	Reason	Condition	Daily Traffic	Year Built
Elk Mtn RD over West Fork Middle Creek	Poor condition + traffic exposure	Poor	1,000	1966
Big Canyon Road over Big Canyon Creek	Poor condition + traffic exposure	Poor	308	1930
Big Canyon Road over Big Canyon Creek	Poor condition + traffic exposure	Poor	304	1930
Big Canyon RD over Big Canyon Creek	Poor condition + traffic exposure	Poor	208	1956
Road over Stream	Poor condition + traffic exposure	Poor	50	1962
Nice-lucerne Cutof over Rodman Narrows(clear Lak	Poor condition + traffic exposure	Poor	5,315	1958
Road M1 over Eel River	Poor condition + traffic exposure	Poor	350	1971
Elk Mountain RD over Soda Creek	Poor condition + traffic exposure	Poor	169	1979
Bartlett Sprngs RD over Bartlett Creek	Poor condition + traffic exposure	Poor	108	1950
Wolf Creek Road over Wolf Creek	Poor condition + traffic exposure	Poor	26	1967

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.