Modoc County Bridge Report Card

Modoc County scores 91 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A91 / 100

Local infrastructure snapshot

Modoc County, California

Modoc County has 87 bridges in the National Bridge Inventory, with 1 rated poor and 1 rated scour-critical. Its poor-condition share of 1.1% is at or below the 4.9% statewide average. Poor-condition bridges carry about 1,200 daily vehicle crossings.

87Total Bridges

1Poor (1.1%)

43Fair (49.4%)

1Scour-Critical

Quote-Ready Local Facts

1.1%of county bridges are in poor condition, compared with 4.9% statewide and 6.7% nationally.

1,200daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 1.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Modoc County a Bridge Condition Exposure Score of 91/100 (A). The county has 87 bridges in the National Bridge Inventory, including 1 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,200 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	1.1%	2.3
Poor-condition traffic exposure	25	1.9% of measured traffic	1.4
Scour-critical bridge share	20	1.1%	2.3
Average age vs national baseline	10	56 years vs 48 nationally	3.3
Traffic-data completeness	5	63,230 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	1.1%
State Poor-Condition Share	4.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.1%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	1,200 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeState Route 299 over Pit River — 1,200 vehicles/day Oldest Listed BridgeCounty Road 75 over Pit River — built in 1919 All County BridgesBrowse every bridge record in Modoc County.

Top Bridges to Watch in Modoc County

Bridge	Reason	Condition	Daily Traffic	Year Built
State Route 299 over Pit River	Poor condition + traffic exposure	Poor	1,200	1962
Centerville RD over South Branch Pit River	Scour-critical foundation rating	Good	245	1958
U.s. Highway 395 over Parker Creek	High traffic	Fair	4,000	1954
U.s. Highway 395 over North Fork Pit River	High traffic	Fair	4,000	1982
State Route 299 over Rattlesnake Creek	High traffic	Good	3,000	1980
State Route 299 over Rock Creek	High traffic	Good	2,800	1937
U.s. Highway 395 over South Fork Pit River	High traffic	Fair	2,400	1971
U.s. Highway 395 over South Fork Pit River	High traffic	Good	2,400	1971
U.s. Highway 395 over Up Rr	High traffic	Fair	2,400	1971
U.s. Highway 395 over Up Rr	High traffic	Fair	2,400	1971

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.