Alpine County Bridge Report Card

Alpine County scores 81 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B81 / 100

Local infrastructure snapshot

Alpine County, California

Alpine County has 33 bridges in the National Bridge Inventory, with 2 rated poor and 0 rated scour-critical. Its poor-condition share of 6.1% is above the 4.9% statewide average. Poor-condition bridges carry about 815 daily vehicle crossings.

33Total Bridges

2Poor (6.1%)

21Fair (63.6%)

0Scour-Critical

Quote-Ready Local Facts

6.1%of county bridges are in poor condition, compared with 4.9% statewide and 6.7% nationally.

815daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Alpine County a Bridge Condition Exposure Score of 81/100 (B). The county has 33 bridges in the National Bridge Inventory, including 2 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 815 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	6.1%	12.1
Poor-condition traffic exposure	25	2.2% of measured traffic	1.7
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	61 years vs 48 nationally	5.3
Traffic-data completeness	5	36,703 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	6.1%
State Poor-Condition Share	4.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	61 years
Poor-Condition Traffic Exposure	815 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeState Route 4 over Silver Creek — 540 vehicles/day Oldest Listed BridgeState Route 89 over Markleeville Creek — built in 1929 All County BridgesBrowse every bridge record in Alpine County.

Top Bridges to Watch in Alpine County

Bridge	Reason	Condition	Daily Traffic	Year Built
State Route 4 over Silver Creek	Poor condition + traffic exposure	Poor	540	1952
Crystal Sprgs Camp over West Fork Carson River	Poor condition + traffic exposure	Poor	275	1938
State Route 88 over West Fork Carson River	High traffic	Fair	3,225	1952
Old State Route 88 over West Fork Carson River	High traffic	Fair	3,200	1939
State Route 89 over West Fork Carson River	High traffic	Fair	3,200	1960
State Route 88 over West Fork Carson River	High traffic	Good	3,200	1963
State Route 88 over West Fork Carson River	High traffic	Good	3,200	1963
State Route 89 over Wildlife Access	High traffic	Good	3,050	1980
State Route 88 over Caples Lake Spillway	High traffic	Fair	2,800	1987
State Route 88 over West Fork Carson River	High traffic	Fair	2,200	1939

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.