Columbia County Bridge Report Card

Columbia County scores 46 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F46 / 100

Local infrastructure snapshot

Columbia County, Washington

Columbia County has 86 bridges in the National Bridge Inventory, with 9 rated poor and 9 rated scour-critical. Its poor-condition share of 10.5% is above the 5.6% statewide average. Poor-condition bridges carry about 5,661 daily vehicle crossings.

86Total Bridges

9Poor (10.5%)

39Fair (45.3%)

9Scour-Critical

Quote-Ready Local Facts

10.5%of county bridges are in poor condition, compared with 5.6% statewide and 6.7% nationally.

5,661daily vehicle crossings are on poor-condition bridges in the county.

9bridges are rated scour-critical, or 10.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Columbia County a Bridge Condition Exposure Score of 46/100 (F). The county has 86 bridges in the National Bridge Inventory, including 9 in poor condition and 9 rated scour-critical. Poor-condition bridges carry about 5,661 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	10.5%	20.9
Poor-condition traffic exposure	25	17.1% of measured traffic	12.8
Scour-critical bridge share	20	10.5%	20.0
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	33,134 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	10.5%
State Poor-Condition Share	5.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	10.5%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	5,661 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUS 12 over Warehouse Yard — 2,442 vehicles/day Oldest Listed BridgeThird Street over Patit Creek — built in 1915 All County BridgesBrowse every bridge record in Columbia County.

Top Bridges to Watch in Columbia County

Bridge	Reason	Condition	Daily Traffic	Year Built
Kellog Hollow Rd. over Tucannon River	Poor condition + traffic exposure	Poor	350	1962
Tucannon Road over Tucannon River	Poor condition + traffic exposure	Poor	200	1968
Rose Gulch Road over Touchet River	Poor condition + traffic exposure	Poor	150	1963
US 12 over Warehouse Yard	Poor condition + traffic exposure	Poor	2,442	1933
US 12 over Tucannon River	Poor condition + traffic exposure	Poor	1,884	1967
SR 261 over Snake River	Poor condition + traffic exposure	Poor	485	1927
South Patit Road over South Patit Creek	Poor condition + traffic exposure	Poor	75	1962
Baileysburg Road over North Touchet River	Poor condition + traffic exposure	Poor	50	1975
King Grade over Tucannon River	Poor condition + traffic exposure	Poor	25	1974
US 12 over Touchet River	Scour-critical foundation rating	Good	4,556	1966

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.