Cowlitz County Bridge Report Card

Cowlitz County scores 77 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C77 / 100

Local infrastructure snapshot

Cowlitz County, Washington

Cowlitz County has 161 bridges in the National Bridge Inventory, with 6 rated poor and 9 rated scour-critical. Its poor-condition share of 3.7% is at or below the 5.6% statewide average. Poor-condition bridges carry about 50,789 daily vehicle crossings.

161Total Bridges

6Poor (3.7%)

80Fair (49.7%)

9Scour-Critical

Quote-Ready Local Facts

3.7%of county bridges are in poor condition, compared with 5.6% statewide and 6.7% nationally.

50,789daily vehicle crossings are on poor-condition bridges in the county.

9bridges are rated scour-critical, or 5.6% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Cowlitz County a Bridge Condition Exposure Score of 77/100 (C). The county has 161 bridges in the National Bridge Inventory, including 6 in poor condition and 9 rated scour-critical. Poor-condition bridges carry about 50,789 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	3.7%	7.5
Poor-condition traffic exposure	25	4.0% of measured traffic	3.0
Scour-critical bridge share	20	5.6%	11.2
Average age vs national baseline	10	51 years vs 48 nationally	1.3
Traffic-data completeness	5	1,281,840 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	3.7%
State Poor-Condition Share	5.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	5.6%
Average Bridge Age	51 years
Poor-Condition Traffic Exposure	50,789 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-5 over Log Dump RD & Bn Ry — 33,912 vehicles/day Oldest Listed BridgeSR 411 over Burlington Northern Rr — built in 1922 All County BridgesBrowse every bridge record in Cowlitz County.

Top Bridges to Watch in Cowlitz County

Bridge	Reason	Condition	Daily Traffic	Year Built
I-5 over Log Dump RD & Bn Ry	Poor condition + traffic exposure	Poor	33,912	1972
SR 411 over Cowlitz River	Poor condition + traffic exposure	Poor	6,753	1963
Old 99 South over Owl Creek	Poor condition + traffic exposure	Poor	6,500	1922
SR 503 over Jim Creek	Poor condition + traffic exposure	Poor	1,969	1945
SR 504 over N Fk Toutle River	Poor condition + traffic exposure	Poor	955	1965
Mill Creek RD over Mill Creek	Poor condition + traffic exposure	Poor	700	1958
SR 433 over Columbia R @ Longview	Scour-critical foundation rating	Fair	20,432	1929
Talley Way over Coweeman River	Scour-critical foundation rating	Fair	5,285	1961
SR 4 over Abernathy Creek	Scour-critical foundation rating	Fair	4,787	1930
Ostrander RD over Ostrander Creek	Scour-critical foundation rating	Fair	1,600	1962

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.