Lewis County Bridge Report Card

Lewis County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D63 / 100

Local infrastructure snapshot

Lewis County, Washington

Lewis County has 420 bridges in the National Bridge Inventory, with 17 rated poor and 56 rated scour-critical. Its poor-condition share of 4.0% is at or below the 5.6% statewide average. Poor-condition bridges carry about 83,350 daily vehicle crossings.

420Total Bridges

17Poor (4.0%)

194Fair (46.2%)

56Scour-Critical

Quote-Ready Local Facts

4.0%of county bridges are in poor condition, compared with 5.6% statewide and 6.7% nationally.

83,350daily vehicle crossings are on poor-condition bridges in the county.

56bridges are rated scour-critical, or 13.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lewis County a Bridge Condition Exposure Score of 63/100 (D). The county has 420 bridges in the National Bridge Inventory, including 17 in poor condition and 56 rated scour-critical. Poor-condition bridges carry about 83,350 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	4.0%	8.1
Poor-condition traffic exposure	25	7.2% of measured traffic	5.4
Scour-critical bridge share	20	13.3%	20.0
Average age vs national baseline	10	56 years vs 48 nationally	3.2
Traffic-data completeness	5	1,151,482 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	4.0%
State Poor-Condition Share	5.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	13.3%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	83,350 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-5 over Cowlitz River — 21,828 vehicles/day Oldest Listed BridgeFas 1027 over China Creek — built in 1911 All County BridgesBrowse every bridge record in Lewis County.

Top Bridges to Watch in Lewis County

Bridge	Reason	Condition	Daily Traffic	Year Built
I-5 over Cowlitz River	Poor condition + traffic exposure	Poor	21,828	1953
US 12 over Coal Creek	Poor condition + traffic exposure	Poor	2,494	1930
SR 7 over Tilton River	Poor condition + traffic exposure	Poor	2,351	1931
I-5 over Lacamas CR Drews Pr RD	Poor condition + traffic exposure	Poor	21,041	1953
Chamber Way over Bn Rr & N Natl AVE	Poor condition + traffic exposure	Poor	13,223	1952
SR 507 over Skookumchuck River	Poor condition + traffic exposure	Poor	8,908	1928
SR 7 over S Fk Tilton River	Poor condition + traffic exposure	Poor	2,625	1938
SR 7 over Abandoned Railroad	Poor condition + traffic exposure	Poor	2,625	1944
US 12 over Purcell Creek	Poor condition + traffic exposure	Poor	2,452	1971
US 12 over Clear Fk Of Cowlitz R	Poor condition + traffic exposure	Poor	2,452	1972

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.