Spokane County Bridge Report Card

Spokane 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

Spokane County, Washington

Spokane County has 309 bridges in the National Bridge Inventory, with 21 rated poor and 8 rated scour-critical. Its poor-condition share of 6.8% is above the 5.6% statewide average. Poor-condition bridges carry about 150,731 daily vehicle crossings.

309Total Bridges

21Poor (6.8%)

132Fair (42.7%)

8Scour-Critical

Quote-Ready Local Facts

6.8%of county bridges are in poor condition, compared with 5.6% statewide and 6.7% nationally.

150,731daily vehicle crossings are on poor-condition bridges in the county.

8bridges are rated scour-critical, or 2.6% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Spokane County a Bridge Condition Exposure Score of 77/100 (C). The county has 309 bridges in the National Bridge Inventory, including 21 in poor condition and 8 rated scour-critical. Poor-condition bridges carry about 150,731 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	6.8%	13.6
Poor-condition traffic exposure	25	6.0% of measured traffic	4.5
Scour-critical bridge share	20	2.6%	5.2
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	2,504,540 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	6.8%
State Poor-Condition Share	5.6%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.6%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	150,731 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeSullivan RD over SR 290 (trent Ave) — 21,500 vehicles/day Oldest Listed BridgeMission Avenue over Spokane River — built in 1909 All County BridgesBrowse every bridge record in Spokane County.

Top Bridges to Watch in Spokane County

Bridge	Reason	Condition	Daily Traffic	Year Built
Colbert Road over Little Spokane River	Poor condition + traffic exposure	Poor	2,306	1953
Sullivan RD over SR 290 (trent Ave)	Poor condition + traffic exposure	Poor	21,500	1960
Thor ST over I-90	Poor condition + traffic exposure	Poor	19,798	1957
Greene Street over Spokane River Local Rds	Poor condition + traffic exposure	Poor	17,869	1955
Sunset Boulevard over Latah Creek	Poor condition + traffic exposure	Poor	14,995	1913
I-90 over Medical Lake RD	Poor condition + traffic exposure	Poor	11,409	1966
Sprague Avenue over Sprague Way SB	Poor condition + traffic exposure	Poor	8,658	1954
SR 290 over 2nd AVE	Poor condition + traffic exposure	Poor	7,681	1974
I-90 E-e Ramp over 3rd AVE & I-90	Poor condition + traffic exposure	Poor	7,572	1970
1st Avenue over Maple Street	Poor condition + traffic exposure	Poor	6,261	1958

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.