Walla Walla County Bridge Report Card
Walla Walla County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Walla Walla County, Washington
Walla Walla County has 195 bridges in the National Bridge Inventory, with 18 rated poor and 7 rated scour-critical. Its poor-condition share of 9.2% is above the 5.6% statewide average. Poor-condition bridges carry about 22,202 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Walla Walla County a Bridge Condition Exposure Score of 70/100 (C). The county has 195 bridges in the National Bridge Inventory, including 18 in poor condition and 7 rated scour-critical. Poor-condition bridges carry about 22,202 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 9.2% | 18.5 |
| Poor-condition traffic exposure | 25 | 5.3% of measured traffic | 4.0 |
| Scour-critical bridge share | 20 | 3.6% | 7.2 |
| Average age vs national baseline | 10 | 46 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 418,119 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 | 9.2% |
| State Poor-Condition Share | 5.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.6% |
| Average Bridge Age | 46 years |
| Poor-Condition Traffic Exposure | 22,202 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Walla Walla County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Mill Creek RD over Mill Creek | Poor condition + traffic exposure | Poor | 380 | 1981 |
| Pettyjohn RD over Touchet River | Poor condition + traffic exposure | Poor | 100 | 1914 |
| Seven Mile RD over Mill Creek | Poor condition + traffic exposure | Poor | 50 | 2020 |
| US 12 over Nine Mile CR & Rr | Poor condition + traffic exposure | Poor | 8,140 | 1933 |
| US 12 over WB Off Ramp | Poor condition + traffic exposure | Poor | 4,350 | 1971 |
| 4th ST over Mill Creek | Poor condition + traffic exposure | Poor | 2,624 | 1908 |
| 5th ST over Mill Creek | Poor condition + traffic exposure | Poor | 1,970 | 1916 |
| 6th ST over Mill Creek | Poor condition + traffic exposure | Poor | 1,970 | 1920 |
| Wallula AVE over Mill Creek | Poor condition + traffic exposure | Poor | 948 | 1947 |
| Stateline RD (2) over Pine Creek | Poor condition + traffic exposure | Poor | 545 | 1964 |
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.