Grant County Bridge Report Card
Grant County scores 87 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Grant County, Washington
Grant County has 304 bridges in the National Bridge Inventory, with 9 rated poor and 3 rated scour-critical. Its poor-condition share of 3.0% is at or below the 5.6% statewide average. Poor-condition bridges carry about 21,477 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Grant County a Bridge Condition Exposure Score of 87/100 (B). The county has 304 bridges in the National Bridge Inventory, including 9 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 21,477 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 | 3.0% | 5.9 |
| Poor-condition traffic exposure | 25 | 4.7% of measured traffic | 3.5 |
| Scour-critical bridge share | 20 | 1.0% | 2.0 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 1.9 |
| Traffic-data completeness | 5 | 459,691 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 | 3.0% |
| State Poor-Condition Share | 5.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.0% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 21,477 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Grant County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| I-90 over West Canal | Poor condition + traffic exposure | Poor | 5,896 | 1964 |
| I-90 over West Canal | Poor condition + traffic exposure | Poor | 5,896 | 1964 |
| Hansen RD over I-90 | Poor condition + traffic exposure | Poor | 4,835 | 1958 |
| M Road SE over El 29 Waste Way | Poor condition + traffic exposure | Poor | 2,094 | 1980 |
| Adams RD over I-90 | Poor condition + traffic exposure | Poor | 1,465 | 1958 |
| So. Frontage Rd. over West Canal | Poor condition + traffic exposure | Poor | 687 | 1950 |
| Beverly Burke RD over I-90 | Poor condition + traffic exposure | Poor | 574 | 1964 |
| Farm Access over West Canal Lateral W26c | Poor condition + traffic exposure | Poor | 20 | 1994 |
| Mi 2.8 Thompson over Rocky Coulee Wasteway | Poor condition + traffic exposure | Poor | 10 | 1950 |
| SR 17 over Lind Coulee | Scour-critical foundation rating | Fair | 9,298 | 1954 |
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.