Bridge conditions in Grant County, Washington
304 inventoried bridges · 9 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Grant County tracks close to typical: 9 of its 304 inventoried bridges (3.0%) are rated poor, against a national rate of about 7%.
- 9 of the 304 bridges in Grant County, Washington, are rated in poor condition (3.0%) in the 2025 National Bridge Inventory, as of .
- 195 bridges (64.1%) are rated good and 100 (32.9%) fair.
- The median Grant County bridge was built in 1967.
- The busiest poor-rated bridge is I-90 over West Canal (built 1964), carrying about 5,896 vehicles a day.
Good 64.1% · Fair 32.9% · Poor 3.0% of 304 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-90 over West Canal | 1964 | 5,896 | Poor |
| I-90 over West Canal | 1964 | 5,896 | Poor |
| Hansen Rd over I-90 | 1958 | 4,835 | Poor |
| M Road SE over EL 29 Waste Way | 1980 | 2,094 | Poor |
| Adams Rd over I-90 | 1958 | 1,465 | Poor |
| So. Frontage Rd. over West Canal | 1950 | 687 | Poor |
| Beverly Burke Rd over I-90 | 1964 | 574 | Poor |
| Farm Access over West Canal Lateral W26C | 1994 | 20 | Poor |
| Mi 2.8 Thompson over Rocky Coulee Wasteway | 1950 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Alder Street over Parker Horn | 1958 | 29,630 | Fair |
| SR 17 over I-90 Ramp | 1958 | 16,352 | Fair |
| Stratford Rd over SR 17 | 1966 | 14,235 | Fair |
| I-90 over Moses Lake | 1958 | 13,711 | Fair |
| I-90 over Moses Lake | 1958 | 13,711 | Fair |
| SR 17 over Parker Horn | 1955 | 11,733 | Good |
| SR 171 over I-90 | 2001 | 11,072 | Good |
| SR 28 over Irrigation Canal | 1952 | 10,968 | Fair |
| I-90 over Pelican Horn | 1957 | 10,080 | Fair |
| I-90 over Pelican Horn | 1958 | 10,080 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Washington: Washington bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.