SR 171 over I-90
Grant County, Washington · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 171 over I-90 in Grant County, Washington, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2001, making it 24 years old at the 2025 inventory.
- It carries about 11,072 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 195 of the 304 inventoried bridges in Grant County rated good (64.1%); 9 (3.0%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (47.10092, -119.31647)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 222 ft |
| Location | Jct I-90 |
| NBI structure number | 0015898A0000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.
Busiest bridges in Grant 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 |
All bridges nearby: Grant County, WA bridge conditions · every bridge in Grant County · Washington bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.