Blagg Lane over Grass Valley Canyon
Sherman County, Oregon · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Blagg Lane over Grass Valley Canyon in Sherman County, Oregon, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1957, making it 68 years old at the 2025 inventory.
- It carries about 301 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 2 of the 48 inventoried bridges in Sherman County rated poor (4.2%); 2 (4.2%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- It was rated fair in the 2024 inventory and is now poor (culvert 6 to 4).
- Its most recent inspection on record is dated August 2024, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (45.36287, -120.78244)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 4 | Poor condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 22 ft |
| Location | 0.03 Mi E of Hwy 97 |
| NBI structure number | 18017 000000000 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Sherman County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-84 (hwy 002) over Deschutes River | 1964 | 16,485 | Fair |
| I-84 (hwy 002) over Spanish Hollow Creek | 1964 | 14,294 | Fair |
| I-84 (hwy 002) over Conn Rd | 1963 | 14,253 | Good |
| I-84 (hwy 002) over Helms Creek | 1964 | 14,253 | Good |
| US 97 (hwy 042) over UPRR | 2014 | 9,754 | Good |
| US 97 (hwy 042) over I-84 (hwy 002) | 2014 | 9,754 | Good |
All bridges nearby: Sherman County, OR bridge conditions · every bridge in Sherman County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.