Hwy 171 over Clack Rvr. (Cripple Cr.)
Clackamas County, Oregon · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Hwy 171 over Clack Rvr. (Cripple Cr.) in Clackamas County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1952, making it 73 years old at the 2025 inventory.
- It carries about 299 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 237 of the 367 inventoried bridges in Clackamas County rated fair (64.6%); 17 (4.6%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (45.11619, -122.07516)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel through truss |
| Length | about 266 ft |
| Location | 22.3 Mi SE Estacada |
| NBI structure number | 08990 171 04583 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Clackamas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Barlow Trail Rd over Hackett Creek | 1965 | 165,900 | Fair |
| Hwy 001 over Willamette River | 1953 | 127,233 | Fair |
| Boones Ferry Road over I-5 (Hwy 1) | 1971 | 127,233 | Fair |
| Strawberry Lane over Hwy 064 | 1962 | 113,512 | Good |
| Boeckman Road over I-5 (hwy 001) | 1969 | 110,869 | Fair |
| Hwy 064 over Main St | 1972 | 108,786 | Fair |
All bridges nearby: Clackamas County, OR bridge conditions · every bridge in Clackamas County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.