SH 11 over Quartz Creek;three Mile
Clearwater County, Idaho · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 11 over Quartz Creek;three Mile in Clearwater County, Idaho, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1972, making it 53 years old at the 2025 inventory.
- It carries about 210 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 44 of the 88 inventoried bridges in Clearwater County rated fair (50.0%); 6 (6.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (46.5128, -115.8158)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 40 ft |
| Location | 1.8 N. Pierce |
| NBI structure number | 000000000010335 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Idaho department of transportation.
Busiest bridges in Clearwater County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 7 over Clearwater River | 1998 | 7,800 | Fair |
| STC4782;GRANGEMONT over Whiskey Cr.;orofino CR. | 1951 | 2,800 | Fair |
| SH 7 over N.fk. Clearwater River | 1999 | 2,100 | Fair |
| Stc 4786;JOHNSON over Orofino Creek | 1978 | 2,000 | Good |
| STC4782;GRANGEMONT over Whiskey Creek;stanton Br | 1954 | 1,900 | Good |
| SH 8 over Ruby Creek | 1976 | 1,000 | Fair |
All bridges nearby: Clearwater County, ID bridge conditions · every bridge in Clearwater County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.