Bridge conditions in Boundary County, Idaho
84 inventoried bridges · 11 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 8 bridges in Boundary County is rated in poor condition: 11 of 84 on the federal inventory, one of the higher shares in Idaho.
- 11 of the 84 bridges in Boundary County, Idaho, are rated in poor condition (13.1%) in the 2025 National Bridge Inventory, as of .
- 26 bridges (31.0%) are rated good and 47 (56.0%) fair.
- The median Boundary County bridge was built in 1978.
- The busiest poor-rated bridge is S5907;DEEP Crk Lp over Bnrr;uprr & Deep Creek (built 1936), carrying about 900 vehicles a day.
Good 31.0% · Fair 56.0% · Poor 13.1% of 84 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 |
|---|---|---|---|
| S5907;DEEP Crk Lp over Bnrr;uprr & Deep Creek | 1936 | 900 | Poor |
| Stc 5804;WESTSIDE over Myrtle Creek | 1958 | 300 | Poor |
| Fs Route No. 2450 over Blue Joe Creek | 1953 | 50 | Poor |
| Fs Route No 2546 over Blue Joe Creek Upper | 1953 | 50 | Poor |
| Fs Route No. 2798 over Canuck Creek | 1957 | 50 | Poor |
| Fs Route No. 1009 over Grass Creek | 1972 | 50 | Poor |
| Fs Route No. 636 over Grass Creek | 1973 | 50 | Poor |
| Fs Route No. 427 over Boulder CR Callahan | 1961 | 50 | Poor |
| Fs Route No. 211 over Meadow Creek | 1961 | 50 | Poor |
| Fs Route No. 871 over E.f.canuck CR | 1990 | 50 | Poor |
| Ruby Creek Rd over Ruby CREEK(#4) | 1970 | 30 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95 over Bnrr;arizona St. | 1972 | 13,000 | Fair |
| US 95 over Kootenai R;uprr;bnnrs Fy | 1984 | 13,000 | Fair |
| US 95 over Deep Cr;bnrr;uprr;naples | 1965 | 7,300 | Fair |
| US 95 over Deep Creek | 2024 | 6,600 | Good |
| US 95 over Trail Creek | 1965 | 6,300 | Fair |
| US 2 over Uprr;moyie Springs Op | 1965 | 2,600 | Fair |
| US 2 over Moyie R.gorge;moyie Br. | 1965 | 2,600 | Fair |
| S5908;SCHOOLHOUSE over Trail Creek;naples Br | 1964 | 1,200 | Fair |
| US 95 over Wildlife Underpass | 2004 | 1,100 | Fair |
| US 95 over Wildlife Underpass | 2004 | 1,100 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Idaho: Idaho 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.