Bridge conditions in Pine County, Minnesota
172 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
7 of the 172 bridges the federal inventory lists in Pine County are rated poor; the rest split 110 good and 55 fair.
- 7 of the 172 bridges in Pine County, Minnesota, are rated in poor condition (4.1%) in the 2025 National Bridge Inventory, as of .
- 110 bridges (64.0%) are rated good and 55 (32.0%) fair.
- The median Pine County bridge was built in 1989.
- The busiest poor-rated bridge is I 35 over Grindstone River (built 1960), carrying about 8,150 vehicles a day.
Good 64.0% · Fair 32.0% · Poor 4.1% of 172 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 |
|---|---|---|---|
| I 35 over Grindstone River | 1960 | 8,150 | Poor |
| Csah 61 over Snake River | 1976 | 5,576 | Poor |
| Csah 14 over Mission Creek | 1967 | 561 | Poor |
| Csah 46 over Moose Horn River | 1971 | 394 | Poor |
| M 4 over Willow River | 1924 | 80 | Poor |
| Spr 15 over Hay Creek | 1937 | 40 | Poor |
| Spr 18 over Bear Creek | 1936 | 15 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 35 over St Croix Valley RR | 2016 | 11,998 | Good |
| I 35 over St Croix Valley RR | 2016 | 11,998 | Good |
| I 35 over Snake River | 2018 | 10,450 | Good |
| I 35 over Snake River | 2018 | 10,450 | Good |
| I 35 over Mission Creek | 1964 | 8,848 | Fair |
| I 35 over Mission Creek | 1964 | 8,848 | Good |
| Csah 7 over I 35 | 2019 | 8,600 | Good |
| I 35 over Grindstone River | 2024 | 8,150 | Good |
| I 35 over BNSF RR | 2024 | 8,150 | Good |
| I 35 over Grindstone River | 1960 | 8,150 | Poor |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Minnesota: Minnesota 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.