Bridge conditions in Knox County, Maine
54 inventoried bridges · 9 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Knox County has 9 bridges rated poor out of 54 inventoried, a 16.7% share that puts it well above the national rate of about 7%.
- 9 of the 54 bridges in Knox County, Maine, are rated in poor condition (16.7%) in the 2025 National Bridge Inventory, as of .
- 15 bridges (27.8%) are rated good and 30 (55.6%) fair.
- The median Knox County bridge was built in 1960.
- The busiest poor-rated bridge is Main St over Megunticook River (built 1931), carrying about 11,473 vehicles a day.
Good 27.8% · Fair 55.6% · Poor 16.7% of 54 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 |
|---|---|---|---|
| Main St over Megunticook River | 1931 | 11,473 | Poor |
| Heald Hwy over St George River | 1960 | 6,940 | Poor |
| Pascal Av over Goose River | 1951 | 4,760 | Poor |
| Western Rd over Fuller Brook | 1947 | 2,150 | Poor |
| Knowlton St over Megunticook River | 1935 | 1,920 | Poor |
| Main St over Saint George River | 1939 | 846 | Poor |
| Rawson Av over Megunticook River | 1935 | 830 | Poor |
| Razorville Rd over Jackson Str. (davis Str. | 1947 | 340 | Poor |
| Payson Rd over Mill Stream | 1929 | 200 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Main St over Mill Creek | 1924 | 16,917 | Fair |
| Main St over Megunticook River | 1931 | 11,473 | Poor |
| Atlantic Hwy over ST. George River | 1991 | 8,570 | Fair |
| Belfast Rd over Spring Brook | 2025 | 6,960 | Good |
| Heald Hwy over St George River | 1960 | 6,940 | Poor |
| Camden Rd over St George River | 1961 | 5,596 | Fair |
| Rockland Rd over Medomak River | 1931 | 4,890 | Fair |
| Wadsworth St over St.george River | 2016 | 4,779 | Good |
| Pascal Av over Goose River | 1951 | 4,760 | Poor |
| Augusta Rd over Davis Stream | 1932 | 4,410 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Maine: Maine 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.