Knowlton Mills Rd over Black Stream
Piscataquis County, Maine · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Knowlton Mills Rd over Black Stream in Piscataquis County, Maine, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1968, making it 57 years old at the 2025 inventory.
- It carries about 92 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 47 of the 80 inventoried bridges in Piscataquis County rated fair (58.8%); 17 (21.2%) 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 October 2023, on a 24-month routine inspection cycle.
- 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 → (45.16025, -69.28185)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 33 ft |
| Location | 50 Ft SW Burrough Rd |
| NBI structure number | 0952 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maine department of transportation.
Busiest bridges in Piscataquis County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| E Main St over Piscataquis River | 1912 | 10,496 | Poor |
| W Main St over Sebec River | 1931 | 6,037 | Poor |
| Main St over Sebec River | 1915 | 6,037 | Poor |
| Main St over Sebec River | 1915 | 6,037 | Poor |
| W Main St over Sebec River | 1924 | 6,037 | Fair |
| S Main St over Piscataquis River | 1954 | 5,955 | Fair |
All bridges nearby: Piscataquis County, ME bridge conditions · every bridge in Piscataquis County · Maine bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.