Mill St over Harrington River
Washington County, Maine · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mill St over Harrington River in Washington County, Maine, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1931, making it 94 years old at the 2025 inventory.
- It carries about 421 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 22 of the 111 inventoried bridges in Washington County rated poor (19.8%); 22 (19.8%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (44.61779, -67.81155)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 34 ft |
| Location | .13 Mi Sly of US 1 Jct |
| NBI structure number | 2478 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maine department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Dublin St over Machias River | 2004 | 11,740 | Good |
| Dublin St over Machias River | 2004 | 11,740 | Good |
| Dublin St over Mchias River | 2004 | 11,740 | Good |
| Main St over Middle River | 1930 | 9,731 | Poor |
| Houlton Rd over Stoney Brook | 2009 | 4,702 | Good |
| Bridge St over Narraguagus River | 2008 | 4,658 | Good |
All bridges nearby: Washington County, ME bridge conditions · every bridge in Washington County · Maine bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.