Structure 70 · Androscoggin County, ME
Carries Fair ST over Bobbin Mill Brook, 300 Ft E RT 4.
Set by its lowest-rated component: Deck and Superstructure at 5 of 9.
How ratings work24 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | Maine |
| County | Androscoggin |
| Location | 300 Ft E RT 4 |
| Carries | Fair ST |
| Crosses | Bobbin Mill Brook |
| Coordinates | 44.14461, -70.22573 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 21.3 ft (6.5 m) |
| Deck Width | 26.9 ft (8.2 m) |
| Deck Area | 59.9 sq m |
| Main Spans | 1 |
| Year Built | 1925 (reconstructed 2014) |
| Avg Daily Traffic | 639 (2016) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 7 — Countermeasures installed |
| Structure Number | 0070 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.