Structure 5900 · Cumberland County, ME
Carries Casco Bay Bridge over Fore River, Portland - S Portland Tl.
4,748 ft end to end: about 13 football fields. 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 bascule bridge (drawn closed).
| State | Maine |
| County | Cumberland |
| Location | Portland - S Portland Tl |
| Carries | Casco Bay Bridge |
| Crosses | Fore River |
| Coordinates | 43.64504, -70.25789 |
| Material | Steel |
| Design | Movable - Bascule |
| Total Length | 4748.0 ft (1447.2 m) |
| Max Span | 287.1 ft (87.5 m) |
| Deck Width | 86.0 ft (26.2 m) |
| Deck Area | 37916.6 sq m |
| Main Spans | 1 |
| Year Built | 1998 |
| Avg Daily Traffic | 14,893 (2016) |
| Truck Traffic | 5% |
| Lanes On Bridge | 4 |
| Lanes Under Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 5900 |
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.