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Airline Rd over West Branch Union River

Hancock County, Maine · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Airline Rd over West Branch Union River in Hancock County, Maine, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1973, making it 52 years old at the 2025 inventory.
It carries about 3,693 vehicles a day (traffic count year 2016).
Its listed owner is the state highway agency.
It is one of 36 of the 69 inventoried bridges in Hancock County rated fair (52.2%); 17 (24.6%) are rated poor.
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.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 126 ft
Location	0.7 Mi W of Jct Rte 181
NBI structure number	3138
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Maine department of transportation.

Bridge	Built	Vehicles/day	Condition
Main St over Union River	1923	16,449	Poor
Bangor Rd over Union River	1981	15,759	Fair
Bar Harbor Rd over Mt Desert Narrows	1958	15,122	Fair
Route 1 over Kilkenny St	2000	12,782	Good
Maine Route 233 over Hulls Cove Road	1928	12,768	Fair
Main Rd over M C RR	1973	10,891	Fair