US Bridges

Belfast RD over Spring Brook

Good

Knox County, Maine · .7 MI S Tl on US 1 · Structure no. 2794

Built
2025
0 years old
Condition
Good
inspected March 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
143 ft
1 main span
Daily traffic
6,960
2016 count
Owner
State
State Highway Agency

About this bridge

Belfast RD over Spring Brook is a steel stringer/multi-beam or girder carrying Belfast RD over Spring Brook in Knox County, Maine. It was built in 2025, so it is 0 years old, younger than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,960 vehicles a day, roughly 5% of them trucks, projected to reach 9,744 by 2036. The structure is 143 ft (43.6 m) long and 37 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesBelfast RD
CrossesSpring Brook
Location.7 MI S Tl on US 1
RouteState Highway 1
CountyKnox County
StateMaine
Coordinates44.23898, -69.03959
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.3 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length143 ft (43.6 m)
Longest span140 ft (42.7 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,960 (2016)
Projected traffic9,744 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Belfast RD over Spring Brook built?

It was built in 2025, making it 0 years old in 2025.

What condition is Belfast RD over Spring Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2025.

How much traffic does Belfast RD over Spring Brook carry?

About 6,960 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Belfast RD over Spring Brook?

The structure is 143 ft (43.6 m) long with a longest span of 140 ft (42.7 m) and a deck 37 ft wide.

Who owns Belfast RD over Spring Brook?

It is owned by the State Highway Agency.