US Bridges

US 4 over Bellamy River

Good

Strafford County, New Hampshire · 0.1 MI from JCT RTE 16 · Structure no. 006501740003400

Built
1998
27 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,139 ft
13 main spans
Daily traffic
19,707
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Bellamy River is a prestressed concrete stringer/multi-beam or girder carrying US 4 over Bellamy River in Strafford County, New Hampshire. It was built in 1998, so it is 27 years old, younger than the New Hampshire average of 56.9 years.

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

It carries about 19,707 vehicles a day, roughly 7% of them trucks, projected to reach 29,166 by 2043. The structure is 1,139 ft (347.1 m) long and 67 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS 4
CrossesBellamy River
Location0.1 MI from JCT RTE 16
RouteU.S. Route 4
Coordinates43.12927, -70.84885
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating46 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans13
Design loadHS 25 or greater
Structure length1,139 ft (347.1 m)
Longest span90 ft (27.4 m)
Deck width67 ft (20.3 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,707 (2023)
Projected traffic29,166 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 4 over Bellamy River built?

It was built in 1998, making it 27 years old in 2025.

What condition is US 4 over Bellamy River 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 April 2023.

How much traffic does US 4 over Bellamy River carry?

About 19,707 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 4 over Bellamy River?

The structure is 1,139 ft (347.1 m) long with a longest span of 90 ft (27.4 m) and a deck 67 ft wide.

Who owns US 4 over Bellamy River?

It is owned by the State Highway Agency.