US Bridges

Jamestown Road over Winnipesaukee River

Fair

Belknap County, New Hampshire · At Belmont Town Line · Structure no. 025601340009400

Built
1982
43 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
184 ft
3 main spans
Daily traffic
3,412
2023 count
Owner
State
State Highway Agency

About this bridge

Jamestown Road over Winnipesaukee River is a steel continuous stringer/multi-beam or girder carrying Jamestown Road over Winnipesaukee River in Belknap County, New Hampshire. It was built in 1982, so it is 43 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,412 vehicles a day, roughly 4% of them trucks, projected to reach 5,049 by 2043. The structure is 184 ft (56.1 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesJamestown Road
CrossesWinnipesaukee River
LocationAt Belmont Town Line
RouteState Highway 0
CountyBelknap County
StateNew Hampshire
Coordinates43.47178, -71.53274
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating46.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length184 ft (56.1 m)
Longest span70 ft (21.3 m)
Deck width37 ft (11.4 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,412 (2023)
Projected traffic5,049 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
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 Jamestown Road over Winnipesaukee River built?

It was built in 1982, making it 43 years old in 2025.

What condition is Jamestown Road over Winnipesaukee River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does Jamestown Road over Winnipesaukee River carry?

About 3,412 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Jamestown Road over Winnipesaukee River?

The structure is 184 ft (56.1 m) long with a longest span of 70 ft (21.3 m) and a deck 37 ft wide.

Who owns Jamestown Road over Winnipesaukee River?

It is owned by the State Highway Agency.