US Bridges

Main Street over Lamprey River

Fair

Rockingham County, New Hampshire · 0.7 Mi. RTE 125 · Structure no. 007801090005500

Built
1936
89 years old
Condition
Fair
inspected October 2024
Type
Frame
Concrete
Length
57 ft
1 main span
Daily traffic
4,039
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main Street over Lamprey River is a concrete frame carrying Main Street over Lamprey River in Rockingham County, New Hampshire. It was built in 1936, so it is 89 years old, older 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 5 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 4,039 vehicles a day, roughly 4% of them trucks, projected to reach 5,977 by 2043. The structure is 57 ft (17.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain Street
CrossesLamprey River
Location0.7 Mi. RTE 125
Coordinates43.03987, -71.07323
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating12 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length57 ft (17.4 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.9 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,039 (2023)
Projected traffic5,977 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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible 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 Main Street over Lamprey River built?

It was built in 1936, making it 89 years old in 2025.

What condition is Main Street over Lamprey 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 October 2024.

How much traffic does Main Street over Lamprey River carry?

About 4,039 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Main Street over Lamprey River?

The structure is 57 ft (17.4 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns Main Street over Lamprey River?

It is owned by the City or Municipal Highway Agency.