US Bridges

NH108 over Lamprey River

Fair

Rockingham County, New Hampshire · .4 MI from Jct. Rt. 152 · Structure no. 019001270009700

Built
1955
70 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
1 main span
Daily traffic
10,702
2023 count
Owner
State
State Highway Agency

About this bridge

NH108 over Lamprey River is a steel stringer/multi-beam or girder carrying NH108 over Lamprey River in Rockingham County, New Hampshire. It was built in 1955, so it is 70 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 10,702 vehicles a day, roughly 4% of them trucks, projected to reach 15,838 by 2043. The structure is 66 ft (20.1 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNH108
CrossesLamprey River
Location.4 MI from Jct. Rt. 152
RouteState Highway 108
CountyRockingham County
StateNew Hampshire
Coordinates43.08208, -70.93498
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length66 ft (20.1 m)
Longest span61 ft (18.6 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,702 (2023)
Projected traffic15,838 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 NH108 over Lamprey River built?

It was built in 1955, making it 70 years old in 2025.

What condition is NH108 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 July 2024.

How much traffic does NH108 over Lamprey River carry?

About 10,702 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH108 over Lamprey River?

The structure is 66 ft (20.1 m) long with a longest span of 61 ft (18.6 m) and a deck 35 ft wide.

Who owns NH108 over Lamprey River?

It is owned by the State Highway Agency.