US Bridges

NH108 over Powwow River

Good

Rockingham County, New Hampshire · 0.1 MI from JCT RTE 107A · Structure no. 007100670005700

Built
1926
99 years old, rebuilt 2006
Condition
Good
inspected June 2024
Type
Tee Beam
Concrete
Length
26 ft
1 main span
Daily traffic
1,716
2023 count
Owner
State
State Highway Agency

About this bridge

NH108 over Powwow River is a concrete tee beam carrying NH108 over Powwow River in Rockingham County, New Hampshire. It was built in 1926 and reconstructed in 2006, so it is 99 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 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 1,716 vehicles a day, roughly 4% of them trucks, projected to reach 2,539 by 2043. The structure is 26 ft (7.8 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNH108
CrossesPowwow River
Location0.1 MI from JCT RTE 107A
RouteState Highway 108
Coordinates42.90793, -71.01603
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length26 ft (7.8 m)
Longest span24 ft (7.3 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,716 (2023)
Projected traffic2,539 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Powwow River built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 2006.

What condition is NH108 over Powwow 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 June 2024.

How much traffic does NH108 over Powwow River carry?

About 1,716 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH108 over Powwow River?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.3 m) and a deck 34 ft wide.

Who owns NH108 over Powwow River?

It is owned by the State Highway Agency.