US Bridges

NH111 over Nashua River

Fair

Hillsborough County, New Hampshire · .7 MI from Nashua Tl · Structure no. 012701440004200

Built
1950
75 years old, rebuilt 1982
Condition
Fair
inspected May 2024
Type
Arch - Deck
Concrete Continuous
Length
252 ft
2 main spans
Daily traffic
12,103
2023 count
Owner
State
State Highway Agency

About this bridge

NH111 over Nashua River is a concrete continuous arch - deck carrying NH111 over Nashua River in Hillsborough County, New Hampshire. It was built in 1950 and reconstructed in 1982, so it is 75 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 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 12,103 vehicles a day, roughly 4% of them trucks, projected to reach 17,912 by 2043. The structure is 252 ft (76.8 m) long and 46 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNH111
CrossesNashua River
Location.7 MI from Nashua Tl
RouteState Highway 111
CountyHillsborough County
StateNew Hampshire
Coordinates42.71284, -71.54867
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.8 US tons
Inventory rating29.2 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length252 ft (76.8 m)
Longest span78 ft (23.8 m)
Deck width46 ft (14 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,103 (2023)
Projected traffic17,912 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 NH111 over Nashua River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1982.

What condition is NH111 over Nashua 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 May 2024.

How much traffic does NH111 over Nashua River carry?

About 12,103 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH111 over Nashua River?

The structure is 252 ft (76.8 m) long with a longest span of 78 ft (23.8 m) and a deck 46 ft wide.

Who owns NH111 over Nashua River?

It is owned by the State Highway Agency.