US Bridges

Nh 77 NH114 over Piscataquog River

Fair

Hillsborough County, New Hampshire · 1.9 MI S of Henniker Tl · Structure no. 026700840015100

Built
1939
86 years old, rebuilt 1990
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
7,831
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 77 NH114 over Piscataquog River is a steel stringer/multi-beam or girder carrying Nh 77 NH114 over Piscataquog River in Hillsborough County, New Hampshire. It was built in 1939 and reconstructed in 1990, so it is 86 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 7,831 vehicles a day, roughly 7% of them trucks, projected to reach 11,589 by 2043. The structure is 65 ft (19.8 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNh 77 NH114
CrossesPiscataquog River
Location1.9 MI S of Henniker Tl
RouteState Highway 114
CountyHillsborough County
StateNew Hampshire
Coordinates43.10958, -71.75043
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.4 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length65 ft (19.8 m)
Longest span59 ft (18 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,831 (2023)
Projected traffic11,589 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Nh 77 NH114 over Piscataquog River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1990.

What condition is Nh 77 NH114 over Piscataquog 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 2023.

How much traffic does Nh 77 NH114 over Piscataquog River carry?

About 7,831 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 77 NH114 over Piscataquog River?

The structure is 65 ft (19.8 m) long with a longest span of 59 ft (18 m) and a deck 36 ft wide.

Who owns Nh 77 NH114 over Piscataquog River?

It is owned by the State Highway Agency.