US Bridges

Nh 77 Truck Route over Piscataquog River

Fair

Hillsborough County, New Hampshire · 0.02 MI S JCT Nh 77 · Structure no. 026700970015400

Built
1940
85 years old
Condition
Fair
inspected June 2023
Type
Frame
Concrete
Length
69 ft
1 main span
Daily traffic
3,359
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 77 Truck Route over Piscataquog River is a concrete frame carrying Nh 77 Truck Route over Piscataquog River in Hillsborough County, New Hampshire. It was built in 1940, so it is 85 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 3,359 vehicles a day, roughly 4% of them trucks, projected to reach 4,971 by 2043. The structure is 69 ft (21 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNh 77 Truck Route
CrossesPiscataquog River
Location0.02 MI S JCT Nh 77
RouteState Highway 0
CountyHillsborough County
StateNew Hampshire
Coordinates43.11385, -71.73737
Functional classRural Major 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
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating36.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length69 ft (21 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,359 (2023)
Projected traffic4,971 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 Truck Route over Piscataquog River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Nh 77 Truck Route 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 Truck Route over Piscataquog River carry?

About 3,359 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 77 Truck Route over Piscataquog River?

The structure is 69 ft (21 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Nh 77 Truck Route over Piscataquog River?

It is owned by the State Highway Agency.