US Bridges

Nh 77 over Mid Br Piscataquog River

Fair

Hillsborough County, New Hampshire · 0.2 MI S of Weare Tl · Structure no. 017901050016500

Built
1949
76 years old
Condition
Fair
inspected May 2024
Type
Frame
Concrete
Length
40 ft
1 main span
Daily traffic
2,789
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 77 over Mid Br Piscataquog River is a concrete frame carrying Nh 77 over Mid Br Piscataquog River in Hillsborough County, New Hampshire. It was built in 1949, so it is 76 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 2,789 vehicles a day, roughly 4% of them trucks, projected to reach 4,127 by 2043. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNh 77
CrossesMid Br Piscataquog River
Location0.2 MI S of Weare Tl
RouteState Highway 77
CountyHillsborough County
StateNew Hampshire
Coordinates43.01953, -71.69027
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.
Substructure7 GoodSome minor problems.
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 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 rating39.4 US tons
Inventory rating23.6 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length40 ft (12.2 m)
Longest span35 ft (10.7 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,789 (2023)
Projected traffic4,127 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 over Mid Br Piscataquog River built?

It was built in 1949, making it 76 years old in 2025.

What condition is Nh 77 over Mid Br 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 May 2024.

How much traffic does Nh 77 over Mid Br Piscataquog River carry?

About 2,789 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 77 over Mid Br Piscataquog River?

The structure is 40 ft (12.2 m) long with a longest span of 35 ft (10.7 m) and a deck 28 ft wide.

Who owns Nh 77 over Mid Br Piscataquog River?

It is owned by the State Highway Agency.