US Bridges

NH112 Kancamagus over Pemigewasset River

Poor

Grafton County, New Hampshire · 0.1 MI E JCT Route 3 · Structure no. 028401700015900

Built
1933
92 years old
Condition
Poor
inspected November 2024
Type
Frame
Concrete
Length
88 ft
1 main span
Daily traffic
6,210
2023 count
Owner
State
State Highway Agency

About this bridge

NH112 Kancamagus over Pemigewasset River is a concrete frame carrying NH112 Kancamagus over Pemigewasset River in Grafton County, New Hampshire. It was built in 1933, so it is 92 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,210 vehicles a day, roughly 4% of them trucks, projected to reach 9,190 by 2043. The structure is 88 ft (26.8 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNH112 Kancamagus
CrossesPemigewasset River
Location0.1 MI E JCT Route 3
RouteState Highway 112
Coordinates44.02996, -71.68491
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating36.4 US tons
Inventory rating21.8 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length88 ft (26.8 m)
Longest span80 ft (24.4 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,210 (2023)
Projected traffic9,190 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 NH112 Kancamagus over Pemigewasset River built?

It was built in 1933, making it 92 years old in 2025.

What condition is NH112 Kancamagus over Pemigewasset River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does NH112 Kancamagus over Pemigewasset River carry?

About 6,210 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH112 Kancamagus over Pemigewasset River?

The structure is 88 ft (26.8 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.

Who owns NH112 Kancamagus over Pemigewasset River?

It is owned by the State Highway Agency.