US Bridges

NH113 over Forrest Brook

Fair

Carroll County, New Hampshire · 1.9 MI NE Tamworth Tl · Structure no. 016000810009000

Built
1955
70 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
2,779
2023 count
Owner
State
State Highway Agency

About this bridge

NH113 over Forrest Brook is a concrete slab carrying NH113 over Forrest Brook in Carroll County, New Hampshire. It was built in 1955, so it is 70 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 2,779 vehicles a day, roughly 4% of them trucks, projected to reach 4,112 by 2043. The structure is 26 ft (7.9 m) long and 37 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNH113
CrossesForrest Brook
Location1.9 MI NE Tamworth Tl
RouteState Highway 113
CountyCarroll County
StateNew Hampshire
Coordinates43.88759, -71.16947
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 inspectionApril 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.6 US tons
Inventory rating30.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width37 ft (11.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,779 (2023)
Projected traffic4,112 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 NH113 over Forrest Brook built?

It was built in 1955, making it 70 years old in 2025.

What condition is NH113 over Forrest Brook 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 April 2024.

How much traffic does NH113 over Forrest Brook carry?

About 2,779 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH113 over Forrest Brook?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 37 ft wide.

Who owns NH113 over Forrest Brook?

It is owned by the State Highway Agency.