US Bridges

NH113 over Mill Brook

Good

Carroll County, New Hampshire · 0.5 MI from Nh 25 · Structure no. 025201390010900

Built
1987
38 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
2,249
2023 count
Owner
State
State Highway Agency

About this bridge

NH113 over Mill Brook is a steel stringer/multi-beam or girder carrying NH113 over Mill Brook in Carroll County, New Hampshire. It was built in 1987, so it is 38 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,249 vehicles a day, roughly 4% of them trucks, projected to reach 3,328 by 2043. The structure is 53 ft (16.2 m) long and 39 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesNH113
CrossesMill Brook
Location0.5 MI from Nh 25
RouteState Highway 113
CountyCarroll County
StateNew Hampshire
Coordinates43.84006, -71.26462
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating46.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length53 ft (16.2 m)
Longest span48 ft (14.6 m)
Deck width39 ft (11.8 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,249 (2023)
Projected traffic3,328 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 Mill Brook built?

It was built in 1987, making it 38 years old in 2025.

What condition is NH113 over Mill Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does NH113 over Mill Brook carry?

About 2,249 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH113 over Mill Brook?

The structure is 53 ft (16.2 m) long with a longest span of 48 ft (14.6 m) and a deck 39 ft wide.

Who owns NH113 over Mill Brook?

It is owned by the State Highway Agency.