US Bridges

NH112 over Downes Brook

Fair

Carroll County, New Hampshire · 0.1 MI from Waterville · Structure no. 000200300015000

Built
1963
62 years old, rebuilt 1993
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
2,710
2023 count
Owner
State
State Highway Agency

About this bridge

NH112 over Downes Brook is a prestressed concrete slab carrying NH112 over Downes Brook in Carroll County, New Hampshire. It was built in 1963 and reconstructed in 1993, so it is 62 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 2,710 vehicles a day, roughly 4% of them trucks, projected to reach 4,010 by 2043. The structure is 28 ft (8.5 m) long and 36 ft wide. If it were closed, the detour would be 52.2 mi (84 km).

Location

Open in Google Maps
CarriesNH112
CrossesDownes Brook
Location0.1 MI from Waterville
RouteState Highway 112
CountyCarroll County
StateNew Hampshire
Coordinates43.99539, -71.37485
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating87.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,710 (2023)
Projected traffic4,010 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 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 over Downes Brook built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1993.

What condition is NH112 over Downes 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 August 2024.

How much traffic does NH112 over Downes Brook carry?

About 2,710 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH112 over Downes Brook?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 36 ft wide.

Who owns NH112 over Downes Brook?

It is owned by the State Highway Agency.