US Bridges

NH112 Lost Riv RD over Clay Brook

Fair

Grafton County, New Hampshire · 3.5 MI from Landaff Tl · Structure no. 007201140003500

Built
1932
93 years old, rebuilt 1983
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
1,677
2023 count
Owner
State
State Highway Agency

About this bridge

NH112 Lost Riv RD over Clay Brook is a concrete slab carrying NH112 Lost Riv RD over Clay Brook in Grafton County, New Hampshire. It was built in 1932 and reconstructed in 1983, so it is 93 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 1,677 vehicles a day, roughly 5% of them trucks, projected to reach 2,481 by 2043. The structure is 23 ft (7 m) long and 33 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

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CarriesNH112 Lost Riv RD
CrossesClay Brook
Location3.5 MI from Landaff Tl
RouteState Highway 112
CountyGrafton County
StateNew Hampshire
Coordinates44.07701, -71.79619
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.3 US tons
Inventory rating27.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,677 (2023)
Projected traffic2,481 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 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 Lost Riv RD over Clay Brook built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1983.

What condition is NH112 Lost Riv RD over Clay 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 June 2023.

How much traffic does NH112 Lost Riv RD over Clay Brook carry?

About 1,677 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH112 Lost Riv RD over Clay Brook?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 33 ft wide.

Who owns NH112 Lost Riv RD over Clay Brook?

It is owned by the State Highway Agency.