US Bridges

NH112 Lost Riv RD over Lost River

Fair

Grafton County, New Hampshire · 1.9 MI W of JCT Rt 118 · Structure no. 028401030013500

Built
1957
68 years old, rebuilt 1998
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
1,677
2023 count
Owner
State
State Highway Agency

About this bridge

NH112 Lost Riv RD over Lost River is a steel stringer/multi-beam or girder carrying NH112 Lost Riv RD over Lost River in Grafton County, New Hampshire. It was built in 1957 and reconstructed in 1998, so it is 68 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 4% of them trucks, projected to reach 2,481 by 2043. The structure is 65 ft (19.8 m) long and 34 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesNH112 Lost Riv RD
CrossesLost River
Location1.9 MI W of JCT Rt 118
RouteState Highway 112
CountyGrafton County
StateNew Hampshire
Coordinates44.02621, -71.75444
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length65 ft (19.8 m)
Longest span60 ft (18.3 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,677 (2023)
Projected traffic2,481 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Lost River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1998.

What condition is NH112 Lost Riv RD over Lost River 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 May 2024.

How much traffic does NH112 Lost Riv RD over Lost River carry?

About 1,677 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH112 Lost Riv RD over Lost River?

The structure is 65 ft (19.8 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.

Who owns NH112 Lost Riv RD over Lost River?

It is owned by the State Highway Agency.