US Bridges

NH116 over Clark Brook

Fair

Grafton County, New Hampshire · .06 MI JCT 10 · Structure no. 011701390013300

Built
1961
64 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
3,712
2023 count
Owner
State
State Highway Agency

About this bridge

NH116 over Clark Brook is a steel stringer/multi-beam or girder carrying NH116 over Clark Brook in Grafton County, New Hampshire. It was built in 1961, so it is 64 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 5 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 3,712 vehicles a day, roughly 10% of them trucks, projected to reach 5,493 by 2043. The structure is 45 ft (13.7 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNH116
CrossesClark Brook
Location.06 MI JCT 10
RouteState Highway 116
CountyGrafton County
StateNew Hampshire
Coordinates44.08941, -72.02494
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating29.5 US tons
Inventory rating17.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span42 ft (12.8 m)
Deck width38 ft (11.6 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,712 (2023)
Projected traffic5,493 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 NH116 over Clark Brook built?

It was built in 1961, making it 64 years old in 2025.

What condition is NH116 over Clark 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 March 2024.

How much traffic does NH116 over Clark Brook carry?

About 3,712 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NH116 over Clark Brook?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.8 m) and a deck 38 ft wide.

Who owns NH116 over Clark Brook?

It is owned by the State Highway Agency.