US Bridges

NH116 NH142 over Bog Brook

Fair

Coos County, New Hampshire · 0.1 MI from JCT Route 3 · Structure no. 027401030009500

Built
1956
69 years old
Condition
Fair
inspected June 2024
Type
Frame
Concrete Continuous
Length
181 ft
3 main spans
Daily traffic
4,726
2023 count
Owner
State
State Highway Agency

About this bridge

NH116 NH142 over Bog Brook is a concrete continuous frame carrying NH116 NH142 over Bog Brook in Coos County, New Hampshire. It was built in 1956, so it is 69 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 4,726 vehicles a day, roughly 4% of them trucks, projected to reach 6,994 by 2043. The structure is 181 ft (55.2 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH116 NH142
CrossesBog Brook
Location0.1 MI from JCT Route 3
RouteState Highway 116
CountyCoos County
StateNew Hampshire
Coordinates44.36596, -71.6193
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 protection7 GoodSome minor problems.
Last inspectionJune 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating32 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length181 ft (55.2 m)
Longest span64 ft (19.5 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,726 (2023)
Projected traffic6,994 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 NH142 over Bog Brook built?

It was built in 1956, making it 69 years old in 2025.

What condition is NH116 NH142 over Bog 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 2024.

How much traffic does NH116 NH142 over Bog Brook carry?

About 4,726 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH116 NH142 over Bog Brook?

The structure is 181 ft (55.2 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.

Who owns NH116 NH142 over Bog Brook?

It is owned by the State Highway Agency.