US Bridges

NH101 over Howe Reservoir

Good

Cheshire County, New Hampshire · 1.9MI E Marlboro T.L. · Structure no. 006600740011700

Built
1980
45 years old
Condition
Good
inspected May 2024
Type
Frame
Concrete
Length
23 ft
1 main span
Daily traffic
6,178
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Howe Reservoir is a concrete frame carrying NH101 over Howe Reservoir in Cheshire County, New Hampshire. It was built in 1980, so it is 45 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,178 vehicles a day, roughly 7% of them trucks, projected to reach 9,143 by 2043. The structure is 23 ft (7 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesNH101
CrossesHowe Reservoir
Location1.9MI E Marlboro T.L.
RouteState Highway 101
Coordinates42.91236, -72.11976
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
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 evaluation7: Better than 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 rating110.1 US tons
Inventory rating66.6 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width47 ft (14.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,178 (2023)
Projected traffic9,143 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 NH101 over Howe Reservoir built?

It was built in 1980, making it 45 years old in 2025.

What condition is NH101 over Howe Reservoir in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does NH101 over Howe Reservoir carry?

About 6,178 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH101 over Howe Reservoir?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 47 ft wide.

Who owns NH101 over Howe Reservoir?

It is owned by the State Highway Agency.