US Bridges

NH101 over Otter Brook

Poor

Cheshire County, New Hampshire · 1.5 MI from Marlboro Tl · Structure no. 013601660005000

Built
1933
92 years old
Condition
Poor
inspected November 2024
Type
Frame
Concrete
Length
82 ft
1 main span
Daily traffic
11,538
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Otter Brook is a concrete frame carrying NH101 over Otter Brook in Cheshire County, New Hampshire. It was built in 1933, so it is 92 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 11,538 vehicles a day, roughly 5% of them trucks, projected to reach 17,076 by 2043. The structure is 82 ft (25 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNH101
CrossesOtter Brook
Location1.5 MI from Marlboro Tl
RouteState Highway 101
CountyCheshire County
StateNew Hampshire
Coordinates42.91551, -72.24822
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 8 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.2 US tons
Inventory rating30.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length82 ft (25 m)
Longest span70 ft (21.3 m)
Deck width34 ft (10.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,538 (2023)
Projected traffic17,076 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Otter Brook built?

It was built in 1933, making it 92 years old in 2025.

What condition is NH101 over Otter Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does NH101 over Otter Brook carry?

About 11,538 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH101 over Otter Brook?

The structure is 82 ft (25 m) long with a longest span of 70 ft (21.3 m) and a deck 34 ft wide.

Who owns NH101 over Otter Brook?

It is owned by the State Highway Agency.