US Bridges

Nh 12 over Nhrr(abd)

Poor

Cheshire County, New Hampshire · 0.3MI to Troy Center · Structure no. 025800960009100

Built
1957
68 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
71 ft
2 main spans
Daily traffic
8,066
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12 over Nhrr(abd) is a steel stringer/multi-beam or girder carrying Nh 12 over Nhrr(abd) in Cheshire County, New Hampshire. It was built in 1957, 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 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 8,066 vehicles a day, roughly 7% of them trucks, projected to reach 11,937 by 2043. The structure is 71 ft (21.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNh 12
CrossesNhrr(abd)
Location0.3MI to Troy Center
RouteState Highway 12
CountyCheshire County
StateNew Hampshire
Coordinates42.82777, -72.18386
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.7 US tons
Inventory rating16.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span39 ft (11.9 m)
Deck width41 ft (12.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,066 (2023)
Projected traffic11,937 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nh 12 over Nhrr(abd) built?

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

What condition is Nh 12 over Nhrr(abd) 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 Nh 12 over Nhrr(abd) carry?

About 8,066 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12 over Nhrr(abd)?

The structure is 71 ft (21.6 m) long with a longest span of 39 ft (11.9 m) and a deck 41 ft wide.

Who owns Nh 12 over Nhrr(abd)?

It is owned by the State Highway Agency.