US Bridges

Nh 12A over Nhrr

Poor

Grafton County, New Hampshire · 100 Ft from JCT RTE 10 · Structure no. 014400620011700

Built
1949
76 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
145 ft
3 main spans
Daily traffic
9,117
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Nh 12A over Nhrr is a steel continuous stringer/multi-beam or girder carrying Nh 12A over Nhrr in Grafton County, New Hampshire. It was built in 1949, so it is 76 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 9,117 vehicles a day, roughly 5% of them trucks, projected to reach 13,493 by 2043. The structure is 145 ft (44.2 m) long and 28 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesNh 12A
CrossesNhrr
Location100 Ft from JCT RTE 10
RouteState Highway 12A
CountyGrafton County
StateNew Hampshire
Coordinates43.644, -72.31019
Functional classUrban Minor 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 16 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.2 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length145 ft (44.2 m)
Longest span55 ft (16.8 m)
Deck width28 ft (8.4 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,117 (2023)
Projected traffic13,493 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 12A over Nhrr built?

It was built in 1949, making it 76 years old in 2025.

What condition is Nh 12A over Nhrr 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 October 2024.

How much traffic does Nh 12A over Nhrr carry?

About 9,117 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 12A over Nhrr?

The structure is 145 ft (44.2 m) long with a longest span of 55 ft (16.8 m) and a deck 28 ft wide.

Who owns Nh 12A over Nhrr?

It is owned by the City or Municipal Highway Agency.