US Bridges

Nh 12A over Blood Brook

Fair

Grafton County, New Hampshire · .4 Mi. from Plainfield Tl · Structure no. 014400490006400

Built
1954
71 years old
Condition
Fair
inspected June 2023
Type
Frame
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
3,586
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12A over Blood Brook is a concrete continuous frame carrying Nh 12A over Blood Brook in Grafton County, New Hampshire. It was built in 1954, so it is 71 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 3,586 vehicles a day, roughly 7% of them trucks, projected to reach 5,307 by 2043. The structure is 103 ft (31.4 m) long and 35 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesNh 12A
CrossesBlood Brook
Location.4 Mi. from Plainfield Tl
RouteState Highway 12A
CountyGrafton County
StateNew Hampshire
Coordinates43.60635, -72.32523
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating79.6 US tons
Inventory rating47.7 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length103 ft (31.4 m)
Longest span40 ft (12.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,586 (2023)
Projected traffic5,307 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 Nh 12A over Blood Brook built?

It was built in 1954, making it 71 years old in 2025.

What condition is Nh 12A over Blood 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 2023.

How much traffic does Nh 12A over Blood Brook carry?

About 3,586 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12A over Blood Brook?

The structure is 103 ft (31.4 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.

Who owns Nh 12A over Blood Brook?

It is owned by the State Highway Agency.