US Bridges

Nh 12A over Blow-Me-Down Brook

Good

Sullivan County, New Hampshire · 1.6MI. from Plainfield Tl · Structure no. 005500710013900

Built
1959
66 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete
Length
38 ft
1 main span
Daily traffic
2,429
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 12A over Blow-Me-Down Brook is a concrete culvert carrying Nh 12A over Blow-Me-Down Brook in Sullivan County, New Hampshire. It was built in 1959, so it is 66 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 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 2,429 vehicles a day, roughly 7% of them trucks, projected to reach 3,594 by 2043. The structure is 38 ft (11.6 m) long. If it were closed, the detour would be 6.2 mi (10 km).

CarriesNh 12A
CrossesBlow-Me-Down Brook
Location1.6MI. from Plainfield Tl
RouteState Highway 12A
Coordinates43.4962, -72.37597
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating62.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length38 ft (11.6 m)
Longest span38 ft (11.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,429 (2023)
Projected traffic3,594 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Blow-Me-Down Brook built?

It was built in 1959, making it 66 years old in 2025.

What condition is Nh 12A over Blow-Me-Down Brook 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 April 2024.

How much traffic does Nh 12A over Blow-Me-Down Brook carry?

About 2,429 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Nh 12A over Blow-Me-Down Brook?

The structure is 38 ft (11.6 m) long with a longest span of 38 ft (11.6 m).

Who owns Nh 12A over Blow-Me-Down Brook?

It is owned by the State Highway Agency.