US Bridges

Nh 10 over Ash Swamp Brook

Good

Sullivan County, New Hampshire · 4.3 Mi. N. of Newport Tl · Structure no. 005601400012000

Built
1927
98 years old, rebuilt 2006
Condition
Good
inspected May 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
3,532
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 10 over Ash Swamp Brook is a concrete slab carrying Nh 10 over Ash Swamp Brook in Sullivan County, New Hampshire. It was built in 1927 and reconstructed in 2006, so it is 98 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 3,532 vehicles a day, roughly 4% of them trucks, projected to reach 5,227 by 2043. The structure is 24 ft (7.3 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesNh 10
CrossesAsh Swamp Brook
Location4.3 Mi. N. of Newport Tl
RouteState Highway 10
Coordinates43.45241, -72.16093
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating99 US tons
Inventory rating94.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span21 ft (6.4 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,532 (2023)
Projected traffic5,227 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 10 over Ash Swamp Brook built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 2006.

What condition is Nh 10 over Ash Swamp 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 May 2024.

How much traffic does Nh 10 over Ash Swamp Brook carry?

About 3,532 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 10 over Ash Swamp Brook?

The structure is 24 ft (7.3 m) long with a longest span of 21 ft (6.4 m) and a deck 31 ft wide.

Who owns Nh 10 over Ash Swamp Brook?

It is owned by the State Highway Agency.