US Bridges

NH111A over Dudley Brook

Fair

Rockingham County, New Hampshire · .6 Mi. from Brentwood Tl · Structure no. 008200450008500

Built
1936
89 years old, rebuilt 1979
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
1,663
2023 count
Owner
State
State Highway Agency

About this bridge

NH111A over Dudley Brook is a concrete slab carrying NH111A over Dudley Brook in Rockingham County, New Hampshire. It was built in 1936 and reconstructed in 1979, so it is 89 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 5 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 1,663 vehicles a day, roughly 4% of them trucks, projected to reach 2,461 by 2043. The structure is 26 ft (7.9 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNH111A
CrossesDudley Brook
Location.6 Mi. from Brentwood Tl
RouteState Highway 111A
CountyRockingham County
StateNew Hampshire
Coordinates42.98873, -71.00036
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating28.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,663 (2023)
Projected traffic2,461 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 NH111A over Dudley Brook built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1979.

What condition is NH111A over Dudley 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 May 2024.

How much traffic does NH111A over Dudley Brook carry?

About 1,663 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH111A over Dudley Brook?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 36 ft wide.

Who owns NH111A over Dudley Brook?

It is owned by the State Highway Agency.