US Bridges

NH103 over Andrew Brook

Fair

Merrimack County, New Hampshire · 3.8 MI from Bradford Tl · Structure no. 018001040009200

Built
1937
88 years old, rebuilt 1982
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
4,837
2023 count
Owner
State
State Highway Agency

About this bridge

NH103 over Andrew Brook is a concrete slab carrying NH103 over Andrew Brook in Merrimack County, New Hampshire. It was built in 1937 and reconstructed in 1982, so it is 88 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 4,837 vehicles a day, roughly 4% of them trucks, projected to reach 7,158 by 2043. The structure is 29 ft (8.8 m) long and 49 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNH103
CrossesAndrew Brook
Location3.8 MI from Bradford Tl
RouteState Highway 103
CountyMerrimack County
StateNew Hampshire
Coordinates43.31164, -72.02429
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length29 ft (8.8 m)
Longest span25 ft (7.6 m)
Deck width49 ft (14.8 m)
Roadway width46 ft (13.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,837 (2023)
Projected traffic7,158 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 NH103 over Andrew Brook built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1982.

What condition is NH103 over Andrew 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 April 2024.

How much traffic does NH103 over Andrew Brook carry?

About 4,837 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH103 over Andrew Brook?

The structure is 29 ft (8.8 m) long with a longest span of 25 ft (7.6 m) and a deck 49 ft wide.

Who owns NH103 over Andrew Brook?

It is owned by the State Highway Agency.