US Bridges

NH122 Amherst ST over Beaver Brook

Fair

Hillsborough County, New Hampshire · 2.15 MI NE Milford Tl · Structure no. 000701370010400

Built
1940
85 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
23 ft
1 main span
Daily traffic
6,868
2023 count
Owner
State
State Highway Agency

About this bridge

NH122 Amherst ST over Beaver Brook is a concrete culvert carrying NH122 Amherst ST over Beaver Brook in Hillsborough County, New Hampshire. It was built in 1940, so it is 85 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 6,868 vehicles a day, roughly 4% of them trucks, projected to reach 10,164 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNH122 Amherst ST
CrossesBeaver Brook
Location2.15 MI NE Milford Tl
RouteState Highway 0
CountyHillsborough County
StateNew Hampshire
Coordinates42.86201, -71.61944
Functional classUrban 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,868 (2023)
Projected traffic10,164 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 NH122 Amherst ST over Beaver Brook built?

It was built in 1940, making it 85 years old in 2025.

What condition is NH122 Amherst ST over Beaver 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 NH122 Amherst ST over Beaver Brook carry?

About 6,868 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH122 Amherst ST over Beaver Brook?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m).

Who owns NH122 Amherst ST over Beaver Brook?

It is owned by the State Highway Agency.