US Bridges

Boston Post Road over Beaver Brook

Fair

Hillsborough County, New Hampshire · .06 MI FR Nh RTE 122 · Structure no. 000701600010500

Built
1984
41 years old
Condition
Fair
inspected June 2023
Type
Frame
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
3,564
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boston Post Road over Beaver Brook is a concrete continuous frame carrying Boston Post Road over Beaver Brook in Hillsborough County, New Hampshire. It was built in 1984, so it is 41 years old, younger 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 3,564 vehicles a day, roughly 4% of them trucks, projected to reach 5,274 by 2043. The structure is 36 ft (11 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBoston Post Road
CrossesBeaver Brook
Location.06 MI FR Nh RTE 122
CountyHillsborough County
StateNew Hampshire
Coordinates42.84922, -71.61547
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.9 US tons
Inventory rating40 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length36 ft (11 m)
Longest span15 ft (4.6 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,564 (2023)
Projected traffic5,274 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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 Boston Post Road over Beaver Brook built?

It was built in 1984, making it 41 years old in 2025.

What condition is Boston Post Road 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 Boston Post Road over Beaver Brook carry?

About 3,564 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Boston Post Road over Beaver Brook?

The structure is 36 ft (11 m) long with a longest span of 15 ft (4.6 m) and a deck 44 ft wide.

Who owns Boston Post Road over Beaver Brook?

It is owned by the City or Municipal Highway Agency.