US Bridges

Boston Post Road over Beaver Brook

Fair

Hillsborough County, New Hampshire · 1.6 MI Mont Vernon Tl · Structure no. 000701240008700

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Culvert
Steel
Length
20 ft
2 main spans
Daily traffic
2,515
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Boston Post Road over Beaver Brook is a steel culvert carrying Boston Post Road over Beaver Brook in Hillsborough County, New Hampshire. It was built in 1970, so it is 55 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 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 2,515 vehicles a day, roughly 4% of them trucks, projected to reach 3,722 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesBoston Post Road
CrossesBeaver Brook
Location1.6 MI Mont Vernon Tl
CountyHillsborough County
StateNew Hampshire
Coordinates42.87047, -71.63617
Functional classRural Local

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating49.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,515 (2023)
Projected traffic3,722 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Boston Post Road over Beaver Brook built?

It was built in 1970, making it 55 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 2,515 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Boston Post Road over Beaver Brook?

The structure is 20 ft (6.1 m) long with a longest span of 8 ft (2.4 m).

Who owns Boston Post Road over Beaver Brook?

It is owned by the City or Municipal Highway Agency.