US Bridges

NH101 over Boston Post RD Beaver Bk

Fair

Hillsborough County, New Hampshire · 1.56 MI Milford Tl · Structure no. 000701590010700

Built
1969
56 years old, rebuilt 2011
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
136 ft
2 main spans
Daily traffic
11,884
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Boston Post RD Beaver Bk is a steel continuous stringer/multi-beam or girder carrying NH101 over Boston Post RD Beaver Bk in Hillsborough County, New Hampshire. It was built in 1969 and reconstructed in 2011, so it is 56 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 11,884 vehicles a day, roughly 7% of them trucks, projected to reach 17,588 by 2043. The structure is 136 ft (41.5 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNH101
CrossesBoston Post RD Beaver Bk
Location1.56 MI Milford Tl
RouteState Highway 101
CountyHillsborough County
StateNew Hampshire
Coordinates42.84808, -71.6136
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.3 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span66 ft (20.1 m)
Deck width47 ft (14.3 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,884 (2023)
Projected traffic17,588 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NH101 over Boston Post RD Beaver Bk built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2011.

What condition is NH101 over Boston Post RD Beaver Bk 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 NH101 over Boston Post RD Beaver Bk carry?

About 11,884 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH101 over Boston Post RD Beaver Bk?

The structure is 136 ft (41.5 m) long with a longest span of 66 ft (20.1 m) and a deck 47 ft wide.

Who owns NH101 over Boston Post RD Beaver Bk?

It is owned by the State Highway Agency.