US Bridges

NH101 over Blood Brook

Good

Hillsborough County, New Hampshire · 1.6 MI from Wilton Tl · Structure no. 025300940011400

Built
1930
95 years old
Condition
Good
inspected April 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
7,670
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Blood Brook is a concrete slab carrying NH101 over Blood Brook in Hillsborough County, New Hampshire. It was built in 1930, so it is 95 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,670 vehicles a day, roughly 7% of them trucks, projected to reach 11,351 by 2043. The structure is 24 ft (7.3 m) long and 49 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesNH101
CrossesBlood Brook
Location1.6 MI from Wilton Tl
RouteState Highway 101
Coordinates42.84244, -71.85293
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.4 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width49 ft (14.9 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,670 (2023)
Projected traffic11,351 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was NH101 over Blood Brook built?

It was built in 1930, making it 95 years old in 2025.

What condition is NH101 over Blood Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does NH101 over Blood Brook carry?

About 7,670 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH101 over Blood Brook?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m) and a deck 49 ft wide.

Who owns NH101 over Blood Brook?

It is owned by the State Highway Agency.