US Bridges

Blake Hill Road over Blake Brook

Good

Belknap County, New Hampshire · 0.8 MI FR Old Bristol RD · Structure no. 018400660006100

Built
1999
26 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
111
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Blake Hill Road over Blake Brook is a concrete culvert carrying Blake Hill Road over Blake Brook in Belknap County, New Hampshire. It was built in 1999, so it is 26 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 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 111 vehicles a day, roughly 4% of them trucks, projected to reach 164 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesBlake Hill Road
CrossesBlake Brook
Location0.8 MI FR Old Bristol RD
CountyBelknap County
StateNew Hampshire
Coordinates43.57946, -71.69529
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating99 US tons
Inventory rating79.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic111 (2023)
Projected traffic164 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Blake Hill Road over Blake Brook built?

It was built in 1999, making it 26 years old in 2025.

What condition is Blake Hill Road over Blake 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 October 2023.

How much traffic does Blake Hill Road over Blake Brook carry?

About 111 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Blake Hill Road over Blake Brook?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m).

Who owns Blake Hill Road over Blake Brook?

It is owned by the City or Municipal Highway Agency.