US Bridges

Coolidge Woods RD over Blake Brook

Good

Belknap County, New Hampshire · 85 Feet FR Brook Road · Structure no. 018400550007400

Built
1940
85 years old, rebuilt 2016
Condition
Good
inspected October 2023
Type
Tee Beam
Concrete
Length
28 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coolidge Woods RD over Blake Brook is a concrete tee beam carrying Coolidge Woods RD over Blake Brook in Belknap County, New Hampshire. It was built in 1940 and reconstructed in 2016, so it is 85 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 96 vehicles a day, projected to reach 142 by 2043. The structure is 28 ft (8.4 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCoolidge Woods RD
CrossesBlake Brook
Location85 Feet FR Brook Road
CountyBelknap County
StateNew Hampshire
Coordinates43.5792, -71.71447
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 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
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.3 US tons
Inventory rating42.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length28 ft (8.4 m)
Longest span27 ft (8.1 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
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 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 Coolidge Woods RD over Blake Brook built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2016.

What condition is Coolidge Woods RD 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 Coolidge Woods RD over Blake Brook carry?

About 96 vehicles per day (2023 count).

How long is Coolidge Woods RD over Blake Brook?

The structure is 28 ft (8.4 m) long with a longest span of 27 ft (8.1 m) and a deck 20 ft wide.

Who owns Coolidge Woods RD over Blake Brook?

It is owned by the City or Municipal Highway Agency.