US Bridges

Robinson Road over Moose Brook

Fair

Hillsborough County, New Hampshire · 3.2 MI from Greenfield T · Structure no. 011201500009100

Built
1990
35 years old
Condition
Fair
inspected August 2024
Type
Slab
Wood or Timber
Length
28 ft
1 main span
Daily traffic
21
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Robinson Road over Moose Brook is a wood or timber slab carrying Robinson Road over Moose Brook in Hillsborough County, New Hampshire. It was built in 1990, so it is 35 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 21 vehicles a day, projected to reach 31 by 2043. The structure is 28 ft (8.5 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesRobinson Road
CrossesMoose Brook
Location3.2 MI from Greenfield T
CountyHillsborough County
StateNew Hampshire
Coordinates42.97303, -71.94373
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to 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 rating72 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length28 ft (8.5 m)
Longest span25 ft (7.6 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2023)
Projected traffic31 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Robinson Road over Moose Brook built?

It was built in 1990, making it 35 years old in 2025.

What condition is Robinson Road over Moose 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 August 2024.

How much traffic does Robinson Road over Moose Brook carry?

About 21 vehicles per day (2023 count).

How long is Robinson Road over Moose Brook?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.6 m) and a deck 16 ft wide.

Who owns Robinson Road over Moose Brook?

It is owned by the City or Municipal Highway Agency.