US Bridges

Searles Road over Salmon Brook

Good

Hillsborough County, New Hampshire · .2 MI W of E Dunstable RD · Structure no. 017701110004500

Built
1999
26 years old
Condition
Good
inspected August 2023
Type
Frame
Concrete
Length
39 ft
1 main span
Daily traffic
2,270
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Searles Road over Salmon Brook is a concrete frame carrying Searles Road over Salmon Brook in Hillsborough 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 2,270 vehicles a day, roughly 5% of them trucks, projected to reach 3,359 by 2043. The structure is 39 ft (11.9 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSearles Road
CrossesSalmon Brook
Location.2 MI W of E Dunstable RD
RouteCity Street 0
CountyHillsborough County
StateNew Hampshire
Coordinates42.71376, -71.48247
Functional classUrban Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78 US tons
Inventory rating46.8 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length39 ft (11.9 m)
Longest span36 ft (11 m)
Deck width44 ft (13.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,270 (2023)
Projected traffic3,359 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Searles Road over Salmon Brook built?

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

What condition is Searles Road over Salmon 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 August 2023.

How much traffic does Searles Road over Salmon Brook carry?

About 2,270 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Searles Road over Salmon Brook?

The structure is 39 ft (11.9 m) long with a longest span of 36 ft (11 m) and a deck 44 ft wide.

Who owns Searles Road over Salmon Brook?

It is owned by the City or Municipal Highway Agency.