US Bridges

Sargent Road over Williams Brook

Good

Merrimack County, New Hampshire · 190 Ft FR Zion Hill RD · Structure no. 019600870013300

Built
1985
40 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
2,425
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sargent Road over Williams Brook is a prestressed concrete box beam or girders - multiple carrying Sargent Road over Williams Brook in Merrimack County, New Hampshire. It was built in 1985, so it is 40 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 2,425 vehicles a day, roughly 4% of them trucks, projected to reach 3,589 by 2043. The structure is 45 ft (13.7 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSargent Road
CrossesWilliams Brook
Location190 Ft FR Zion Hill RD
CountyMerrimack County
StateNew Hampshire
Coordinates43.433, -71.6012
Functional classUrban Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length45 ft (13.7 m)
Longest span42 ft (12.8 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,425 (2023)
Projected traffic3,589 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Sargent Road over Williams Brook built?

It was built in 1985, making it 40 years old in 2025.

What condition is Sargent Road over Williams 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 Sargent Road over Williams Brook carry?

About 2,425 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Sargent Road over Williams Brook?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.8 m) and a deck 32 ft wide.

Who owns Sargent Road over Williams Brook?

It is owned by the City or Municipal Highway Agency.