US Bridges

Forest Road over Williams Brook

Good

Merrimack County, New Hampshire · 0.10 MI FR Sargent ST · Structure no. 019600940013100

Built
1960
65 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
582
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Forest Road over Williams Brook is a concrete culvert carrying Forest Road over Williams Brook in Merrimack County, New Hampshire. It was built in 1960, so it is 65 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 582 vehicles a day, projected to reach 861 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesForest Road
CrossesWilliams Brook
Location0.10 MI FR Sargent ST
CountyMerrimack County
StateNew Hampshire
Coordinates43.42525, -71.59378
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic582 (2023)
Projected traffic861 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 Forest Road over Williams Brook built?

It was built in 1960, making it 65 years old in 2025.

What condition is Forest 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 Forest Road over Williams Brook carry?

About 582 vehicles per day (2023 count).

How long is Forest Road over Williams Brook?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns Forest Road over Williams Brook?

It is owned by the City or Municipal Highway Agency.