US Bridges

Main Street over Kings Brook

Good

Merrimack County, New Hampshire · 1.8 Mi. Newbury Tl · Structure no. 025000970008800

Built
2007
18 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
887
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main Street over Kings Brook is a concrete slab carrying Main Street over Kings Brook in Merrimack County, New Hampshire. It was built in 2007, so it is 18 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 887 vehicles a day, roughly 4% of them trucks, projected to reach 1,312 by 2043. The structure is 25 ft (7.7 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain Street
CrossesKings Brook
Location1.8 Mi. Newbury Tl
Coordinates43.3341, -71.95412
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating86.9 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length25 ft (7.7 m)
Longest span25 ft (7.7 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic887 (2023)
Projected traffic1,312 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Main Street over Kings Brook built?

It was built in 2007, making it 18 years old in 2025.

What condition is Main Street over Kings 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 September 2024.

How much traffic does Main Street over Kings Brook carry?

About 887 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Main Street over Kings Brook?

The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.7 m) and a deck 32 ft wide.

Who owns Main Street over Kings Brook?

It is owned by the City or Municipal Highway Agency.