US Bridges

US 3 over Kimball Brook

Good

Coos County, New Hampshire · 8.5 MI to Northumberland · Structure no. 024400380019000

Built
1956
69 years old
Condition
Good
inspected June 2023
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
2,647
2023 count
Owner
State
State Highway Agency

About this bridge

US 3 over Kimball Brook is a concrete frame carrying US 3 over Kimball Brook in Coos County, New Hampshire. It was built in 1956, so it is 69 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 2,647 vehicles a day, roughly 7% of them trucks, projected to reach 3,917 by 2043. The structure is 25 ft (7.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 3
CrossesKimball Brook
Location8.5 MI to Northumberland
RouteU.S. Route 3
CountyCoos County
StateNew Hampshire
Coordinates44.74025, -71.62222
Functional classRural Minor Arterial

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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.4 US tons
Inventory rating45.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width44 ft (13.3 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,647 (2023)
Projected traffic3,917 by 2043
Trucks7%
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

OwnerState Highway Agency
Maintained byState 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 US 3 over Kimball Brook built?

It was built in 1956, making it 69 years old in 2025.

What condition is US 3 over Kimball 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 June 2023.

How much traffic does US 3 over Kimball Brook carry?

About 2,647 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 3 over Kimball Brook?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m) and a deck 44 ft wide.

Who owns US 3 over Kimball Brook?

It is owned by the State Highway Agency.