US Bridges

White Oaks Road over Suncook River

Good

Belknap County, New Hampshire · 0.3 MI FR Gilmanton Tl · Structure no. 001401060017700

Built
1986
39 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
76 ft
1 main span
Daily traffic
1,167
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

White Oaks Road over Suncook River is a steel stringer/multi-beam or girder carrying White Oaks Road over Suncook River in Belknap County, New Hampshire. It was built in 1986, so it is 39 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 1,167 vehicles a day, roughly 4% of them trucks, projected to reach 1,727 by 2043. The structure is 76 ft (23.2 m) long and 31 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesWhite Oaks Road
CrossesSuncook River
Location0.3 MI FR Gilmanton Tl
Coordinates43.4016, -71.28946
Functional classRural Minor 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.
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 alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length76 ft (23.2 m)
Longest span70 ft (21.3 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,167 (2023)
Projected traffic1,727 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 White Oaks Road over Suncook River built?

It was built in 1986, making it 39 years old in 2025.

What condition is White Oaks Road over Suncook River 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 White Oaks Road over Suncook River carry?

About 1,167 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is White Oaks Road over Suncook River?

The structure is 76 ft (23.2 m) long with a longest span of 70 ft (21.3 m) and a deck 31 ft wide.

Who owns White Oaks Road over Suncook River?

It is owned by the City or Municipal Highway Agency.