US Bridges

Whittier Street over Cocheco River

Good

Strafford County, New Hampshire · Off Downtown Dover · Structure no. 006501110013200

Built
2018
7 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
167 ft
1 main span
Daily traffic
4,392
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Whittier Street over Cocheco River is a steel stringer/multi-beam or girder carrying Whittier Street over Cocheco River in Strafford County, New Hampshire. It was built in 2018, so it is 7 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 4,392 vehicles a day, roughly 3% of them trucks, projected to reach 6,500 by 2043. The structure is 167 ft (51 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesWhittier Street
CrossesCocheco River
LocationOff Downtown Dover
RouteCity Street 0
Coordinates43.20505, -70.89334
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating45.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length167 ft (51 m)
Longest span158 ft (48.2 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,392 (2023)
Projected traffic6,500 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Whittier Street over Cocheco River built?

It was built in 2018, making it 7 years old in 2025.

What condition is Whittier Street over Cocheco 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 Whittier Street over Cocheco River carry?

About 4,392 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Whittier Street over Cocheco River?

The structure is 167 ft (51 m) long with a longest span of 158 ft (48.2 m) and a deck 36 ft wide.

Who owns Whittier Street over Cocheco River?

It is owned by the City or Municipal Highway Agency.