US Bridges

Nh 16 SP Tpk over Cocheco River

Good

Strafford County, New Hampshire · 1.0 MI from Rt 16 · Structure no. 022201580011300

Built
2010
15 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
166 ft
1 main span
Daily traffic
39,653
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Nh 16 SP Tpk over Cocheco River is a steel stringer/multi-beam or girder carrying Nh 16 SP Tpk over Cocheco River in Strafford County, New Hampshire. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 39,653 vehicles a day, roughly 8% of them trucks, projected to reach 58,686 by 2043. The structure is 166 ft (50.6 m) long and 101 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNh 16 SP Tpk
CrossesCocheco River
Location1.0 MI from Rt 16
RouteState Highway 16
CountyStrafford County
StateNew Hampshire
Coordinates43.28164, -70.97744
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.5 US tons
Inventory rating51.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length166 ft (50.6 m)
Longest span160 ft (48.8 m)
Deck width101 ft (30.8 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39,653 (2023)
Projected traffic58,686 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 Nh 16 SP Tpk over Cocheco River built?

It was built in 2010, making it 15 years old in 2025.

What condition is Nh 16 SP Tpk 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 July 2023.

How much traffic does Nh 16 SP Tpk over Cocheco River carry?

About 39,653 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Nh 16 SP Tpk over Cocheco River?

The structure is 166 ft (50.6 m) long with a longest span of 160 ft (48.8 m) and a deck 101 ft wide.

Who owns Nh 16 SP Tpk over Cocheco River?

It is owned by the State Toll Authority.