US Bridges

Nh 16 SP Tpk Ramp over Cocheco R. Backwater

Good

Strafford County, New Hampshire · SB Offramp/ Cocheco Bkwtr · Structure no. 022201070009000

Built
2012
13 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
231 ft
2 main spans
Daily traffic
2,885
2023 count
Owner
Toll Authority
State Toll Authority

About this bridge

Nh 16 SP Tpk Ramp over Cocheco R. Backwater is a steel continuous stringer/multi-beam or girder carrying Nh 16 SP Tpk Ramp over Cocheco R. Backwater in Strafford County, New Hampshire. It was built in 2012, so it is 13 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 2,885 vehicles a day, roughly 5% of them trucks, projected to reach 4,269 by 2043. The structure is 231 ft (70.4 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesNh 16 SP Tpk Ramp
CrossesCocheco R. Backwater
LocationSB Offramp/ Cocheco Bkwtr
CountyStrafford County
StateNew Hampshire
Coordinates43.32066, -70.99437
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 protection9 ExcellentNo problems noted.
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating99 US tons
Inventory rating58.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans2
Design loadHS 25 or greater
Structure length231 ft (70.4 m)
Longest span112 ft (34.1 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,885 (2023)
Projected traffic4,269 by 2043
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Ramp over Cocheco R. Backwater built?

It was built in 2012, making it 13 years old in 2025.

What condition is Nh 16 SP Tpk Ramp over Cocheco R. Backwater 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 Ramp over Cocheco R. Backwater carry?

About 2,885 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 16 SP Tpk Ramp over Cocheco R. Backwater?

The structure is 231 ft (70.4 m) long with a longest span of 112 ft (34.1 m) and a deck 31 ft wide.

Who owns Nh 16 SP Tpk Ramp over Cocheco R. Backwater?

It is owned by the State Toll Authority.