US Bridges

Nh 75 Central ST over Cocheco River

Good

Strafford County, New Hampshire · .14 Mi. W. Jct. Nh 11 · Structure no. 008400870013500

Built
1985
40 years old
Condition
Good
inspected May 2024
Type
Frame
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
2,963
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 75 Central ST over Cocheco River is a concrete continuous frame carrying Nh 75 Central ST over Cocheco River in Strafford County, New Hampshire. It was built in 1985, so it is 40 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 2,963 vehicles a day, roughly 4% of them trucks, projected to reach 4,385 by 2043. The structure is 36 ft (11 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNh 75 Central ST
CrossesCocheco River
Location.14 Mi. W. Jct. Nh 11
RouteState Highway 75
CountyStrafford County
StateNew Hampshire
Coordinates43.38839, -71.06907
Functional classRural Major 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 inspectionMay 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 alignment6: Equal to present minimum criteria
Operating rating95.8 US tons
Inventory rating57.4 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length36 ft (11 m)
Longest span14 ft (4.3 m)
Deck width38 ft (11.6 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,963 (2023)
Projected traffic4,385 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 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 75 Central ST over Cocheco River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Nh 75 Central ST 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 May 2024.

How much traffic does Nh 75 Central ST over Cocheco River carry?

About 2,963 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Nh 75 Central ST over Cocheco River?

The structure is 36 ft (11 m) long with a longest span of 14 ft (4.3 m) and a deck 38 ft wide.

Who owns Nh 75 Central ST over Cocheco River?

It is owned by the State Highway Agency.