US Bridges

Main Street over Cocheco River

Good

Strafford County, New Hampshire · 3.1 MI Dover Tl · Structure no. 022201690011200

Built
1986
39 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
114 ft
2 main spans
Daily traffic
8,305
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main Street over Cocheco River is a steel continuous stringer/multi-beam or girder carrying Main Street over Cocheco River in Strafford 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 8,305 vehicles a day, roughly 3% of them trucks, projected to reach 12,291 by 2043. The structure is 114 ft (34.7 m) long and 45 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMain Street
CrossesCocheco River
Location3.1 MI Dover Tl
RouteCity Street 0
Coordinates43.27416, -70.97703
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating49.1 US tons
Inventory rating36 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length114 ft (34.7 m)
Longest span55 ft (16.8 m)
Deck width45 ft (13.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,305 (2023)
Projected traffic12,291 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 Main Street over Cocheco River built?

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

What condition is Main 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 August 2023.

How much traffic does Main Street over Cocheco River carry?

About 8,305 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Main Street over Cocheco River?

The structure is 114 ft (34.7 m) long with a longest span of 55 ft (16.8 m) and a deck 45 ft wide.

Who owns Main Street over Cocheco River?

It is owned by the City or Municipal Highway Agency.