US Bridges

NH155 over CSX

Good

Strafford County, New Hampshire · 1.4 MI from Durham Tl · Structure no. 015901150008500

Built
2007
18 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
190 ft
3 main spans
Daily traffic
9,859
2023 count
Owner
State
State Highway Agency

About this bridge

NH155 over CSX is a steel continuous stringer/multi-beam or girder carrying NH155 over CSX in Strafford County, New Hampshire. It was built in 2007, so it is 18 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 9,859 vehicles a day, roughly 4% of them trucks, projected to reach 14,591 by 2043. The structure is 190 ft (57.8 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesNH155
CrossesCSX
Location1.4 MI from Durham Tl
RouteState Highway 155
Coordinates43.16917, -70.92566
Functional classUrban Minor Arterial

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating75.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length190 ft (57.8 m)
Longest span72 ft (22 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,859 (2023)
Projected traffic14,591 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.2 mi (10 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NH155 over CSX built?

It was built in 2007, making it 18 years old in 2025.

What condition is NH155 over CSX 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 April 2023.

How much traffic does NH155 over CSX carry?

About 9,859 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH155 over CSX?

The structure is 190 ft (57.8 m) long with a longest span of 72 ft (22 m) and a deck 36 ft wide.

Who owns NH155 over CSX?

It is owned by the State Highway Agency.