US Bridges

Islington Street over US 1 Bypass

Good

Rockingham County, New Hampshire · 1.0 MI from JCT US 1 · Structure no. 021701880009700

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
136 ft
2 main spans
Daily traffic
4,516
2023 count
Owner
State
State Highway Agency

About this bridge

Islington Street over US 1 Bypass is a steel continuous stringer/multi-beam or girder carrying Islington Street over US 1 Bypass in Rockingham County, New Hampshire. It was built in 2015, so it is 10 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 4,516 vehicles a day, roughly 5% of them trucks, projected to reach 6,683 by 2043. The structure is 136 ft (41.4 m) long and 38 ft wide.

CarriesIslington Street
CrossesUS 1 Bypass
Location1.0 MI from JCT US 1
RouteCity Street 0
Coordinates43.06583, -70.77647
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 inspectionJune 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 alignment7: Better than present minimum criteria
Operating rating65.1 US tons
Inventory rating50.2 US tons

Structure

MaterialSteel Continuous
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length136 ft (41.4 m)
Longest span67 ft (20.4 m)
Deck width38 ft (11.7 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,516 (2023)
Projected traffic6,683 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
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 Islington Street over US 1 Bypass built?

It was built in 2015, making it 10 years old in 2025.

What condition is Islington Street over US 1 Bypass 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 June 2023.

How much traffic does Islington Street over US 1 Bypass carry?

About 4,516 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Islington Street over US 1 Bypass?

The structure is 136 ft (41.4 m) long with a longest span of 67 ft (20.4 m) and a deck 38 ft wide.

Who owns Islington Street over US 1 Bypass?

It is owned by the State Highway Agency.