US Bridges

Nh 28A over I-93

Good

Hillsborough County, New Hampshire · 0.1 MI Hooksett Tl · Structure no. 016101020010800

Built
1976
49 years old, rebuilt 2021
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
307 ft
2 main spans
Daily traffic
6,695
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 28A over I-93 is a steel continuous stringer/multi-beam or girder carrying Nh 28A over I-93 in Hillsborough County, New Hampshire. It was built in 1976 and reconstructed in 2021, so it is 49 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 6,695 vehicles a day, roughly 5% of them trucks, projected to reach 9,908 by 2043. The structure is 307 ft (93.6 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesNh 28A
CrossesI-93
Location0.1 MI Hooksett Tl
RouteState Highway 28A
CountyHillsborough County
StateNew Hampshire
Coordinates43.01362, -71.43625
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating29.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length307 ft (93.6 m)
Longest span150 ft (45.7 m)
Deck width52 ft (16 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,695 (2023)
Projected traffic9,908 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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 Nh 28A over I-93 built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2021.

What condition is Nh 28A over I-93 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 Nh 28A over I-93 carry?

About 6,695 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 28A over I-93?

The structure is 307 ft (93.6 m) long with a longest span of 150 ft (45.7 m) and a deck 52 ft wide.

Who owns Nh 28A over I-93?

It is owned by the State Highway Agency.