US Bridges

Nh 28 over I-293 NH101

Good

Hillsborough County, New Hampshire · 1.8 MI N Londonderry Tl · Structure no. 016101760009900

Built
1960
65 years old, rebuilt 1996
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
173 ft
3 main spans
Daily traffic
35,231
2023 count
Owner
State
State Highway Agency

About this bridge

Nh 28 over I-293 NH101 is a steel continuous stringer/multi-beam or girder carrying Nh 28 over I-293 NH101 in Hillsborough County, New Hampshire. It was built in 1960 and reconstructed in 1996, so it is 65 years old, older 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 35,231 vehicles a day, roughly 5% of them trucks, projected to reach 52,141 by 2043. The structure is 173 ft (52.7 m) long and 130 ft wide.

CarriesNh 28
CrossesI-293 NH101
Location1.8 MI N Londonderry Tl
RouteState Highway 28
Coordinates42.9569, -71.43609
Functional classUrban Other Principal 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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.8 US tons
Inventory rating57.4 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length173 ft (52.7 m)
Longest span56 ft (17.1 m)
Deck width130 ft (39.6 m)
Roadway width118 ft (36 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,231 (2023)
Projected traffic52,141 by 2043
Trucks5%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 28 over I-293 NH101 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1996.

What condition is Nh 28 over I-293 NH101 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 28 over I-293 NH101 carry?

About 35,231 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Nh 28 over I-293 NH101?

The structure is 173 ft (52.7 m) long with a longest span of 56 ft (17.1 m) and a deck 130 ft wide.

Who owns Nh 28 over I-293 NH101?

It is owned by the State Highway Agency.