US Bridges

NH101 over Nh 28 Bypass

Good

Hillsborough County, New Hampshire · .2 MI W. Auburn T.L. · Structure no. 016101130014800

Built
1961
64 years old, rebuilt 2004
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
55,538
2023 count
Owner
State
State Highway Agency

About this bridge

NH101 over Nh 28 Bypass is a steel stringer/multi-beam or girder carrying NH101 over Nh 28 Bypass in Hillsborough County, New Hampshire. It was built in 1961 and reconstructed in 2004, so it is 64 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 55,538 vehicles a day, roughly 8% of them trucks, projected to reach 82,196 by 2043. The structure is 85 ft (25.9 m) long and 90 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNH101
CrossesNh 28 Bypass
Location.2 MI W. Auburn T.L.
RouteState Highway 101
Coordinates43.00671, -71.39484
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure8 Very GoodNo problems noted.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.8 US tons
Inventory rating53.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length85 ft (25.9 m)
Longest span79 ft (24.1 m)
Deck width90 ft (27.4 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55,538 (2023)
Projected traffic82,196 by 2043
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
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 NH101 over Nh 28 Bypass built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2004.

What condition is NH101 over Nh 28 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 April 2023.

How much traffic does NH101 over Nh 28 Bypass carry?

About 55,538 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is NH101 over Nh 28 Bypass?

The structure is 85 ft (25.9 m) long with a longest span of 79 ft (24.1 m) and a deck 90 ft wide.

Who owns NH101 over Nh 28 Bypass?

It is owned by the State Highway Agency.