US Bridges

NH122 Main ST over NH101

Good

Hillsborough County, New Hampshire · 2.8 MI Milford Tl · Structure no. 000701350010900

Built
1969
56 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
91 ft
1 main span
Daily traffic
6,868
2023 count
Owner
State
State Highway Agency

About this bridge

NH122 Main ST over NH101 is a steel stringer/multi-beam or girder carrying NH122 Main ST over NH101 in Hillsborough County, New Hampshire. It was built in 1969, so it is 56 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 6,868 vehicles a day, roughly 4% of them trucks, projected to reach 10,164 by 2043. The structure is 91 ft (27.7 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNH122 Main ST
CrossesNH101
Location2.8 MI Milford Tl
RouteState Highway 0
CountyHillsborough County
StateNew Hampshire
Coordinates42.86613, -71.61362
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 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 rating60.6 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length91 ft (27.7 m)
Longest span87 ft (26.5 m)
Deck width47 ft (14.3 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,868 (2023)
Projected traffic10,164 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 NH122 Main ST over NH101 built?

It was built in 1969, making it 56 years old in 2025.

What condition is NH122 Main ST over 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 December 2023.

How much traffic does NH122 Main ST over NH101 carry?

About 6,868 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH122 Main ST over NH101?

The structure is 91 ft (27.7 m) long with a longest span of 87 ft (26.5 m) and a deck 47 ft wide.

Who owns NH122 Main ST over NH101?

It is owned by the State Highway Agency.