US Bridges

NH120 over Mascoma River

Fair

Grafton County, New Hampshire · 0.7 MI from JCT I-89 · Structure no. 014401200011800

Built
1969
56 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
117 ft
1 main span
Daily traffic
5,317
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

NH120 over Mascoma River is a steel stringer/multi-beam or girder carrying NH120 over Mascoma River in Grafton 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,317 vehicles a day, roughly 5% of them trucks, projected to reach 7,869 by 2043. The structure is 117 ft (35.7 m) long and 58 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNH120
CrossesMascoma River
Location0.7 MI from JCT I-89
RouteState Highway 120
CountyGrafton County
StateNew Hampshire
Coordinates43.64326, -72.25459
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.7 US tons
Inventory rating41.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length117 ft (35.7 m)
Longest span113 ft (34.4 m)
Deck width58 ft (17.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,317 (2023)
Projected traffic7,869 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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)
NavigationNo navigation control on waterway

Frequently asked questions

When was NH120 over Mascoma River built?

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

What condition is NH120 over Mascoma River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does NH120 over Mascoma River carry?

About 5,317 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NH120 over Mascoma River?

The structure is 117 ft (35.7 m) long with a longest span of 113 ft (34.4 m) and a deck 58 ft wide.

Who owns NH120 over Mascoma River?

It is owned by the City or Municipal Highway Agency.