US Bridges

I-89 Nh 10 SB Ramp over Mascoma River Road-Gated

Fair

Grafton County, New Hampshire · 2.7 MI from Vt S.L. · Structure no. 014400990011100

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
209 ft
3 main spans
Daily traffic
4,655
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 Nh 10 SB Ramp over Mascoma River Road-Gated is a steel continuous stringer/multi-beam or girder carrying I-89 Nh 10 SB Ramp over Mascoma River Road-Gated in Grafton County, New Hampshire. It was built in 1966, so it is 59 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 fair condition with a lowest component rating of 5 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 4,655 vehicles a day, roughly 6% of them trucks, projected to reach 6,889 by 2043. The structure is 209 ft (63.7 m) long and 25 ft wide.

Location

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CarriesI-89 Nh 10 SB Ramp
CrossesMascoma River Road-Gated
Location2.7 MI from Vt S.L.
CountyGrafton County
StateNew Hampshire
Coordinates43.63908, -72.27831
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.2 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length209 ft (63.7 m)
Longest span87 ft (26.5 m)
Deck width25 ft (7.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,655 (2023)
Projected traffic6,889 by 2043
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-89 Nh 10 SB Ramp over Mascoma River Road-Gated built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-89 Nh 10 SB Ramp over Mascoma River Road-Gated 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 June 2023.

How much traffic does I-89 Nh 10 SB Ramp over Mascoma River Road-Gated carry?

About 4,655 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-89 Nh 10 SB Ramp over Mascoma River Road-Gated?

The structure is 209 ft (63.7 m) long with a longest span of 87 ft (26.5 m) and a deck 25 ft wide.

Who owns I-89 Nh 10 SB Ramp over Mascoma River Road-Gated?

It is owned by the State Highway Agency.