US Bridges

I-89 SB Off Ramp over Plaza Connector Road

Good

Grafton County, New Hampshire · SB Off Ramp at Exit 20 · Structure no. 014400480009800

Built
2012
13 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
55 ft
1 main span
Daily traffic
8,958
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB Off Ramp over Plaza Connector Road is a concrete stringer/multi-beam or girder carrying I-89 SB Off Ramp over Plaza Connector Road in Grafton County, New Hampshire. It was built in 2012, so it is 13 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,958 vehicles a day, projected to reach 13,257 by 2043. The structure is 55 ft (16.8 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesI-89 SB Off Ramp
CrossesPlaza Connector Road
LocationSB Off Ramp at Exit 20
CountyGrafton County
StateNew Hampshire
Coordinates43.63182, -72.32327
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating46.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length55 ft (16.8 m)
Longest span48 ft (14.5 m)
Deck width33 ft (10.1 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,958 (2023)
Projected traffic13,257 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
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 I-89 SB Off Ramp over Plaza Connector Road built?

It was built in 2012, making it 13 years old in 2025.

What condition is I-89 SB Off Ramp over Plaza Connector Road 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 June 2023.

How much traffic does I-89 SB Off Ramp over Plaza Connector Road carry?

About 8,958 vehicles per day (2023 count).

How long is I-89 SB Off Ramp over Plaza Connector Road?

The structure is 55 ft (16.8 m) long with a longest span of 48 ft (14.5 m) and a deck 33 ft wide.

Who owns I-89 SB Off Ramp over Plaza Connector Road?

It is owned by the State Highway Agency.