US Bridges

I-89 SB over Plaza Connector Road

Good

Grafton County, New Hampshire · 0.4 MI East of Vt/Nh Line · Structure no. 014400490009900

Built
2012
13 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
57 ft
1 main span
Daily traffic
18,618
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB over Plaza Connector Road is a concrete stringer/multi-beam or girder carrying I-89 SB 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 18,618 vehicles a day, roughly 50% of them trucks, projected to reach 27,554 by 2043. The structure is 57 ft (17.5 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-89 SB
CrossesPlaza Connector Road
Location0.4 MI East of Vt/Nh Line
RouteState Highway 0I-89
CountyGrafton County
StateNew Hampshire
Coordinates43.632, -72.32302
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 rating82.8 US tons
Inventory rating49.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length57 ft (17.5 m)
Longest span49 ft (14.9 m)
Deck width64 ft (19.4 m)
Roadway width60 ft (18.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,618 (2023)
Projected traffic27,554 by 2043
Trucks50%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 SB over Plaza Connector Road built?

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

What condition is I-89 SB 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 over Plaza Connector Road carry?

About 18,618 vehicles per day (2023 count), of which roughly 50% are trucks.

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

The structure is 57 ft (17.5 m) long with a longest span of 49 ft (14.9 m) and a deck 64 ft wide.

Who owns I-89 SB over Plaza Connector Road?

It is owned by the State Highway Agency.