US Bridges

I-93 Parkway over Ped Underpass

Good

Grafton County, New Hampshire · 7.4MI No Woodstock T.L. · Structure no. 014800880011200

Built
1985
40 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
11,599
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 Parkway over Ped Underpass is a concrete culvert carrying I-93 Parkway over Ped Underpass in Grafton County, New Hampshire. It was built in 1985, so it is 40 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 11,599 vehicles a day, roughly 9% of them trucks, projected to reach 17,166 by 2043. The structure is 28 ft (8.5 m) long and 131 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 Parkway
CrossesPed Underpass
Location7.4MI No Woodstock T.L.
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.14277, -71.68206
Functional classRural 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
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.2 US tons
Inventory rating49.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width131 ft (39.9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,599 (2023)
Projected traffic17,166 by 2043
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
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-93 Parkway over Ped Underpass built?

It was built in 1985, making it 40 years old in 2025.

What condition is I-93 Parkway over Ped Underpass 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 May 2023.

How much traffic does I-93 Parkway over Ped Underpass carry?

About 11,599 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 Parkway over Ped Underpass?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m) and a deck 131 ft wide.

Who owns I-93 Parkway over Ped Underpass?

It is owned by the State Highway Agency.