US Bridges

I-93 SB over Nhrr

Good

Grafton County, New Hampshire · 4.7 MI Plymouth Tl · Structure no. 003501370012300

Built
1968
57 years old, rebuilt 2003
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
10,052
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Nhrr is a steel stringer/multi-beam or girder carrying I-93 SB over Nhrr in Grafton County, New Hampshire. It was built in 1968 and reconstructed in 2003, so it is 57 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 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 10,052 vehicles a day, roughly 10% of them trucks, projected to reach 14,876 by 2043. The structure is 90 ft (27.3 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesI-93 SB
CrossesNhrr
Location4.7 MI Plymouth Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates43.84445, -71.64685
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.3 US tons
Inventory rating57.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length90 ft (27.3 m)
Longest span80 ft (24.4 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,052 (2023)
Projected traffic14,876 by 2043
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.8 mi (11 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 SB over Nhrr built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2003.

What condition is I-93 SB over Nhrr 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 April 2023.

How much traffic does I-93 SB over Nhrr carry?

About 10,052 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-93 SB over Nhrr?

The structure is 90 ft (27.3 m) long with a longest span of 80 ft (24.4 m) and a deck 44 ft wide.

Who owns I-93 SB over Nhrr?

It is owned by the State Highway Agency.