US Bridges

I-93 SB over Owl Street

Fair

Grafton County, New Hampshire · 0.7 MI Thornton Tl · Structure no. 003501330014400

Built
1968
57 years old, rebuilt 2003
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
7,613
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Owl Street is a steel stringer/multi-beam or girder carrying I-93 SB over Owl Street 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 fair condition with a lowest component rating of 6 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 7,613 vehicles a day, roughly 10% of them trucks, projected to reach 11,267 by 2043. The structure is 78 ft (23.9 m) long and 44 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesI-93 SB
CrossesOwl Street
Location0.7 MI Thornton Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates43.85925, -71.65232
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
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 rating99 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length78 ft (23.9 m)
Longest span72 ft (21.9 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,613 (2023)
Projected traffic11,267 by 2043
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.3 mi (23 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 Owl Street 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 Owl Street 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 April 2023.

How much traffic does I-93 SB over Owl Street carry?

About 7,613 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-93 SB over Owl Street?

The structure is 78 ft (23.9 m) long with a longest span of 72 ft (21.9 m) and a deck 44 ft wide.

Who owns I-93 SB over Owl Street?

It is owned by the State Highway Agency.