US Bridges

I-93 NB over Cottage Street

Fair

Grafton County, New Hampshire · 0.4 MI Bethlehem Tl · Structure no. 015302110004000

Built
1959
66 years old, rebuilt 1991
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
4,927
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 NB over Cottage Street is a steel stringer/multi-beam or girder carrying I-93 NB over Cottage Street in Grafton County, New Hampshire. It was built in 1959 and reconstructed in 1991, so it is 66 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 4,927 vehicles a day, roughly 9% of them trucks, projected to reach 7,291 by 2043. The structure is 65 ft (19.8 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 NB
CrossesCottage Street
Location0.4 MI Bethlehem Tl
RouteInterstate 93
CountyGrafton County
StateNew Hampshire
Coordinates44.29552, -71.76863
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length65 ft (19.8 m)
Longest span60 ft (18.3 m)
Deck width44 ft (13.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,927 (2023)
Projected traffic7,291 by 2043
Trucks9%
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 NB over Cottage Street built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1991.

What condition is I-93 NB over Cottage 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 May 2023.

How much traffic does I-93 NB over Cottage Street carry?

About 4,927 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-93 NB over Cottage Street?

The structure is 65 ft (19.8 m) long with a longest span of 60 ft (18.3 m) and a deck 44 ft wide.

Who owns I-93 NB over Cottage Street?

It is owned by the State Highway Agency.