US Bridges

I-93 SB over Bridge Street

Fair

Hillsborough County, New Hampshire · 1.2 MI W JCT NH28 Byp · Structure no. 016101280012400

Built
1977
48 years old, rebuilt 1999
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
1 main span
Daily traffic
28,328
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB over Bridge Street is a steel stringer/multi-beam or girder carrying I-93 SB over Bridge Street in Hillsborough County, New Hampshire. It was built in 1977 and reconstructed in 1999, so it is 48 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 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 28,328 vehicles a day, roughly 6% of them trucks, projected to reach 41,925 by 2043. The structure is 66 ft (20.1 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-93 SB
CrossesBridge Street
Location1.2 MI W JCT NH28 Byp
RouteInterstate 93
CountyHillsborough County
StateNew Hampshire
Coordinates42.99366, -71.41786
Functional classUrban 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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.2 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length66 ft (20.1 m)
Longest span60 ft (18.3 m)
Deck width62 ft (18.9 m)
Roadway width58 ft (17.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,328 (2023)
Projected traffic41,925 by 2043
Trucks6%
Lanes on structure3
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-93 SB over Bridge Street built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 1999.

What condition is I-93 SB over Bridge 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 Bridge Street carry?

About 28,328 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-93 SB over Bridge Street?

The structure is 66 ft (20.1 m) long with a longest span of 60 ft (18.3 m) and a deck 62 ft wide.

Who owns I-93 SB over Bridge Street?

It is owned by the State Highway Agency.