US Bridges

I-93 SB on Ramp over Nhrr Constitution Av.

Fair

Merrimack County, New Hampshire · 0.1 MI West of JCT I-93 · Structure no. 005201520010700

Built
1949
76 years old, rebuilt 1981
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
132 ft
2 main spans
Daily traffic
3,658
2023 count
Owner
State
State Highway Agency

About this bridge

I-93 SB on Ramp over Nhrr Constitution Av. is a steel continuous stringer/multi-beam or girder carrying I-93 SB on Ramp over Nhrr Constitution Av. in Merrimack County, New Hampshire. It was built in 1949 and reconstructed in 1981, so it is 76 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 5 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 3,658 vehicles a day, roughly 6% of them trucks, projected to reach 5,413 by 2043. The structure is 132 ft (40.2 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-93 SB on Ramp
CrossesNhrr Constitution Av.
Location0.1 MI West of JCT I-93
CountyMerrimack County
StateNew Hampshire
Coordinates43.21516, -71.53703
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length132 ft (40.2 m)
Longest span63 ft (19.2 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,658 (2023)
Projected traffic5,413 by 2043
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
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 on Ramp over Nhrr Constitution Av. built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1981.

What condition is I-93 SB on Ramp over Nhrr Constitution Av. 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 SB on Ramp over Nhrr Constitution Av. carry?

About 3,658 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-93 SB on Ramp over Nhrr Constitution Av.?

The structure is 132 ft (40.2 m) long with a longest span of 63 ft (19.2 m) and a deck 52 ft wide.

Who owns I-93 SB on Ramp over Nhrr Constitution Av.?

It is owned by the State Highway Agency.