US Bridges

I-89 SB over NH103

Fair

Merrimack County, New Hampshire · 6.3 MI Hopkinton Tl · Structure no. 026301640010300

Built
1968
57 years old, rebuilt 1993
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
10,849
2023 count
Owner
State
State Highway Agency

About this bridge

I-89 SB over NH103 is a steel stringer/multi-beam or girder carrying I-89 SB over NH103 in Merrimack County, New Hampshire. It was built in 1968 and reconstructed in 1993, 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 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 10,849 vehicles a day, roughly 9% of them trucks, projected to reach 16,056 by 2043. The structure is 90 ft (27.4 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-89 SB
CrossesNH103
Location6.3 MI Hopkinton Tl
RouteInterstate 89
CountyMerrimack County
StateNew Hampshire
Coordinates43.28917, -71.83668
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
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.3 US tons
Inventory rating33.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length90 ft (27.4 m)
Longest span85 ft (25.8 m)
Deck width44 ft (13.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,849 (2023)
Projected traffic16,056 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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-89 SB over NH103 built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1993.

What condition is I-89 SB over NH103 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-89 SB over NH103 carry?

About 10,849 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is I-89 SB over NH103?

The structure is 90 ft (27.4 m) long with a longest span of 85 ft (25.8 m) and a deck 44 ft wide.

Who owns I-89 SB over NH103?

It is owned by the State Highway Agency.