US Bridges

I 90 over Im Rail

Fair

Martin County, Minnesota · 1.5 MI E of JCT TH 4 · Structure no. 46807

Built
1973
52 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
145 ft
3 main spans
Daily traffic
3,711
2021 count
Owner
State
State Highway Agency

About this bridge

I 90 over Im Rail is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Im Rail in Martin County, Minnesota. It was built in 1973, so it is 52 years old, older than the Minnesota average of 38.5 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 3,711 vehicles a day, roughly 30% of them trucks, projected to reach 4,150 by 2041. The structure is 145 ft (44.1 m) long and 44 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesI 90
CrossesIm Rail
Location1.5 MI E of JCT TH 4
RouteInterstate 90
CountyMartin County
StateMinnesota
Coordinates43.66685, -94.70427
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 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 rating78.3 US tons
Inventory rating41.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length145 ft (44.1 m)
Longest span47 ft (14.4 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,711 (2021)
Projected traffic4,150 by 2041
Trucks30%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost$488 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over Im Rail built?

It was built in 1973, making it 52 years old in 2025.

What condition is I 90 over Im Rail 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 September 2023.

How much traffic does I 90 over Im Rail carry?

About 3,711 vehicles per day (2021 count), of which roughly 30% are trucks.

How long is I 90 over Im Rail?

The structure is 145 ft (44.1 m) long with a longest span of 47 ft (14.4 m) and a deck 44 ft wide.

Who owns I 90 over Im Rail?

It is owned by the State Highway Agency.