US Bridges

I 90 over Im Rail; Csah 46

Fair

Freeborn County, Minnesota · 6.6 MI E of JCT TH 35 · Structure no. 9727

Built
1967
58 years old, rebuilt 1983
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
250 ft
4 main spans
Daily traffic
6,000
2017 count
Owner
State
State Highway Agency

About this bridge

I 90 over Im Rail; Csah 46 is a steel continuous stringer/multi-beam or girder carrying I 90 over Im Rail; Csah 46 in Freeborn County, Minnesota. It was built in 1967 and reconstructed in 1983, so it is 58 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 6,000 vehicles a day, roughly 17% of them trucks, projected to reach 6,000 by 2039. The structure is 250 ft (76.3 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesI 90
CrossesIm Rail; Csah 46
Location6.6 MI E of JCT TH 35
RouteInterstate 90
CountyFreeborn County
StateMinnesota
Coordinates43.66149, -93.19797
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 rating66.1 US tons
Inventory rating39.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length250 ft (76.3 m)
Longest span73 ft (22.2 m)
Deck width43 ft (13.1 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2017)
Projected traffic6,000 by 2039
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over Im Rail; Csah 46 built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1983.

What condition is I 90 over Im Rail; Csah 46 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 August 2023.

How much traffic does I 90 over Im Rail; Csah 46 carry?

About 6,000 vehicles per day (2017 count), of which roughly 17% are trucks.

How long is I 90 over Im Rail; Csah 46?

The structure is 250 ft (76.3 m) long with a longest span of 73 ft (22.2 m) and a deck 43 ft wide.

Who owns I 90 over Im Rail; Csah 46?

It is owned by the State Highway Agency.