US Bridges

I 90 over Im Rail; Csah 46

Poor

Freeborn County, Minnesota · 6.6 MI E of JCT TH 35 · Structure no. 9728

Built
1967
58 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
250 ft
4 main spans
Daily traffic
6,350
2019 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, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,350 vehicles a day, roughly 13% of them trucks, projected to reach 6,000 by 2039. The structure is 250 ft (76.3 m) long and 36 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
Coordinates43.6614, -93.19835
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.8 US tons
Inventory rating38.9 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 width36 ft (10.9 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,350 (2019)
Projected traffic6,000 by 2039
Trucks13%
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.

What condition is I 90 over Im Rail; Csah 46 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

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

About 6,350 vehicles per day (2019 count), of which roughly 13% 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 36 ft wide.

Who owns I 90 over Im Rail; Csah 46?

It is owned by the State Highway Agency.