US Bridges

Csah 1 over I 90

Fair

Mower County, Minnesota · 5.9 MI NE of JCT TH 16 · Structure no. 9705

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
268 ft
4 main spans
Daily traffic
545
2016 count
Owner
State
State Highway Agency

About this bridge

Csah 1 over I 90 is a prestressed concrete stringer/multi-beam or girder carrying Csah 1 over I 90 in Mower County, Minnesota. It was built in 1961, so it is 64 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 545 vehicles a day, projected to reach 545 by 2039. The structure is 268 ft (81.6 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesCsah 1
CrossesI 90
Location5.9 MI NE of JCT TH 16
RouteCounty Highway 1
CountyMower County
StateMinnesota
Coordinates43.77567, -92.62521
Functional classRural Minor Collector

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating39.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length268 ft (81.6 m)
Longest span88 ft (26.7 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic545 (2016)
Projected traffic545 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Csah 1 over I 90 built?

It was built in 1961, making it 64 years old in 2025.

What condition is Csah 1 over I 90 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 2024.

How much traffic does Csah 1 over I 90 carry?

About 545 vehicles per day (2016 count).

How long is Csah 1 over I 90?

The structure is 268 ft (81.6 m) long with a longest span of 88 ft (26.7 m) and a deck 33 ft wide.

Who owns Csah 1 over I 90?

It is owned by the State Highway Agency.