US Bridges

Csah 3 over Mississippi River

Fair

Cass County, Minnesota · 0.4 MI N of JCT CR 139 · Structure no. 11511

Built
1979
46 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
248 ft
3 main spans
Daily traffic
265
2015 count
Owner
County
County Highway Agency

About this bridge

Csah 3 over Mississippi River is a prestressed concrete stringer/multi-beam or girder carrying Csah 3 over Mississippi River in Cass County, Minnesota. It was built in 1979, so it is 46 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 265 vehicles a day, projected to reach 265 by 2039. The structure is 248 ft (75.5 m) long and 35 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

CarriesCsah 3
CrossesMississippi River
Location0.4 MI N of JCT CR 139
RouteCounty Highway 3
Coordinates47.30205, -93.90152
Functional classRural Major 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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.1 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length248 ft (75.5 m)
Longest span80 ft (24.4 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic265 (2015)
Projected traffic265 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 3 over Mississippi River built?

It was built in 1979, making it 46 years old in 2025.

What condition is Csah 3 over Mississippi River 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 Csah 3 over Mississippi River carry?

About 265 vehicles per day (2015 count).

How long is Csah 3 over Mississippi River?

The structure is 248 ft (75.5 m) long with a longest span of 80 ft (24.4 m) and a deck 35 ft wide.

Who owns Csah 3 over Mississippi River?

It is owned by the County Highway Agency.