US Bridges

Csah 21 over Minnesota River

Fair

Yellow Medicine County, Minnesota · 0.4 MI N of JCT TH 67 · Structure no. 87505

Built
1968
57 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
331 ft
3 main spans
Daily traffic
287
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 21 over Minnesota River is a steel continuous stringer/multi-beam or girder carrying Csah 21 over Minnesota River in Yellow Medicine County, Minnesota. It was built in 1968, so it is 57 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 287 vehicles a day, projected to reach 265 by 2041. The structure is 331 ft (100.9 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCsah 21
CrossesMinnesota River
Location0.4 MI N of JCT TH 67
RouteCounty Highway 21
CountyYellow Medicine County
StateMinnesota
Coordinates44.7315, -95.42096
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.5 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length331 ft (100.9 m)
Longest span125 ft (38.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic287 (2021)
Projected traffic265 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 21 over Minnesota River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Csah 21 over Minnesota 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 21 over Minnesota River carry?

About 287 vehicles per day (2021 count).

How long is Csah 21 over Minnesota River?

The structure is 331 ft (100.9 m) long with a longest span of 125 ft (38.1 m) and a deck 33 ft wide.

Who owns Csah 21 over Minnesota River?

It is owned by the County Highway Agency.