the location is farmland now, close to the town of Manson which is off of Highway 20. the highway goes through Fort Dodge to the east, Sioux City to the west.

here is another explanation from NASA, thought that was interesting...

https://ntrs.nasa.gov/citations/19890011955

the crator is farmland now, close to the town of Manson which is right off of Highway 20. the highway goes through Fort Dodge to the east, Sioux City to the west.