Prairie Coteau Watershed Improvement & Protection Project

South Red Iron Lake is located in central Marshall County, South Dakota. Major land use in the watershed is range and pasture land.  South Red Iron was previously called Cottonwood Lake in the 1910 atlas. 



South Red Iron

Maximum Depth: 15 feet 

Mean Depth: 8 feet

Lake Volume: 5,064 acre-ft

Surface Area: 7610 acres 

Shoreline Length: 7.5 miles

Watershed Acres: 26,477 acres


Major Tributaries: Two small unnamed tributaries, one acts as an inlet/outlet dependent on lake levels from North Red Iron Lake.


Warm Water Permanent Fisheries: black bullhead, black crappie, bluegill, common carp, fathead minnow, largemouth bass, northern pike, smallmouth bass, walleye, white sucker, yellow perch.


For more information on South Red Iron Lake, click on the following links:


Watershed Map


SD GF&P Lake Contour Map