Northeast Glacial Lakes Watershed Improvement & Protection Project

Roy Lake is located in central Marshall County.  The major land use in the watershed is range and pastureland.  The majority of the lake’s shoreline is undeveloped and owned by the SD Dept. of Game, Fish, and Parks as Game Production Areas.  Approximately 150 lake homes are found along the east and north shores of the lake, as well as Roy Lake State Park.  The lake was named after the first white settlement established on the lake by the Roi family

Roy Lake

Maximum Depth: 20.6 feet 

Mean Depth: 10 feet

Lake Volume: 20,540 acre-ft.

Surface Area: 2,054 acres 

Shoreline Length: 14.5 miles

Watershed Acres: 9,614 acres


Major Tributaries: One unnamed tributary enters north from Cottonwood Lake, a second tributary enters east from Clear Lake, and a short tributary comes from Bullhead Lake located to the west.  Roy Lake's outlet flows into Lost Lake


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


For more information on Roy Lake, click on the following links:


Watershed Map


SD GF&P Lake Contour Map


Roy Lake State Park