Updated 9 Oct 2026, 2:58 am EDT. Get alerts for Rock Lake
National Weather Service; National Interagency Fire Center; U.S. EPA CyAN satellite; Michigan DHHS; Michigan DNR. Weather, warnings, fires and satellite refresh when you open the page (checked at most hourly).
Michigan DNR survey, fetched 7 Oct 2026. Not for navigation.
85 acres · deepest 30 ft (measured) · shoreline about 1.9 mi · clarity about 11 ft
Rock Lake is the 14th largest of the 71 named lakes of 10 acres or more in Dickinson County. By Michigan DNR survey it is the 8th deepest of the 15 with a measured depth. Its water is clearer than 45 of the other 60 lakes in the county with satellite clarity readings. Its shoreline measures about 1.9 miles along the state outline. About 0% of its area is deeper than 17 ft.
Ranks against Dickinson County lakes in Michigan hydrography, Michigan DNR lake surveys and Michigan EGLE satellite clarity; shoreline measured from the state outline. How we measure
1 public access site on Rock Lake.
Michigan DNR boating access, fetched 7 Oct 2026.
Average water clarity is about 11 ft (Secchi depth 3.4 m, satellite readings 2018–23).
Michigan EGLE satellite clarity, fetched 7 Oct 2026.
Michigan DNR survey; straight-line miles.
Rock Lake is 30 feet at its deepest point, measured by Michigan DNR survey. It covers 85 acres.
Yes. 1 public access site is listed: Rock Lake.
About 62% of the lake's area is deeper than 10 feet, measured from Michigan DNR depth contours.