5 miles southwest of Grass Lake
Jackson County, Michigan · 42.1933° N, 84.2691° W
The Michigan DNR lists no public access site on Olcott Lake; much of the shore may be private.
Updated 14 Oct 2026, 6:20 pm EDT. Get alerts for Olcott 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.
42 acres · deepest 25 ft (measured) · shoreline about 1.6 mi · clarity about 8 ft
Olcott Lake is the 55th largest of the 108 named lakes of 10 acres or more in Jackson County. By Michigan DNR survey it is the 20th deepest of the 40 with a measured depth. Its water is clearer than 35 of the other 92 lakes in the county with satellite clarity readings. Its shoreline measures about 1.6 miles along the state outline. About 24% of its area is deeper than 15 ft.
Ranks against Jackson County lakes in Michigan hydrography, Michigan DNR lake surveys and Michigan EGLE satellite clarity; shoreline measured from the state outline. How we measure
Average water clarity is about 8 ft (Secchi depth 2.4 m, satellite readings 2018–23).
Michigan EGLE satellite clarity, fetched 7 Oct 2026.
41 other lakes of 10+ acres within about 7 miles of Olcott Lake, 4 with a page here (darker blue). Sources: Michigan DNR, US Census Bureau.
Michigan DNR survey; straight-line miles.
Olcott Lake is 25 feet at its deepest point, measured by Michigan DNR survey. It covers 42 acres.
About 30% of the lake's area is deeper than 10 feet, measured from Michigan DNR depth contours.