4 miles southeast of Ortonville
Oakland County, Michigan · 42.8066° N, 83.3792° W
The Michigan DNR lists no public access site on Seymour Lake; much of the shore may be private.
Updated 14 Oct 2026, 6:15 pm EDT. Get alerts for Seymour 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.
58 acres · deepest 21 ft (measured) · shoreline about 1.6 mi · clarity about 9 ft
Seymour Lake is the 97th largest of the 290 named lakes of 10 acres or more in Oakland County. By Michigan DNR survey it is the 87th deepest of the 104 with a measured depth. Its water is clearer than 91 of the other 248 lakes in the county with satellite clarity readings. Its shoreline measures about 1.6 miles along the state outline. About 21% of its area is deeper than 15 ft.
Ranks against Oakland 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 9 ft (Secchi depth 2.8 m, satellite readings 2018–23).
Michigan EGLE satellite clarity, fetched 7 Oct 2026.
62 other lakes of 10+ acres within about 6 miles of Seymour Lake, 2 with a page here (darker blue). Sources: Michigan DNR, US Census Bureau.
Michigan DNR survey; straight-line miles.
Seymour Lake is 21 feet at its deepest point, measured by Michigan DNR survey. It covers 58 acres.
About 33% of the lake's area is deeper than 10 feet, measured from Michigan DNR depth contours.