Devil's Lake

Devil's Lake State Park, near Baraboo, Wisconsin, is built around 500-foot quartzite bluffs from the ancient Baraboo Range — rock roughly 1.6 billion years old, among the oldest exposed outcrops in North America, later carved by a Wisconsin-era glacier that dammed the valley to form the lake. It's one of Wisconsin's most geologically significant parks, and that's exactly why it's not a collecting site: general sourcing on Wisconsin park rules specifically names Devil's Lake as a park where rock and mineral collecting is prohibited. The DB's listed specimen — Lake Superior agate — doesn't actually match this park's geology anyway; those agates are glacially-transported material found broadly across Wisconsin's gravel and till deposits (including well outside the Lake Superior region itself), not something specific to the quartzite bluffs here. This page is worth publishing as a geology-and-history stop, not a dig guide.

Devil's Lake State Park is just south of Baraboo, Wisconsin, in Sauk County, easily reached off Highway 12/159.

Not applicable — see access notes below. If you're after Lake Superior agates in Wisconsin generally, that means working glacial gravel pits and roadcuts in the Driftless Area and central Wisconsin, not the park's quartzite bluffs.

General sourcing on Wisconsin state park rules states plainly that Devil's Lake State Park, along with other geologically significant Wisconsin parks, prohibits rock and mineral collecting outright. This sits within Wisconsin's broader state park framework (Wis. Admin. Code NR 45.04), which otherwise allows limited hand-collecting elsewhere with written property-manager permission and strict weight caps — see Wisconsin DNR's gathering rules. Devil's Lake itself is treated as an exception to that general allowance. Confirm current rules with the park office at (608) 356-8301 before assuming any collecting is permitted.