Where collection is allowed
Michigan EGLE and DNR identify public Great Lakes shorelines as popular rockhounding settings and limit removal from state-owned and public-trust land to 25 pounds total per person per year, subject to stricter local rules.
Choose a clearly public shoreline where local rules allow removal. Check parcel ownership, park orders, protected areas, tribal land, access hours, and parking before collecting.
Tools, limits, and timing
Tools and methods
Search loose wave-washed pebbles by eye or hand. Do not excavate bluffs, damage vegetation, use powered equipment, or take embedded bedrock.
Amount and use
No more than 25 pounds total per person per year from state-owned and public-trust land, and less wherever a site-specific rule applies.
Season and current status
Check waves, storms, ice, water level, smoke, and road conditions. Never search during dangerous surf.
Rules to confirm at the site
- Verify that access and collection are both allowed.
- Track annual weight.
- Take only loose ordinary stones.
- Leave artifacts and vertebrate fossils in place.
An old webpage, saved map, app layer, social post, or prior visit cannot override a current closure, posted boundary, permit condition, mining claim, staff instruction, or landowner decision.
What makes the site geologically useful
Glaciers transported a mixture of volcanic, sedimentary, and metamorphic rock to the basin; waves continually sort and polish loose material.
Lake Superior agate is banded chalcedony associated with ancient volcanic rocks, while fluorescent sodalite-bearing cobbles require ultraviolet light for confirmation.
A low-impact trip plan
- 1
Open the current official source and check alerts before leaving home.
- 2
Confirm the property boundary, parking location, and activity rules on arrival.
- 3
Begin with observation or surface searching and make the smallest possible disturbance.
- 4
Photograph context before handling any material that the current rules allow you to keep.
- 5
Pack out every item you brought and leave protected or uncertain material in place.
Site-specific preparation
- Cold water and waves can sweep visitors from rocks.
- Avoid unstable bluffs and private shoreline.
- A UV lamp should be used without shining it at people or wildlife.
Official sources
Open every relevant source shortly before departure. Fees, booking windows, fire rules, seasons, roads, and collection conditions can change without notice.
- Michigan rockhounding and identification guidance Michigan EGLE
- State land collecting limit Michigan Department of Natural Resources
Access and rule review: September 18, 2026. This guide is educational planning information, not a permit, reservation, boundary survey, or legal opinion.