Big Blue River — Rockhounding in Marshall County, Kansas

Big Blue River is a mapped rockhounding spot in Marshall County, Kansas. Reported finds include agate, chalcedony, chert, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Marshall County
State: Kansas
Nearest road: East Avenue
Postcode: 66411
Coordinates: 39.69102, -96.65462

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Big Blue River

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Big Blue River.

Across the state line from Big Blue River

Big Blue River is close enough to the Kansas border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Big Blue River FAQ

Where is Big Blue River?+

Big Blue River is in Marshall County, Kansas, at 39.69102, -96.65462. Nearest road: East Avenue.

What rocks and minerals can you find at Big Blue River?+

Big Blue River is reported to produce Agate, Chalcedony, Chert, Jasper.

Is collecting allowed at Big Blue River?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

How do I get to Big Blue River?+

Open the directions link to navigate to 39.69102, -96.65462 in Google Maps. The nearest road is East Avenue.

More rockhounding in Kansas

See all 46 Kansas spots →

Open Big Blue River on the map

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