Walnut River: Geode Digging in Butler County, Kansas

Quick details

Access

Public area

County

Butler County

State

Kansas

Nearest road

Southwest 70th Street

Coordinates

37.72317, -96.90295

Geology at Walnut River

This spot sits on Alluvium, mapped as sand, silt, and clay that formed within roughly the last 3 million years. Geodes weather out of their host rock and collect in gravels like these, where their round shape and light heft help them stand out.

Mapped unit

Alluvium

Age

3 Ma to present (Pleistocene to Holocene)

Rock types

sand, silt, and clay

Elevation

1,260 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Walnut River

Best months: February to June. Typical highs run 91°F in midsummer and 44°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, EL DORADO station (7 mi away).

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 Walnut River

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

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