Estabrook Park: Geode Digging in Milwaukee County, Wisconsin

Updated June 2026

Estabrook Park is a mapped rockhounding spot in Milwaukee County, Wisconsin. Reported finds include geode, millerite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Milwaukee County
State: Wisconsin
Nearest road: Milwaukee River Greenway Westside
Postcode: 53212
Coordinates: 43.10127, -87.91404

Geology at Estabrook Park

This spot sits on ground mapped as Milwaukee Formation that formed roughly 420 to 360 million years ago. Geodes typically weather free of their host rock and collect as rounded float in soils and drainages.

Mapped unit: Milwaukee Formation
Age: 420–360 Ma (Devonian)
Elevation: 630 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 Estabrook Park

Best months: March to November. Typical highs run 83°F in midsummer and 30°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, MT MARY COLLEGE station (6 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 Estabrook Park

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 Estabrook Park.

Estabrook Park FAQ

Where is Estabrook Park?+

Estabrook Park is in Milwaukee County, Wisconsin, at 43.10127, -87.91404. Nearest road: Milwaukee River Greenway Westside.

What rocks and minerals can you find at Estabrook Park?+

Estabrook Park is reported to produce Geode, Millerite.

Is collecting allowed at Estabrook Park?+

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.

What tools should I bring to Estabrook Park?+

Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.

When is the best time to visit Estabrook Park?+

The most comfortable months at Estabrook Park are March to November.

How do I get to Estabrook Park?+

Open the directions link to navigate to 43.10127, -87.91404 in Google Maps. The nearest road is Milwaukee River Greenway Westside.

More rockhounding in Wisconsin

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Open Estabrook Park on the map

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