Grubb Lake and Mud Lake — Rockhounding in Lancaster County, Pennsylvania

Grubb Lake and Mud Lake is a mapped rockhounding spot in Lancaster County, Pennsylvania. Reported finds include geode, limonite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Lancaster County
State: Pennsylvania
Nearest road: Ironville Pike
Postcode: 17512
Coordinates: 40.06010, -76.44938

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 Grubb Lake and Mud Lake

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 Grubb Lake and Mud Lake.

Across the state line from Grubb Lake and Mud Lake

Grubb Lake and Mud Lake is close enough to the Pennsylvania border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Grubb Lake and Mud Lake FAQ

Where is Grubb Lake and Mud Lake?+

Grubb Lake and Mud Lake is in Lancaster County, Pennsylvania, at 40.06010, -76.44938. Nearest road: Ironville Pike.

What rocks and minerals can you find at Grubb Lake and Mud Lake?+

Grubb Lake and Mud Lake is reported to produce Geode, Limonite.

Is collecting allowed at Grubb Lake and Mud Lake?+

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 Grubb Lake and Mud Lake?+

Open the directions link to navigate to 40.06010, -76.44938 in Google Maps. The nearest road is Ironville Pike.

More rockhounding in Pennsylvania

See all 86 Pennsylvania spots →

Open Grubb Lake and Mud Lake on the map

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