Grand Coulee — Rockhounding in Grant County, Washington

Grand Coulee is a mapped rockhounding spot in Grant County, Washington. Reported finds include opalized wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Grant County
State: Washington
Nearest road: Alcan Road Northeast
Postcode: 99133
Coordinates: 47.92966, -119.00715

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.

State guidance last verified: April 1, 2026

Washington Geological Survey (DNR)
Stonerose Interpretive Center — Visit & rules
BLM Spokane District
Community submissions reviewed against published agency rules

Found at Grand Coulee

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

Opalized Wood Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Grand Coulee.

Grand Coulee FAQ

Where is Grand Coulee?+

Grand Coulee is in Grant County, Washington, at 47.92966, -119.00715. Nearest road: Alcan Road Northeast.

What rocks and minerals can you find at Grand Coulee?+

Grand Coulee is reported to produce Opalized Wood.

Is collecting allowed at Grand Coulee?+

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 Grand Coulee?+

Open the directions link to navigate to 47.92966, -119.00715 in Google Maps. The nearest road is Alcan Road Northeast.

More rockhounding in Washington

See all 92 Washington spots →

Open Grand Coulee on the map

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