Mattawa — Rockhounding in Grant County, Washington

Mattawa 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
Coordinates: 46.77474, -119.84886

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.

Found at Mattawa

Each chip links to all spots in the U.S. that produce that material.

Opalized Wood

Nearby rockhounding spots

Other rockhounding spots within driving distance of Mattawa.

Mattawa FAQ

Where is Mattawa?+

Mattawa is in Grant County, Washington, at 46.77474, -119.84886.

What rocks and minerals can you find at Mattawa?+

Mattawa is reported to produce Opalized Wood.

Is collecting allowed at Mattawa?+

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 Mattawa?+

Open the directions link to navigate to 46.77474, -119.84886 in Google Maps. Some spots are remote — check road conditions before driving out.

More rockhounding in Washington

See all 92 Washington spots →

Open Mattawa on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.