Waterville: Common Opal Rockhounding in Douglas County, Washington

Updated June 2026

Waterville is a mapped rockhounding spot in Douglas County, Washington. Reported finds include common opal. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Douglas County
State: Washington
Nearest road: West Locust Street
Postcode: 98858
Coordinates: 47.64739, -120.07150

Geology at Waterville

This spot sits on Palouse Formation, mapped as loess that formed within roughly the last 3 million years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit: Palouse Formation
Age: 3 Ma to present (Quaternary)
Rock types: loess
Elevation: 2,620 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 Waterville

Best months: March to October. Typical highs run 84°F in midsummer and 32°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, WATERVILLE station (0 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.

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 Waterville

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

Common Opal Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Waterville.

Waterville FAQ

Where is Waterville?+

Waterville is in Douglas County, Washington, at 47.64739, -120.07150. Nearest road: West Locust Street.

What rocks and minerals can you find at Waterville?+

Waterville is reported to produce Common Opal.

Is collecting allowed at Waterville?+

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 Waterville?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Waterville?+

The most comfortable months at Waterville are March to October.

How do I get to Waterville?+

Open the directions link to navigate to 47.64739, -120.07150 in Google Maps. The nearest road is West Locust Street.

More rockhounding in Washington

See all 92 Washington spots →

Open Waterville on the map

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