Lucas Creek: Agate & Carnelian Rockhounding in Lewis County, Washington

Updated June 2026

Lucas Creek is a mapped rockhounding spot in Lewis County, Washington. Reported finds include agate, carnelian, chalcedony, geode, jasper, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Lewis County
State: Washington
Nearest road: Senn Road
Postcode: 98532
Coordinates: 46.63892, -122.77233

Geology at Lucas Creek

This spot sits on alluvium, mapped as sand and gravel that formed within roughly the last 3 million years. Geodes weather out of their host rock and collect in gravels like these, where their round shape and light heft help them stand out.

Mapped unit: alluvium
Age: 3 Ma to present (Quaternary)
Rock types: sand and gravel
Elevation: 360 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 Lucas Creek

Best months: January to November. Typical highs run 77°F in midsummer and 45°F in midwinter, with winter lows near 34°F.

Climate normals: NOAA 1991-2020 monthlies, CENTRALIA station (10 mi away), adjusted for elevation.

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 Lucas Creek

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 Lucas Creek.

Across the state line from Lucas Creek

Lucas Creek is close enough to the Washington border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Lucas Creek FAQ

Where is Lucas Creek?+

Lucas Creek is in Lewis County, Washington, at 46.63892, -122.77233. Nearest road: Senn Road.

What rocks and minerals can you find at Lucas Creek?+

Lucas Creek is reported to produce Agate, Carnelian, Chalcedony, Geode, Jasper, Petrified Wood.

Is collecting allowed at Lucas Creek?+

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 Lucas Creek?+

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 Lucas Creek?+

The most comfortable months at Lucas Creek are January to November.

How do I get to Lucas Creek?+

Open the directions link to navigate to 46.63892, -122.77233 in Google Maps. The nearest road is Senn Road.

More rockhounding in Washington

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Open Lucas Creek on the map

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