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Snake River: Fire Opal Rockhounding in Asotin County, Washington

Updated June 2026

Snake River is a mapped rockhounding spot in Asotin County, Washington. Reported finds include fire opal. Below: coordinates, access notes, nearby spots, and trip-planning links.

Map showing Snake River in Asotin County, Washington

Quick details

Access
Public area
Nearest road
Snake River Road

Geology at Snake River

This spot sits on Grande Ronde Basalt, mapped as basalt that formed roughly 23 to 5 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit
Grande Ronde Basalt
Age
23–5 Ma (Miocene)
Rock types
basalt
Elevation
990 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 Snake River

Best months: February to June. Typical highs run 92°F in midsummer and 44°F in midwinter, with winter lows near 32°F.

Climate normals: NOAA 1991-2020 monthlies, LEWISTON AP station (8 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:

Found at Snake River

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 Snake River.

Across the state line from Snake River

Snake River 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.

Snake River FAQ

Where is Snake River?+
Snake River is in Asotin County, Washington, at 46.26525, -116.96914. Nearest road: Snake River Road.
What rocks and minerals can you find at Snake River?+
Snake River is reported to produce Fire Opal.
Is collecting allowed at Snake River?+
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 Snake River?+
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 Snake River?+
The most comfortable months at Snake River are February to June.
How do I get to Snake River?+
Open the directions link to navigate to 46.26525, -116.96914 in Google Maps. The nearest road is Snake River Road.

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