Middle Fork Teanaway River: Geode Digging in Kittitas County, Washington

Updated June 2026

Middle Fork Teanaway River is a mapped rockhounding spot in Kittitas County, Washington. Reported finds include agate, chalcedony geode. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Kittitas County
State: Washington
Nearest road: Middle Fork Teanaway Road
Coordinates: 47.29713, -120.96228

Geology at Middle Fork Teanaway River

This spot sits on Teanaway Basalt, mapped as basalt flows that formed roughly 56 to 34 million years ago. Volcanic rock like this is classic geode and thunderegg country: gas cavities in the old flows can line themselves with quartz or agate over time.

Mapped unit: Teanaway Basalt
Age: 56–34 Ma (Eocene)
Rock types: basalt flows
Elevation: 2,650 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 Middle Fork Teanaway River

Best months: March to October. Typical highs run 78°F in midsummer and 32°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, CLE ELUM 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: April 1, 2026

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

Found at Middle Fork Teanaway 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 Middle Fork Teanaway River.

Middle Fork Teanaway River FAQ

Where is Middle Fork Teanaway River?+

Middle Fork Teanaway River is in Kittitas County, Washington, at 47.29713, -120.96228. Nearest road: Middle Fork Teanaway Road.

What rocks and minerals can you find at Middle Fork Teanaway River?+

Middle Fork Teanaway River is reported to produce Agate, Chalcedony Geode.

Is collecting allowed at Middle Fork Teanaway 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 Middle Fork Teanaway River?+

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 Middle Fork Teanaway River?+

The most comfortable months at Middle Fork Teanaway River are March to October.

How do I get to Middle Fork Teanaway River?+

Open the directions link to navigate to 47.29713, -120.96228 in Google Maps. The nearest road is Middle Fork Teanaway Road.

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