Jenny Creek: Agate & Carnelian Rockhounding in Siskiyou County, California

Updated June 2026

Jenny Creek is a mapped rockhounding spot in Siskiyou County, California. Reported finds include agate, carnelian, petrified wood, fossils. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Siskiyou County
State: California
Nearest road: Copco Road
Coordinates: 41.97692, -122.39778

Geology at Jenny Creek

This spot sits on volcanic flow rocks, unit 17 (Cascade Range), mapped as andesite and basalt that formed roughly 28 to 2 million years ago. Fossils are uncommon in volcanic rock itself; look to any interbedded sediments and ash beds, where plant material and bone are typically preserved.

Mapped unit: volcanic flow rocks, unit 17 (Cascade Range)
Age: 28–2 Ma (Late Oligocene to Pleistocene)
Rock types: andesite and basalt
Elevation: 2,370 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 Jenny Creek

Best months: September to June. Typical highs run 94°F in midsummer and 49°F in midwinter, with winter lows near 28°F.

Climate normals: NOAA 1991-2020 monthlies, COPCO #1 DAM station (3 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

BLM California — Recreational mineral collecting
California Geological Survey
CDFW — Suction Dredge Mining Permit Program
Community submissions reviewed against published agency rules

Found at Jenny 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 Jenny Creek.

Across the state line from Jenny Creek

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

Jenny Creek FAQ

Where is Jenny Creek?+

Jenny Creek is in Siskiyou County, California, at 41.97692, -122.39778. Nearest road: Copco Road.

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

Jenny Creek is reported to produce Agate, Carnelian, Petrified Wood, Fossils.

Is collecting allowed at Jenny 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 Jenny Creek?+

A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.

When is the best time to visit Jenny Creek?+

The most comfortable months at Jenny Creek are September to June.

How do I get to Jenny Creek?+

Open the directions link to navigate to 41.97692, -122.39778 in Google Maps. The nearest road is Copco Road.

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