About this location
Poison Spider Creek runs through Natrona County west of Casper, on BLM land that also hosts the well-known Poison Spider OHV Park.[1] A hobbyist geology field guide (GemHunter's Guide) documents carnelian reported specifically "between Poison Spider and South Casper Creeks" west of Casper, a solid independent source rather than aggregator content.[2] The broader area sits within Wyoming's basin-fill geology, where Eocene and Oligocene volcanic and sedimentary deposits are known regionally for agate, jasper, and chalcedony. This is BLM public land with a real, if modest, documented mineral occurrence — a reasonable stop for a Casper-area rockhounding trip, not a marquee destination.
Always seek permission where required, follow local laws, and practice Leave No Trace. Locations and details are community-submitted and may be inaccurate. Not sure what's legal here? Read our full guide to rockhounding laws by land type.
Found Here
- Carnelian: A hobbyist field guide documents carnelian reported in the stretch of land between Poison Spider and South Casper Creeks, west of Casper.[2]
- Agate and chalcedony: Consistent with the general Eocene/Oligocene basin-fill and volcanic geology of the Casper area, though not specifically documented at this creek.
Difficulty
Getting there
Poison Spider Creek is west of Casper in Natrona County, accessible via Poison Spider Road, which also leads to the BLM's Poison Spider OHV Park.[1]
Collecting here
General field-collecting: surface-walk creek gravels and exposed cuts for carnelian and chalcedony float. No specific developed collecting site or trailhead is documented.
Know before you go
This is BLM-administered public land in Natrona County, part of the BLM Casper Field Office's jurisdiction. BLM land in Wyoming generally allows personal-use rock collecting — confirm current rules and any local restrictions directly with the BLM Casper Field Office (307-261-7600) before you go, since some tracts (including parts of the OHV park itself) may carry different rules.
Location on Map
Coordinates: 42.82019, -106.56354
Nearby rockhounding locations
- Clarkson Hill — Anatase, IlmeniteWY · 13.4 mi
- Casper — Agate, AlabasterWY · 14.4 mi
- Poison Spider — Anatase, IlmeniteWY · 14.8 mi
- Casper — Beryl, MuscoviteWY · 17.2 mi
- Deer Creek Canyon Mine — ChromiteWY · 28.4 mi
- PR-2 — FossilWY · 29.3 mi
Frequently asked questions
Is there rockhounding at Poison Spider Creek, Wyoming?
Yes. A hobbyist geology field guide documents carnelian in the area between Poison Spider and South Casper Creeks, west of Casper, on BLM public land.
Is Poison Spider Creek public land?
Yes. The area is administered by the BLM Casper Field Office, which also manages the adjacent Poison Spider OHV Park.
What can you find at Poison Spider Creek?
Carnelian is specifically documented in this area; agate and chalcedony are also plausible given the region's volcanic and sedimentary basin-fill geology, though not independently confirmed at this exact creek.
⚠️ Always verify current regulations, weather conditions, and access requirements before visiting any location. Information provided is based on community submissions and may not be current or accurate.
Sources
- WebSearch synthesis of BLM.gov pages for Poison Spider OHV Park, Natrona County, Wyoming — confirms BLM administration of the broader Poison Spider Road corridor.
- wyquartz.blogspot.com (GemHunter's Guide to Wyoming) — carnelian reported between Poison Spider and South Casper Creeks, west of Casper.
Recommended Gear for Wyoming
Estwing E3-22P Rock Pick
The industry-standard 22oz geological hammer. One-piece forged steel with shock-reduction grip.
Clear Anti-Fog Safety Glasses (4 Pack)
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Watertight Medical Kit
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Northwest Treasure Hunter's Gem and Mineral Guide
Whether you're digging for the first time or are an experienced rockhound or "prospector," with a simple rock hammer and...
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