Grouse Creek

Grouse Creek is in Washington County, Idaho, near Weiser, in a part of the state known for colorful agate — including the harder-to-find iris agate, prized for the iridescence it shows when cut into thin slabs. A rockhounding-directory source specifically names Grouse Creek as producing banded and iris agate, with roads described as well-marked. That's a thin source, though — a general collecting guide rather than a mining-district report or geological survey — so treat the specific creek claim as plausible but not independently confirmed. The broader Washington County agate country (which also includes petrified wood from Mann Creek, northwest of Weiser) is well established; Grouse Creek specifically is less so.

Grouse Creek is in Washington County, Idaho, near Weiser. No specific mileage or trailhead was documented in the sources found; general guidance describes the access roads as well-marked.

Surface/float collecting typical of Idaho agate country — walking gravel bars and float fields rather than digging. Iris agate is usually only identified after cutting and polishing, since its iridescence isn't obvious in the rough.

Land status unverified — confirm ownership and permission before visiting. Washington County, Idaho is a mix of BLM, U.S. Forest Service, and private ranch land; no source confirmed which applies at Grouse Creek specifically. Check with the Idaho Department of Lands or BLM's local office for current status before planning a trip.