Emmett: Blue Agate & Opal Rockhounding in Gem County, Idaho

Updated June 2026

Emmett is a mapped rockhounding spot in Gem County, Idaho. Reported finds include blue agate, opal. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Gem County
State: Idaho
Nearest road: Payette Riverwalk Trail
Postcode: 83617
Coordinates: 43.87753, -116.51827

Geology at Emmett

This spot sits on Alluvial deposits, mapped as gravel, sand, and silt that formed within roughly the last 3 million years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit: Alluvial deposits
Age: 3 Ma to present (Quaternary)
Rock types: gravel, sand, and silt
Elevation: 2,350 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 Emmett

Best months: February to June. Typical highs run 92°F in midsummer and 38°F in midwinter, with winter lows near 23°F.

Climate normals: NOAA 1991-2020 monthlies, EMMETT 2 E station (3 mi away).

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

Idaho Panhandle National Forests — Emerald Creek
Idaho Geological Survey
Spencer Opal Mines (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Emmett

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 Emmett.

Across the state line from Emmett

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

Emmett FAQ

Where is Emmett?+

Emmett is in Gem County, Idaho, at 43.87753, -116.51827. Nearest road: Payette Riverwalk Trail.

What rocks and minerals can you find at Emmett?+

Emmett is reported to produce Blue Agate, Opal.

Is collecting allowed at Emmett?+

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 Emmett?+

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 Emmett?+

The most comfortable months at Emmett are February to June.

How do I get to Emmett?+

Open the directions link to navigate to 43.87753, -116.51827 in Google Maps. The nearest road is Payette Riverwalk Trail.

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