Salmon River: Agate & Chalcedony Rockhounding in Idaho County, Idaho

Updated June 2026

Salmon River is a mapped rockhounding spot in Idaho County, Idaho. Reported finds include agate, chalcedony, jasper, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Idaho County
State: Idaho
Nearest road: Salmon River Trail #96
Coordinates: 45.46324, -115.78703

Geology at Salmon River

This spot sits on Idaho batholith, biotite-muscovite granite, mapped as two-mica granite that formed roughly 100 to 66 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: Idaho batholith, biotite-muscovite granite
Age: 100–66 Ma (Late Cretaceous)
Rock types: two-mica granite
Elevation: 2,080 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 Salmon River

Best months: September to June. Typical highs run 93°F in midsummer and 49°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, WARREN station (15 mi away), adjusted for elevation.

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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 Salmon 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 Salmon River.

Across the state line from Salmon River

Salmon River 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.

Salmon River FAQ

Where is Salmon River?+

Salmon River is in Idaho County, Idaho, at 45.46324, -115.78703. Nearest road: Salmon River Trail #96.

What rocks and minerals can you find at Salmon River?+

Salmon River is reported to produce Agate, Chalcedony, Jasper, Petrified Wood.

Is collecting allowed at Salmon River?+

Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Salmon River?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Salmon River?+

The most comfortable months at Salmon River are September to June.

How do I get to Salmon River?+

Open the directions link to navigate to 45.46324, -115.78703 in Google Maps. The nearest road is Salmon River Trail #96.

More rockhounding in Idaho

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Open Salmon River on the map

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