Little Eagle: Petrified Wood & Opal Rockhounding in Corson County, South Dakota

Updated July 2026

Little Eagle is a mapped rockhounding spot in Corson County, South Dakota. Reported finds include petrified wood, opal. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Corson County
State: South Dakota
Postcode: 57639
Coordinates: 45.67735, -100.78262

Geology at Little Eagle

This spot sits on Alluvium, mapped as coarse alluvium and fine alluvium that formed within roughly the last 3 million years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.

Mapped unit: Alluvium
Age: 3 Ma to present (Quaternary)
Rock types: coarse alluvium and fine alluvium
Elevation: 1,620 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 Little Eagle

Best months: April to October. Typical highs run 87°F in midsummer and 26°F in midwinter, with winter lows near 5°F.

Climate normals: NOAA 1991-2020 monthlies, MC LAUGHLIN 2SW station (8 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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Little Eagle

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 Little Eagle.

Across the state line from Little Eagle

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

Little Eagle FAQ

Where is Little Eagle?+

Little Eagle is in Corson County, South Dakota, at 45.67735, -100.78262.

What rocks and minerals can you find at Little Eagle?+

Little Eagle is reported to produce Petrified Wood, Opal.

Is collecting allowed at Little Eagle?+

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 Little Eagle?+

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 Little Eagle?+

The most comfortable months at Little Eagle are April to October.

How do I get to Little Eagle?+

Open the directions link to navigate to 45.67735, -100.78262 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in South Dakota

See all 43 South Dakota spots →

Open Little Eagle on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.