Republican River: Jasper Rockhounding in Red Willow County, Nebraska

Updated June 2026

Republican River is a mapped rockhounding spot in Red Willow County, Nebraska. Reported finds include jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Red Willow County
State: Nebraska
Coordinates: 40.18780, -100.57705

Geology at Republican River

This spot sits on Pierre Shale, mapped as shale that formed roughly 100 to 66 million years ago. Tough silica like agate, jasper, and chert typically weathers out of beds like these and collects as float in drainages and on deflation surfaces.

Mapped unit: Pierre Shale
Age: 100–66 Ma (Late Cretaceous)
Rock types: shale
Elevation: 2,460 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 Republican River

Best months: February to June. Typical highs run 92°F in midsummer and 42°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, MCCOOK MUNI AP station (1 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.

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

Found at Republican River

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Jasper Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Republican River.

Across the state line from Republican River

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

Republican River FAQ

Where is Republican River?+

Republican River is in Red Willow County, Nebraska, at 40.18780, -100.57705.

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

Republican River is reported to produce Jasper.

Is collecting allowed at Republican River?+

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 Republican River?+

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 Republican River?+

The most comfortable months at Republican River are February to June.

How do I get to Republican River?+

Open the directions link to navigate to 40.18780, -100.57705 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Nebraska

See all 32 Nebraska spots →

Open Republican River on the map

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