Best spot

Platte River: Agate & Chalcedony Rockhounding in Buffalo County, Nebraska

Updated July 2026

The braided Platte at Kearney concentrates agate, chalcedony, jasper, and petrified wood in its gravel bars, all tumbled east from the Rockies and the western Nebraska gravels. It is the most accessible central-Nebraska river collecting for the I-80 corridor. Reported finds include agate, chalcedony, jasper, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Platte River photos

Public image records connected to this spot or its reported material.

1 photo

The braided Platte River with sandbars and gravel bars at the Nebraska 44 crossing in Kearney, Buffalo County, Nebraska

Quick details

Access: Public area
County: Buffalo County
State: Nebraska
Nearest road: Huron Drive
Postcode: 68849
Coordinates: 40.66114, -99.07084

Geology at Platte River

This spot sits on Ogallala Group or Formation, mapped as siltstone mudstone and conglomerate sandstone that formed roughly 23 to 5 million years ago. Sedimentary beds like these are the typical host for petrified and silicified wood, which weathers out as durable float on slopes and in washes.

Mapped unit: Ogallala Group or Formation
Age: 23–5 Ma (Miocene)
Rock types: siltstone mudstone and conglomerate sandstone
Elevation: 2,140 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 Platte River

Best months: March to November. Typical highs run 87°F in midsummer and 36°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, KEARNEY 4 NE station (5 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 Platte 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 Platte River.

Across the state line from Platte River

Platte 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.

NortonNorton County, Kansas · 71 mi awayQuartz Concretions

Platte River FAQ

Where is Platte River?+

Platte River is in Buffalo County, Nebraska, at 40.66114, -99.07084. Nearest road: Huron Drive.

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

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

Is collecting allowed at Platte 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 Platte 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 Platte River?+

The most comfortable months at Platte River are March to November.

How do I get to Platte River?+

Open the directions link to navigate to 40.66114, -99.07084 in Google Maps. The nearest road is Huron Drive.

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