Best spot

Arkansas River at Great Bend: Agate & Jasper Rockhounding in Barton County, Kansas

Updated July 2026

At Great Bend the Arkansas River swings east and begins its 192-mile National Water Trail run to the Oklahoma line, a designation that gives the public access to sandbars and gravel islands along the route. The river's gravels carry agate, jasper, chalcedony, and petrified wood washed down from the Rocky Mountains and the High Plains. The Arkansas is one of only three navigable rivers in Kansas, so its bed is public land. Reported finds include agate, jasper, chalcedony, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Arkansas River at Great Bend photos

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

1 photo

Aerial view of the Arkansas River winding past Great Bend, Barton County, Kansas, seen from the International Space Station

Quick details

Access: Public area
County: Barton County
State: Kansas
Nearest road: Arkansas River Water Trail
Postcode: 67530
Coordinates: 38.34750, -98.77450

Geology at Arkansas River at Great Bend

This spot sits on Alluvium, mapped as sand, silt, and clay 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 (Pleistocene to Holocene)
Rock types: sand, silt, and clay
Elevation: 1,870 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 Arkansas River at Great Bend

Best months: February to June. Typical highs run 91°F in midsummer and 42°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, GREAT BEND 3WNW 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.

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

Found at Arkansas River at Great Bend

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 Arkansas River at Great Bend.

Arkansas River at Great Bend FAQ

Where is Arkansas River at Great Bend?+

Arkansas River at Great Bend is in Barton County, Kansas, at 38.34750, -98.77450. Nearest road: Arkansas River Water Trail.

What rocks and minerals can you find at Arkansas River at Great Bend?+

Arkansas River at Great Bend is reported to produce Agate, Jasper, Chalcedony, Petrified Wood.

Is collecting allowed at Arkansas River at Great Bend?+

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 Arkansas River at Great Bend?+

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 Arkansas River at Great Bend?+

The most comfortable months at Arkansas River at Great Bend are February to June.

How do I get to Arkansas River at Great Bend?+

Open the directions link to navigate to 38.34750, -98.77450 in Google Maps. The nearest road is Arkansas River Water Trail.

More rockhounding in Kansas

See all 50 Kansas spots →

Open Arkansas River at Great Bend on the map

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