Yellowstone River - Bratten Fishing Access: Montana Moss Agate & Petrified Wood Rockhounding in Sweet Grass County, Montana

Updated August 2026

Yellowstone River - Bratten Fishing Access is a mapped rockhounding spot in Sweet Grass County, Montana. Reported finds include montana moss agate, petrified wood, jasper, chalcedony. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sweet Grass County
State: Montana
Nearest road: Highway 10
Postcode: 59069
Coordinates: 45.71804, -109.63260

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.

State guidance last verified: April 1, 2026

BLM Montana, Recreational mineral collecting
Montana Bureau of Mines and Geology
Gem Mountain Sapphire Mine (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Yellowstone River - Bratten Fishing Access

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 Yellowstone River - Bratten Fishing Access.

Yellowstone River - Bratten Fishing Access FAQ

Where is Yellowstone River - Bratten Fishing Access?+

Yellowstone River - Bratten Fishing Access is in Sweet Grass County, Montana, at 45.71804, -109.63260. Nearest road: Highway 10.

What rocks and minerals can you find at Yellowstone River - Bratten Fishing Access?+

Yellowstone River - Bratten Fishing Access is reported to produce Montana Moss Agate, Petrified Wood, Jasper, Chalcedony.

Is collecting allowed at Yellowstone River - Bratten Fishing Access?+

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 Yellowstone River - Bratten Fishing Access?+

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.

How do I get to Yellowstone River - Bratten Fishing Access?+

Open the directions link to navigate to 45.71804, -109.63260 in Google Maps. The nearest road is Highway 10.

More rockhounding in Montana

See all 106 Montana spots →

Open Yellowstone River - Bratten Fishing Access on the map

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