Yellowstone News and Information

  News Release Yellowstone National Park to remove invasive fish from Buffalo Creek Temporary creek closure Aug. 31 – Sept. 7 to protect native trout populations Biologist starts rotenone treatment NPS / Jacob W. Frank News Release Date:  August 25, 2026 Contact:   Yellowstone Public Affairs , (307) 344-2015 MAMMOTH HOT SPRINGS, Wyo.  – Beginning Aug. 31, Yellowstone National Park will temporarily close Buffalo Creek, a tributary of Slough Creek in the northern part of the park, for treatment to remove invasive fish as part of ongoing conservation efforts to preserve native species. It will reopen to the public on Sept. 7. Buffalo Creek will be  closed to the public  from the northern park boundary downstream to its confluence with Slough Creek while biologists remove invasive rainbow trout by applying the EPA-approved piscicide rotenone. The treatment will not affect the potability of water at Slough Creek Campground and will be safe to drink. Signs w...