Open to fishing all year. 5 bass per day, only 1 bass over 15 inches may be harvested. A single dead adult quagga mussel was found out of water on the shoreline at Prineville Reservoir on June 6 during a routine survey for aquatic invasive species. The public is encouraged to report any suspicious sightings to the Oregon Invasive Species Hotline at 1‑866‑INVADER or online at https://oregoninvasiveshotline.org to support ongoing monitoring and early detection efforts. Anglers report fair trout and bass fishing. Prineville Reservoir was stocked with over 100 trophy largemouth bass in May. Prineville Reservoir has been drawn down to the 3210' elevation resulting in the closure of the Powder House Cove boat ramp for the season.