O'Brien Lake   Be the first to submit input for O'Brien Lake. If you have info on O'Brien Lake, San Luis Obispo County, California please submit it here to improve this web site.          These outdoors activities are available near O'Brien Lake.   Hotels Near O'Brien Lake: Relax Inn, Paso Robles, 23 miles away Best Western Kettleman City Inn & Suites, Kettleman City, 25 miles away Super 8 Kettleman City, Kettleman City, 25 miles away La Quinta Inn & Suites Paso Robles, Paso Robles, 31 miles away Holiday Inn Express Hotel & Suites ATASCADERO, Atascadero, 32 miles away   Hiking Trails Near O'Brien Lake: Fernandez Trail, San Luis Obispo County, 17 miles away       2.6 hiking miles, 606 feet elevation difference