The west side of the mountain drains into the Little Hoosic River, thence into the Hoosic River, the Hudson River. The east side drains into the Hoosic River. Petersburg Pass, located on New York Route 2/ Massachusetts Route 2, cuts over the gap between Mount Raimer and the next summit to the north, Smith Hill, at an elevation of 1,650 feet (500 m), just .75 miles (1.21 km) north of the summit of Mount Raimer.