High Quality Content by WIKIPEDIA articles! Raft River National Forest was established as the Raft River Forest Reserve in Utah and Idaho on November 5, 1906 with 410,247 acres (1,660.21 km2). It became a National Forest on March 4, 1907. On July 1, 1908 it was combined with Cassia National Forest to create Minidoka National Forest. The name was discontinued. The lands exist presently in Sawtooth National Forest.