This very large unit is formed by the Toutle River in the north, loosely following the I-5 to the west down to the dam on Lake Merwin, before winding its way north in a very crooked line. The Coweeman unit is mostly private land with a very small percentage of public land in the form of DNR, Cowlitz County and state lands. Weyerhaeuser is the largest landowner with the north. The western and southern borders and along Rose Valley Road, which dissects the unit in half north to south, are comprised of small personal properties. Modest in elevation, this steep heavily forested area has been heavily logged, especially in the south and the west creating a vast network of roads, even though most are behind locked gates. The landlocked state ground may take some hiking to get to. Both the blacktail deer and elk are in abundance within the unit.

Access to private land is getting harder to find.