Look at a map of the Southwest Washington game units and straddling the Cascade Mountains are Siouxon, Lewis River and Packwood — hundreds of square miles of public land.Then look at the bottom of the state statistics for deer harvest and there are those same units — with single-digit success rates about half or less the regional average.WHEN: Most of Western Washington is open Oct. 15-31 and Nov. 17-20. Grayback and East Klickitat are open Oct. 15-28.COST: A state resident deer license is $45.90. For youth age 15 and younger, the cost is $19.80Hunters know deer are more dense in the Klickitat units, or the low-elevation areas closer to Interstate 5, than in the units high in the southern Cascades of Washington.“Habitat is really what controls the deer population,” said Eric Holman, a wildlife biologist for the Washington Department of Fish and Wildlife. “Those 20- and 30-year-old clearcuts (in the Cascade units) are not good habitat for deer. Those have dense canopies that don’t allow light to get to the forest floor and grow much in the way of preferred food for deer.”To understand the relative scarcity of deer in places like Siouxon, Lewis River and Packwood, it’s necessary to know the land management history of the area.