This run can be divided into a couple of sections. The first half from the 6450 Bridge (just upstream of the Weyerhauser gate) to the 8100 Bridge contains a number of good class II rapids. The one class III rapid is What's That Falls, a river wide ledge that is easy to scout from river left.
Those just looking for a short class II/III run may take out at the 8100 Bridge but for those who want to check out the most challenging drop on this run, you can continue downstream. The river passes through a mini gorge just downstream of the bridge and then you reach the horizon line at Leader Rapids. This boulder garden has a good line down the left and at higher flows you can pick your way through the boulders on river right. A couple more class II rapids follow but then the pace calms down considerably. You can continue on down to the fish hatchery which is about 4 miles of class I floating, or find a take-out along the road. Pay attention to private property though as there are several houses all along this section.
If you continue on down to the fish hatchery you can portage Lower Kalama Falls on river left and continue on with another two miles of great class III/IV down to Red Barn (the
Lower Kalama run).
The gauge on the Kalama is
located here. 500 cfs and up is best, Leader Rapids get harder below that, but the run was reported to still be enjoyable at 400 cfs.