oregon route 241 (coos river highway) runs along the right bank of the river from allegany to the mouth. the millicoma meanders generally southwest, receiving woodruff creek from the left slightly downstream from allegany. deton creek enters from the right at rooke higgins county park near river mile (rm) 3.5 or river kilometer (rk) 5.6. about a half-mile later, hendrickson creek enters from the left. the millicoma receives matt davis creek from the right just before meeting the south fork coos river to form the coos river about from the larger stream's mouth on coos bay.