The Great Eastern Tributaries of the Allegheny. There are a number of important tributaries, running about parallel to each other from the east to the west into the Allegheny. These are (from south to north): Crooked Creek, Mahoning Creek, Red Bank-Sandy Lick Creek and Clarion River. Crooked Creek is good, indeed, one of the best creeks in the state, yet in the region of its headwaters pollution begins. Near Creekside, Indiana County, new mines have been opened during the last years, and a small tributary discharges here a considerable amount of mine water into Crooked Creek, killing the fauna for several miles. Of course this is bound to become worse in the future. Mahoning Creek is utterly polluted, the pollution beginning in the region of Punxsutawney in Jefferson County, and consisting chiefly of mine water. yet a tributary, Little Mahoning Creek in northern Indiana County, has clear water, and a corresponding rich fauna. Red Band-Sandy Lick Creek also is polluted, chiefly by mine water, which reaches it from the numerous mines existing in its drainage basin.