Polly Creek and Little Polly Creek drain a combined watershed of 16,113 acres (6,521 ha), on the southern flank of an unnamed ridge that extends southeast from the summit of Mount Redoubt, and flow generally south for 9 miles (14.5 km) and 8 miles (12.8 km) respectively to the western shore of Cook Inlet, about 56 miles (90 km) northwest of Homer and 46 miles (74 km) southwest of Kenai, Alaska.