It has a drainage basin of 38.1 square miles (99 km2) and is part of the Lake Erie Watershed.

[3] A marina near the mouth of the creek, maintained by the Pennsylvania Fish and Boat Commission, offers access for fishers as well as boat access to Lake Erie.

[6] Like other tributaries of Lake Erie in Pennsylvania, Walnut Creek has eroded through glacial till and lake sediments and into sedimentary rock from the Devonian period, consisting mainly of shale interbedded with siltstone and sandstone.

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