Reservoir Creek begins in a valley on Little Wilkes-Barre Mountain in Newport Township.

It flows east for several tenths of a mile before entering a pond and turning north.

After several tenths of a mile, the creek leaves Little Wilkes-Barre Mountain and turns north-northwest, flowing along the border of Wanamie.

After a short distance, it turns north and reaches its confluence with South Branch Newport Creek.

[1] The entire length of Reservoir Creek is considered by the Pennsylvania Department of Environmental Protection to be impaired by abandoned mine drainage due to pH and siltation.

The lower reaches of Reservoir Creek are on soil of the Udorthents-Urban Land-Volusia series.

[2] Reservoir Creek is entirely within the United States Geological Survey quadrangle of Nanticoke.

[5] Reservoir Creek was entered into the Geographic Names Information System on August 1, 1989.