Davis Run is a tributary of Catawissa Creek in Schuylkill County, Pennsylvania, in the United States.

The stream is considered to be a High-Quality Coldwater Fishery and Class A Wild Trout Waters.

It flows north for several tenths of a mile before receiving an unnamed tributary and entering a valley.

The stream then turns north-northwest and enters the Pumping Station Reservoir after a few tenths of a mile.

[1] Davis Run joins Catawissa Creek 30.56 miles (49.18 km) upstream of its mouth.

[4] The pH of Davis Run is 6.6 and the concentration of alkalinity in the stream is 4 milligrams per liter.

This value was most likely downstream of the Pumping Station Reservoir, where chemical and biological processes increase the stream's alkalinity significantly.

[1] Most of the watershed of Davis Run, including the entire length of the stream, is on rock of the Mauch Chunk Formation.

The lower reaches of the watershed, including most of the stream's length, is on Leck Kill soil.

[4] There is little agricultural activity in the watershed of Davis Run above the Pumping Station Reservoir.

[4] In 1990, the population density of the watershed of Davis Run was 20 people per square kilometer.

[4] Davis Run is considered by the Pennsylvania Department of Environmental Protection to be a High-Quality Coldwater Fishery.