The watershed of Davis Run has an area of 2.86 square miles (7.4 km²).
Much of the watershed is in East Union Township.
However, a significant portion of the watershed is in Mahanoy Township.
The northern and extreme southeastern parts of the watershed are in East Union Township and the southern part of the watershed is in Mahanoy Township.
The stream is in the United States Geological Survey quadrangle of Shenandoah.

There is little agricultural activity in the watershed of Davis Run above the Pumping Station Reservoir.
The geology of the watershed upstream of the reservoir is not fertile.
Nearly all of the watershed consists of forested land.
6 percent of the stream's length is within 100 metres (330 ft) of a road and 31 percent is within 300 metres (980 ft) of a road.
48 percent of its length is within 500 metres (1,600 ft) of a road.

A reservoir known as the Pumping Station Reservoir is situated on Davis Run.
The stream also has a dam known as the Pumping Station Dam.

In 1990, the population density of the watershed of Davis Run was 20 people per square kilometer.
The watershed of Davis Run has an area of 2.86 square miles (7.4 km²). Much of the watershed is in East Union Township. However, a significant portion of the watershed is in Mahanoy Township. The northern and extreme southeastern parts of the watershed are in East Union Township and the southern part of the watershed is in Mahanoy Township. The stream is in the United States Geological Survey quadrangle of Shenandoah.
There is little agricultural activity in the watershed of Davis Run above the Pumping Station Reservoir. The geology of the watershed upstream of the reservoir is not fertile. Nearly all of the watershed consists of forested land. 6 percent of the stream's length is within 100 metres (330 ft) of a road and 31 percent is within 300 metres (980 ft) of a road. 48 percent of its length is within 500 metres (1,600 ft) of a road.
A reservoir known as the Pumping Station Reservoir is situated on Davis Run. The stream also has a dam known as the Pumping Station Dam.
In 1990, the population density of the watershed of Davis Run was 20 people per square kilometer.
Davis Run