Watrous Run is a 1.00 mi (1.61 km) long first-order tributary to East Branch Tunungwant Creek.

[2] This is the only stream of this name in the United States.

[1] Watrous Run rises about 1 mile (1.6 km) northwest of Lewis Run, Pennsylvania, and then flows southeast to meet East Branch Tunungwant Creek at Lewis Run.

Watrous Run drains 0.44 square miles (1.1 km2) of area, receives about 46.4 in/year (118 cm/year) of precipitation, and is about 91.36% forested.

[3]