In 1917, Powell served as athletic director at Camp Sherman. From 1917 to 1919, he served as head coach of the Naval Training Station in Charleston, South Carolina.[4]
Powell coached one season at the Montana College of Agriculture and Mechanic Arts—now known as Montana State University, from 1919 to 1920, where his football record was 1–3–1 and his basketball record was a perfect 13–0.[5] From 1920 to 1921, Powell coached Stanford University's football and basketball teams, where he compiled a football record of 4–3 and a basketball record of 15–3.[5]