Like the Teamster's Cabin, the powder monkey's house dates to about 1870 and is typical of the picket-style construction at early Fort Supply. Many of the picket buildings were later used for fire wood, but this and the Teamster's Cabin survived that fate.
The COQ was built as a residence for the Army officer commanding Fort Supply. He and his family lived in relative comfort in the ten rooms that included a servant's room and an attached bathroom. The yard was fenced and a boardwalk passed by the front and along "Officers' Row."