 From its headwaters, East Fork Dairy Creek flows south for less than through Columbia County before entering Washington County from its confluence with the west fork.Over its next , it receives Campbell Creek and Roundy Creek, both from the right, Panther Creek and Rock Creek, both from the left, Denny Creek from the right, Plentywater Creek and Meadow Brook Creek, both from the left, and Murtaugh Creek and Big Canyon, both from the right.At from the confluence, the stream passes United States Geological Survey (USGS) gauge 14205400.