At Waiilatpu, the first flour mill was little more than an oversized metal coffee grinder powered by a small channel diverted from the river. A second mill used 24' millstones enclosed in a small building, but a fire destroyed it. Whitman's third and last mill at this site turned 40" stones, but the walls, roof, and granary were never completed. The restored millpond at the left powered the mill and fed the mission's irrigation ditches.