To create this reservoir, John S. Eastwood was hired in 1908 to construct a dam at Long Meadow. Eastwood proposed constructing the world's first reinforced concrete multiple arch dam. Although unprecedented, at a cost of approximately $46,000, the dam's design was a less expensive alternative to a conventional rock fill dam that would have cost about twice as much to construct. The dam was completed in only 114 days, by the end of 1909, along with a mill immediately adjacent to the dam. Logs were dumped into the reservoir by rail and floated to the dam where they were drawn up into the mill, cut and then dried in kilns next to the mill on the west bank of Tenmile Creek. From this location, lumber was floated to Sanger, California, in a flume filled with water from the reservoir. The flume was the longest ever created, eventually stretching from Hume Lake to Sanger. Designed and built by James Carroll Goss, the flume was used by both the lumber company and tourists. Thrill seeking tourists would occasionally ride in the flume down from the Sierras in special boats designed with an open prow so that water would help keep the boats from flying off into the air. The flume was also reputedly utilized by the murderous bandits Chris Evans, and the Sontag Brothers (John Sontag and George Contant), who hid along the flume to evade capture.