The Soldiers Meadow Reservoir is located on Webb Creek about 6 miles southeast of Waha and has a total storage capacity of 2,370 acre-feet (active 2,370 acre-feet). In 1986, the top 25 feet of embankment at Soldiers Meadow Reservoir was replaced and the crest was raised by 7 feet. In addition, filters were incorporated into the rebuilt embankment and the spillway and outlet works were modified. This work was accomplished under Reclamation’s Safety of Dams Program.
Soldiers Meadow Dam is situated on the northeastern edge of the Columbia Plateau, a complex structural basin, several miles deep, lying between the Idaho Batholith on the east and the Cascade Ridge on the west. The basin grades into the Basin and Range Province to the south and is bounded by the older rocks of the Northern Rocky Mountains to the north. The Columbia Basin is characterized by the great accumulation of lave flows and volcanic debris. The lava flows in aggregate are over a mile in thickness and are reported to have a volume that may be as large as 100,000 cubic miles. The basaltic lavas erupted quietly along fissures and spread for great distances from their source. Down warping and filling of the basin probably began in Eocene time, continued through Oligocene, Miocene, Pliocene and may still be in progress.