It is estimated by many irrigation experts that one acre foot of water is sufficient to irrigate one acre of land, but the Kimball project is not dependent upon this calculation because it is the first and only reservoir filling on the creek and its water appropriation entitles it to approximately 9.000 acre-feet of water during the year, which can be obtained by refilling from the stream as the water is used during the growing season. The Oliver Reservoir is the name given this huge storage basin. The extreme height across the channel of the creek is fifty feet, and the entire distance across the channel, which is three hundred feet, is driven with sheet piling down to bedrock or hardpan. The inside slope of the dam is faced with five inches of reinforced concrete with two and one-half feet of concrete opening. The conduit or outlet works is also built of concrete reinforced with steel bars. A rocky ledge on the south side of the reservoir furnishes a natural spillway of ample capacity to take care of the situation in the event the reservoir should be filled to overflowing, providing the necessary outlet for this surplus so that none of this water can go over the dam.

A second reservoir site is owned by the district, which is located on the same creek six miles west of the < diver Reservoir. It has been surveyed and estimates of construction cost made, so that construction can begin whenever the people of the district so desire and more land is petitioned to be included within the irrigation district.