+---------------------------------------+--------------------------+ | | Square miles-- | | Tracts. +------------+-------------+ | | Cultivated | Cultivable. | | | in 1877. | | +---------------------------------------+------------+-------------+ |Kamas Prairie | 4.0 | 10.0 | |Hailstone Ranche and vicinity | 2.0 | 2.0 | |Provo Valley | 6.0 | 16.0 | |Waldsburg | 2.0 | 2.0 | |Utah Valley | 59.0 | 190.0 | |Goshen } | | | |Mona } Salt Creek | 14.0 | 16.0 | |Nephi } | | | |Salt Lake Valley | | | | (including Bountiful and Centerville) | 89.8 | 192.0 | |Tooele Valley | 5.4 | 45.0 | | +------------+-------------+ | Total | 182.2 | 473.0 | +---------------------------------------+------------+-------------+ The drainage district has an area of 4,010 miles; 4¹⁄₂ per cent. are cultivated, and 11³⁄₄ per cent. may be cultivated. It will be observed that in these estimates the available water above Utah Lake is regarded as insufficient for the available land, while below the lake there is a superabundance of water, and yet the lower stream is only a continuation of the upper streams. The difference arises from the function of the lake as a reservoir. Below the reservoir the whole of the annual supply can be controlled, but above it I have assumed that irrigation will merely make use for the irrigating season of the quantity which flows at the critical period. If artificial reservoirs can be constructed so as to store water for use in Utah Valley, a greater area can be cultivated. With adequate storage facilities the streams tributary to the lake can irrigate in Kamas Prairie 28 miles; in Provo Valley and vicinity 40 miles; in Thistle Valley 6 miles; on Salt Creek 16 miles, and in Utah Valley 225 miles, making a total of 315 miles; and there will still escape to the Jordan enough water to serve all the land assigned to that stream. If such storage is practicable, the estimate tabulated above should show 552 instead of 473 miles of cultivable land. The region most likely to afford storage facilities lies in the mountains where the waters rise. I did not visit it, and until it has been examined I shall not venture to increase the estimate. The following table gives a summary for the Great Salt Lake river system: