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<br />I <br />I' <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />combination of Boro11ic Camborthids, which are primarily clayey type soils vary- <br />ing in porportions with Aridic Aridicargiboro11s which are more loamey type soils. <br />Both of these general classifications are found in the Valley lands and typically <br />lie on fairly flat slopes within the 6,590 feet elevation range. Average annual <br />precipitation is between 15 and 20 inches. Generally the soil moisture is acidic <br />and the average annual soil temperature is less than 47 degrees Fahrenheit. The <br />Valley lands are moderately deep, well drained soils lying on the residual sedi- <br />mentary rocks. Typically, there is a thin, dark colored, loamy surface layer <br />varying from 7 to 36 inches deep followed by a lighter colored cloy material under- <br />lying the top soil. Sub-strata is fractured bed rock and gravel. Effective rooting c <br />depth is between 20 and 40 inches. Available water capacity is moderate to high. <br />Surface run-off is rapid and errosion hazard is high when the slope exceeds approx- <br />imately 10%. From the standpoint of agriculture, these soils when irrigated are ex- <br />ceptionally fertile and produce abundant crops of almost any vegetation suited to <br />the climatic conditions. Typically, the Hayden Valley supports a large hay crop <br />consisting pr'imori1y of various kinds of clover, typically red clover and a1sike <br />clover, orchard grass and timothy. Alfalfa also does well, but the principal grow- <br />ing areas for alfalfa lie on the mesas and higher elevations outside the irrigated <br />valley lands. The principal agricultural restriction is the high water table due to <br />the extensive use of irrigation. <br />When the ditches are shut off in the fall, the water table then drops to <br />a depth of 6 to 8 feet and remains there until the next succeeding irrigation' <br />season. Frost levels generally are approximately 3 feet from ground surface ~nd <br />water mains and other facilities laid at a depth of 5 feet commonly are immune, <br />from freezing. <br />It should be mentioned here, that since this report covers only the mu- <br />nicipal water supply and distribution features for the Town of Hayden, no land <br />classification )rogram concerning the agriculture capacity of the soils has been <br />--- <br /> <br />-9- <br />