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I-6 Several ditches which take their supply from the Canadian River irrigate land east of the river. They tend to be longer, larger and have more irrigated acreage than the ditches west of the river. Table I-1 also summarizes the irrigated acreage and maximum height of irrigation for these ditches. Several ditches irrigate land east of the Canadian River but take their supply from tributaries of the Canadian, including Kelly, Willow, Muddy, Cabin, Allen, McKenzie, Coon and Government Creeks. These right bank tributaries have basin areas ranging from 1,200 to 9,410 acres. The creeks all have good sources of supply because the upper reaches extend into the Medicine Bow Mountains where peak elevations reach 12,560 feet. The higher elevations allow much greater accumulations of snowpack than the tributaries on the west side of the • Canadian. Unfortunately, no stream gauge records are known to exist for these tributaries to illustrate their greater yield. Table I-2 summarizes the tributary area, upper basin elevation, the ditches served and their irrigated acreages of the right bank tributaries which support irrigation. Irrigated Acreage - Michigan River Basin There are approximately 20,800 irrigated acres supported by the Michigan River, excluding the Illinois River, its major tributary. The identified irrigation systems and their estimated irrigated areas are also shown on Plate 22, North Park Irrigation Study. The Michigan River supports more irrigated acreage because it has more suitable land and a much greater physical supply. Average monthly runoff is shown on Figure I-2, as determined from runoff records available at Walden. An adequate physical supply is available for April • through June, with reduced but usable supplies available in July. Leonard Rice Consulting Waler Engineers. Inc.