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'- . CHAPl'ER VII MISSOURI HEIGHTS ENLARGEMENT PLAN the reservoir from Cattle Creek through the existing Mountain Meadow Ditch which presently serves the reservoir and which has adequate capacity to handle the increased water supply. The landis Canal would be constructed to convey water from the reservoir and would run generally northwesterly across Missouri Heights back towards Cattle Creek. No new irrigation lat- erals nor drains would be constructed. On the recommendation of the Bu- reau of Outdoor Recreation, not more than minimum recreational-type facil- ities for public health and safety would be provided at Missouri Heights Reservoir. The project would have little effect on fish and wildlife. Features of the plan are shown on the map on the following page. Pro,iect lands Approximately 3,140 acres of supplemental service land under the lan- dis Canal would be served by the project. It has been assumed that this acreage would include about 1,410 acres of class 2 land and 1,730 acres of class 3 land. The water for outdoor residential use, however, would not be restricted to the irrigable land but could be sold to any tract of 5 acres or less. . Water Supply Use of project water It is anticipated that initially 2,500 acre-feet of the project sup- ply would be provided for irrigation and the remaining 1,000 acre-feet for outdoor residential use. As the population increases, however, some of the irrigation supply is expected to be shifted gradually to outdoor residential use. The rate at which water would be converted in use can- not now be determined but estimates have been made for the project stud- ies as shown in the table on page 56. Water requirements Diversion requirements for project lands are estimated at an aver- age of 10,000 acre-feet annually. Approximately 6,000 acre-feet of this amount is presently available. With the additional 3,500 acre-feet pro- vided by the project, the total water supply available would amount to about 95 percent of the requirements on an average annual basis. With the project in operation over the 1964-70 period shortages would have oc- curred in the extremely dry years of 1952 to 1960 and annual shortages would have ranged from 10 to 18 percent of the requirements. Stream depletion . The flows of the Colorado River would be depleted by an average of 1,800 acre-feet annually. Salinity concentrations of the Colorado River 54