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Or."?'\: u l"i; l 3. Classification II. . The use of ground water in the tributary valleys will be dis- cussed in their downstream order. ., Sand Creek and First Creek Both of these creeks are live at times in some places. There are a few irrigation wells in each of these drainages. Little is known as to the possible effect pumping may have on such flows or whether surface rights might be interferred with. Tentatively I would put such use in the second classification. Box Elder Creek in District 3. " This creek becomes a living stream at a point about 3 miles south of Wellington and there are several appropriations between that point and where it empties into the Poudre. It is quite possible that wells near the stream affect its flow. If this effect could be ignored, then I would place all the area in this drainage in Classification II, beginning at some arbitrary line about 3 miles distant from the Poudre. Practically all the area is under gravity irrigation and is now assured of adequate ground-water replenishment. The water table short distances north and south of Wellington receded considerably in the period 1945-1956 and had not water supply conditions improved, this area would have become critical. The additional water supply to the North Poudre Canal system from the Big Thompson project reversed the down- ward trend in 1957. Pumping in this area should actually be beneficial in controlling the water table. Large areas presently farmed under the North Poudre Canal and some other canals could become waterlogged with the increased use of water from the Big Thompson project. Black Hollow .' There are a few wells in this valley near Severance and on south. The farms involved all receive gravity water hence there would be no threat of ground water exhaustion. I know of no surface rights that could be affected. In places, pumping could have a beneficial effect. Lone Tree ., A very large area is involved here extending from near Pierce to - 3 -