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OGH'lF 4. . near Greeley. There are a few wells north of the Pierce Lateral, otherwise the entire area is under gravity irrigation. Lone Tree Creek is a living stream near Dover where there is a gaging station but is dry to a point between Pierce and Ault. From here on to its confluence with the South Platte, it is a living stream but has dried up in places during drought periods. Its waters have been appropriated. . The water table reached its lowest point of record in 1956 which was only slightly lower than the low of 1941. In both these periods, many pumps were taking air. By 1944 in the first instance, water tables had recovered 5 to 10 feet. The more severe lowering of 1956 was followed in 1957, 58 and 59 by recoveries of up to 15 feet thus bringing the water table back to about the same elevation as in 1944. Ground- water use in this area has demonstrated its ability to recover promptly after several years of heavy withdrawals from storage. Its value as a means of equating water supply is very great. All this ground water is moving towards the Poudre and the South Platte and consequently there is a contribution to those streams. The deviation in discharge between high and low water tables at some distance back from the streams is not of great magnitude. The magnitude of course increases as proximity to the stream decreases. It seems reasonable to believe that a satisfactory evaluation of the distance at which the effect is immaterial can be arrived at. Mathematics of ground- water flow can be very useful in this field. Crow Creek There are a few irrigation wells in the vicinity of Hereford and Grover. Most of the wells are in the vicinity of Gill and below gravity canals. There may be a few between Gill and Grover. No information is available as to changes in the water table north of Gill. Wells in the Gill area showed a gradual lowering over a long period of time reaching its lowest stage in 1956. In the following 3 years they recovered to about normal. No interference with surface rights is involved along this creek. Beebe Draw .. " Seepage from Barr Lake and distributary ditches from it provide a small continuous flow in the draw which is captured in Milton Reservoir. There are irrigation wells scattered along its entire length and these conceivably could affect the flow in the draw. The few observation wells near Hudson indicate continuous lowering of the water table. .. - 4 -