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Due to the high stream flows of 1980, 1983 and 1984, these deflector dikes were badly eroded because no stone was placed on the upstream face during their initial construction. The Division on wildlife repaired and placed rip-rap (stone) on the two right-side (Southside) dikes in 1984, The three left-side dikes are in bad condition and in need of much repair. If immediate repairs are not undertaken, the structures will be completely lost during the next flood on the South platte River. Location Of Tieback Levee . Throughout the study reach, sections of the overbank. areas have levee protection. These levees were constructed by landowners. The right bank levee is located along the southern boundary of the Tamarack Wildlife Area. The left bank levee starts at Highway No, 55 and extends upstream a distance of 1.3 miles traversing the North quarter-section line of the S 1/2 Section No. 15; T 10 N; R 49 Wand the North high bank of the South Platte River in the SE 1/4 Section No. 16; T 10 N; R 49 W. The left_bank elevation varies from a 10- year to a 100- year flood protection level. To make the left-bank more functional, a tieback levee needs to be constructed starting at the westerly point of the existing levee system; thence, traversing northerly to the UPRR (See plate 4 and exibits 2 & 3). Ground Water Problems Town of Crook and the irrigated agricultural area located North of the South Platte River have been experiencing high groundwater problems over recent years. This condition has resulted in many acres of irrigated farmlands becoming alkaline and the sewer main in Crook becoming infiltrated with foreign sub-surface waters. This investigation did not study these water-related problem. However, by confining the floodwaters within a levee system, the stream channel will clean itself and should prevent any further aggradation of the streambed through the study reach. Channel Sedimentaion . Sediment build-up is becoming a major problem for the lower :. -7-