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f , . -I!!!!!!!!I -- ------- - - - - -- ~- TABLE 1 COMPARISON OF ALTERNATIVES BY ENVIRONMENTAL RESOURCE Hydrology Hydrology of Pawnee Creek would not be affected. Flooding in Sterling, Atwood, and agricultural lands In Logan County would continue. Water Quality Water quality of Pawnee Creek and the South Platte River would not be affected. Wetlands No wetlands would be affected. Threatened and Endangered Species No federally listed threatened or endangered species would be affected. No state listed or species of concern would be affected. CIl ~ !i '" g A Highway 6 and UPRR bridges would be able to pass the 1 DO-year flood event. Pawnee Creek flood flows at Riverside Cemetery would be routed to the South Platte River without entering Sterling. Flood elevations would be reduced 3 to 6 feet at Atwood. Flood duration on agricultural lands and in Atwood would be reduced from 45 to 20 hours. Contractor would be required to use sediment control procedures to reduce the amount of sediment entering Pawnee Creek and the South Platte River. Effects on water quality would be minor and short term. Approximately, 0.1 acre of artificial wetlands adjacent to Pawnee Creek would be affected. Based on information supplied by the USFWS, three federally endangered species, one federally threatened species, and two federal candidate species have the potential to occur in Logan County. Habitats utilized by these species would not be adversely affected. Eleven state listed or special concern species have the potential to occur in Logan County. None of these species would be adversely affected. Pawnee Creek flood flows at Riverside Cemetery would be routed to the South Platte River without entering Sterling. Contractor would be required to use sediment control procedures to reduce the amount of sediment entering Pawnee Creek and the South Platte River. Effects on water quality would be minor and short term. No weiland areas would be affected. Based on Information supplied by the USFWS, three federally endangered species, one federally threatened species, and two federal candidate species have the potential to occur in Logan County. Habitats utilized by these species would not be adversely affected. Eleven state listed or special concern species have the potential to occur In Logan County. None of these species would be adversely affected.