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.~. ~ " Arkansas River- The Arkansas River originates in Lake County approximately 2 miles northwest of Leadville, Colorado, at the confluence of Tennessee Creek and the East Fork Arkansas River. The headwater areas of the Arkansas River are located in the San Isabel National Forest in northern Lake County at elevations in excess of 14,000 feet. The river flows southerly from its origin through the study area to Salida, Colorado, and then easterly to the plains of eastern Colorado. The study area of the Arkansas River is shown on the,basin map located in the appendix of this report (Figure 6). Tributaries to the Arkansas River in the study area include Box Creek, Halfmoon Creek, Lake Fork Creek, and numerous small tributaries. Major transmountain diversion structures in the Arkansas River Basin as a part of the Arkansas-Fryingpan Project (Refer to description in Appendix of this report) include the Charles Boustead Tunnel and Homestate Tunnel. These structures transfer water from the western s lope to Turquoise Lake, the only maj or reservoir in the upper Arkansas River Basin. ffeo.~"'.'" r The j,jlOssie:r Pass Tunnel, Columbine Ditch, Ewing Ditch, Wurtz Ditch and the Bush-Ivanhoe Conduit (Old Carlton Tunnel) are other transmountain diversions into the Arkansas River Basin as part of the Arkansas-Fryingpan Project. Evans Gulch Evans Gulch, a watershed for the Parkville Water District, originates in western Lake County high in the San Isabel Forest. The headwaters are located primarily on the western slope of Evans Peak, at elevations greater than 13,500 feet. Evans Gulch flows in a westerly direction to its confluence with the East Fork Arkansas River approximately one mile north of Leadville, Colorado. The drainage basin is shown on Figure 10. The now extinct town of Evansville was located on the south bank, just downstream of the confluence with Lincoln Gulch. In 1881, only six buildings were shown in the U.S.G.S. Atlas of the Leadville Mining District. The reach of Evans downstream limit at extends approximately mined. Gulch studied in this report has its the spillway of Big Evans Reservoir and 1.6 miles upstream. The basin is heavily Hydrologic Analyses Peak discharges for floods of the 10-, 50-, 100-, and sOO-year recurrence intervals were computed for Lake Creek, Evans Gulch and the Arkansas River in Lake County, Colorado. Due to the high altitudes of the Lake Creek and Arkansas River watersheds -3- 2'S ~o ~hn-d ~ rJL ,q,.... 'f; 11 ~ 1'1 11J, ~ & u~~,. ~ e~v;!/~ ~~ (pA.M1!~