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below Larimer and Weld Canal in Fon Collins, where the channel does not exist in ~vcral areas, Upstream from the AHa Vista Commumty, the Dry Creek channd is undefined except for a small drainage ditch just downstream from College Avenue, Extensive commercial and residcnlial devclopmcnt is located within the Dry Creek flood plain from College Avenue to the Larimer and Weld Canal. Downstream from the Larimer and Weld Canal, the Dry Creek channel has been obliterated from WiIlox Lane to downstream from the trailer court. In the Fort Collins Airpark area, thc disposal of building materials and other fill material in the Dry Creek channel has reduced its capacity. BOX ELDER CREEK Dry Creek has two major triblltaries, Spring Gulch and Park Creek. Spring Gulch drains into Park Creek in the upper third of the basin. Park Creek drains Into Dry Creek near the center of the basin. Flows from Dry Creck and its tributaries are interccpted by 2 major, on-stream reservoirs (Park Creck Re~rvoir and Douglas Lake). 15 off- stream reservoirs. and 7 transbasin irrigation callo.b. Boxelder Creek is a left-bank tributary of the Cache La Poudre River. It flows from north to south, beginning at its headwaters 10 southern Wyoming at an eh:vatiun of 7720 feet, m.s.!. and ending at its confluence With the Cache La Poudre River at an elevation of 4860 feet. m,s.1. Thc Boxelder Creek drainage basin covers an area of 251 square miles in Albany and Laramie Counties, Wyoming, and Larimcr and Weld Counties, Colorado. The basin is about 32 miles long and 8 miles wide. Boxelder Creek flows along the northeast edge of Fort Collins and joins the Cache La Poudre River south of Drake Road. Boxelder Creek has four tributaries. They are Sand Creek, Rawhide Creek, Indian Creck, and Cooper Slough (see figure 2-1). Approximately 176 square miles of the basin arc controlled by Soil Conservation Service's flood control dams B-2, B-4, B-5, and B-6 near Wellington, Colorado. which is about 8 miles upstream from Forr Collins. Land use in the Dry Creek basin has been primarily agricullural with the exception uf th~ Fort Collins area. Durir.g the last 40 ye:>.rs, urban dev!;'l"prnent has grown extensively in the luwer reach below U.S. Highway 287. Development has obliteratcJ the Dry Cruk channel, especially near College AI'COlle. LanJ use immeJiatcly dowll- stream from College Avenue is primarily residt:ntial, with commercial development along College Avenue, Ncar the contluence, land u>c includt:~ commercial and light industrial development. This arca is commonly referred to as the Forr Collins Airpark. Thc Boxcldcr Creek basin lies within the Colorado-Piedmont scction 01 t1w Great Plains. Thenorrhcrn porrion of the basin consists ofrol1ing plateaus, below which isan arca of hogb<lck ridgcs and narrow Illesasinterspcrsed with narrow valleys and eany"ns. East and south of thcsc ridges and me,as is an area ofrolhng plains \\'hichen~ndssl'u\h to the Cache La Poudrc River noodplalO. Most of the land use in the baslO is <Igri- cultural except for some commercial land use in the Fort Collins area. SPRlNG CREfJ<: Spring Creek, which is a right-bank tributary of the Cache La Poudre River, 110ws frnm west to east through Fort Collins. Beginning at Spring Canyon Dam and Horse- tooth Rc><:rvoir. Spring Creck flows easterly until it joins the Cache La Poudre River norttleast of the intersection of Timberline R0ad and Prosped Road, The Spring Creek hasin hal a drninage area of 30 <;quare miles. Thcupper IS square milcs of the basin is controlled by Spring and Dixon Cl\llyon Dams and Horsetooth Rcserv\,ir. which wcre 2-3 H