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determined that no continuous active channel exists in this valley. Therefore, this valley does not meet the geomorphic criteria for AVF designation, and thus is not considered further in this AVF evaluation. However, the northern tributary includes an active channel (approximately three feet in width). Alluvium was mapped, and three terrace levels were found in this valley. Heights of [liese terraces above the channel are as follows: TI - 2 feet Tz - 4 feet T3-8-lOfeet The valley is quite narrow (i.e., less than 50 feet) where it comes through a canyon, immediately above the confluence with Fish Creek. Upstream the valley widens to 500 feet. Tltis tributary is considered to meet the AVF geomorphic criteria and will therefore be further evaluated in subsequent sections of this AVF evaluation. SECTION III WATER AVAILABILITY CHARACTERISTICS Flood Irrieation Fish Creek, is diverted in part for irrigation purposes (see Map 3). Of the ditches identified on Map 3, only about half a present) being used. The overall pattern of historic and currently used surface water diversions and ditches indicate relatively intensive irrigation development in the study area. (Please note that not all ditches mentioned in the following text are located on Map 3. All ditches within each drainage are mentioned to establish a historical perspective with respect to regional irrigation practices. However, only [hose ditches proximate to the study area have been located on Map 3.) Fislt Creek Fish Creek has been diverted for irrigation purposes throughout its length. Several diversions in the headwaters of the stream in the Williams Fork Mountains are still in use, including the Highland, East Side, Yoas[, and Art Long diversions (Table 1). Nearby the Fish Creek Mine, the Koll and Mager Ditches have been abandoned and reportedly have not been used in the past 10 years (Table 1, Map 1. The Corliss Ditch diverts Flow to terraces and slope wash areas south and east of Fish Creek. This ditch once extended about 3.5 miles to the intersection of Section 10, 11, 14, and I S TSN,R86W (about 60 feet above the adjacent channel of Fish Creek). Presently, the portion of the tlitch used to irrigate lands are managed for the Colorado Yampa Coal Company ranching operation, although portions of the ditch further down valley on the Perley Green Ranch are in disrepair. The Boettler Ditch diverts water from Fish Creek onto terrace land north of the stream and has irrigated land in Sections 1, 2, and 3, TSN,R86W. This ditch is in good repair and is now used to irrigate 75 acres of pastureland which is part of the Colorado Yampa Coal Company Ranclt. • I:environ\tracy\document/ExhibTA 4 01/16/98 ~pP~E~:'~'.13 .li.lA! ~ 4 2000