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<br />~ <br />c:> <br />'. .-, <br /> <br />N <br />~ <br /> <br />16 <br /> <br />into Fruitland Irrigation Ditch. The San Juan Power Plant <br />diversion structure is located just downstream of Fruitland. The <br />entire river passes over this structure, except at abnormally <br />high flows, when a portion of the river flows around the weir and <br />may allow upstream movement of fish. The Four Corners power <br />Plant pump station, with its associated weir, is located 3 miles <br />downstream of the concrete weir at Fruitland. The Hogback <br />diversion dam is the next major structure across the river. It <br />was passable by fish until september 1987, when it was <br />reconstructed and all flow was diverted into the Hogback Canal at <br />low flow with excess water released back to the river a short <br />distance downstream. The most downstream diversion, at CUdei, is <br />the only one below Shiprock. There are no major diversion <br />structures that would impede fish passage on the mainstem San <br />Juan River in Colorado or Utah. <br /> <br />These diversions, as well as other diversions from the San Juan <br />River and its tributaries in New Mexico, Colorado and Utah with <br />the associated return flows, result in a net depletion of the San <br />Juan River flow of up to 648,100 acre feet annually. The net <br />depletion at Bluff, Utah, is reduced to 623,100 acre feet by <br />return flow from projects that divert water from the Dolores <br />River, but return water to the San Juan River. These baseline <br />depletions and return flows are shown in Table 2.3. <br />