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8 .\ Grey Mountain !lam and Reservoir The active capacity of Grey Mountain Reservoir woUld be 200,000 acre-feet and its inactive capacity 20,000 acre-feet. The.maximum water surface elevation would be 5,626 feet, and the top of the dead storage wOUld be elevation 5,424 feet. The surface area of the dead storage poo~ would be 380 acres. The surface area when the reservoir is full would be 1,800 a.cres. The dam. would be an earth and rock-fill structure with the upstream face riprapped. Its height above stream bed would be about 375 feet, and the crest length would be 1,550 feet. A concrete-lined chute spillway with a capacity of 90,000 cfs, a gated inlet, and a stilling basin would originate in a sadd1.e just left of the left abutment. The outlet works would consist of a. tunnel, gate chamber, gates, steel pipe and vaJ.ve house and would have a. oapacity of 4,000 cfs. The tunnel, which is through the left abutment, would also serve as a diversion tunnel. . Irrigation releases to the North Poudre Supply Canal would be made by modifying ~el No.2, an existing structure leading eastwa.rd to the plains from the reservoir area. The municipal waterworks of Fort Collins at an estimated cost of $1,755,000 would be relocated along the south side of the river below the dam. Existing telephone and REA power lines would be relocated near the state Highway No. 14 relocation, south of the reservoir. Transmission Lines and Substations The Cache la Poudre Powerplant is to be the center of power operations. A power line leading to the Cache la Poudre switchyard from Idy1.wilde switchyard would, therefore, be required. This 115 K.V Idylwilde line would be 22 miles in length. Five ll5 KV Jines each 13 miles in length would be required from the Cache la Poudre Powerplant Switchyard to a substation near Fort Collins, Colorado. From this substation two ll5 KV 1.ines, each having a length of 31 miles, would be required to tie into the existing substation at the edge of Greeley, Colorado. Some additions would be required at the Fort Collins Substation. Communication Equipment Idylwilde Powerplant would be operated by remote control from the Cache la POudre Powerplant. Oarrier current equipment at both powerplants and a telsmetering circuit wou1.d be used to start, synchronize and control the generators at Idylwilde Powerplant. .