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24 002262 . Plan 7 (Sierra diversion to Lake Havasu--East Side Division exchanges)--This plan proposes to divert 1,200,000 acre-feet from the major east side San Joaquin Valley streams, above about 3,000 feet elevation, by a series,of tunnels of progressively larger capacity starting at the San Joaquin River above its junction with Big Creek and intersecting the Kings, Kaweah, and Tule Rivers and discharging into Isabella Reservoir. From Isabella Reservoir, the water would be conveyed by tunnel to the east side of the Sierra Nevadas to a point about 20 miles north of M9jave. From that location it would be conveyed east and south to Lake Havasu on the Colorado River. Exchange water for the areas now being served by the east side streams, from which tunnel diversions are contemplated under this plan, would need to be prov~ded. This tunnel diversion plan would require a series of tunnels totaling 140 miles in length from San Joaquin River to Isabella Reservoir on the Kern River. Associated with these tunnels would be 11 diversion dams for diverting water from each of the streams. From Isabella Reservoir a 34-mile tunnel would convey the water southeasterly through the Sierra Nevadas to Cottonwood Creek, about 20 miles north of the town of Mojave. From this location the water would be lifed 185 fect and conveyed 316 miles through a 2,000 c.f.s. canal to Lake Havasu on the Colorado River. The avail- able head makes possible three power drops in this reach--Newberry Powerplant, 66,000 kw., 20 miles east of Barstow; Bagdad Powerplant, 140,000 kw., about 80 miles east of Barstow; and Lake Havasu Power- plant, 72,000 kw., at the terminal point on the Colorado River. The capital cost of these tunnel diversions, including facilities to convey the water to Colorado River (exclusive of exchange and storage facilities), is estimated to be $950,000,000, on a recon- naissance basis, and the annual OM&R $2,300,000, not including cost of pumping energy. The cost of pumping will be offset by power generated. The net power generated is estimated to return an annual revenue of $7,400,000. . Exchange water for the areas now served below the points of diversion on the east side streams would be conveyed through East Side Division (enlarged). A 3,000 c.f.s. incremental increase would be made in these facilities to the Kern River. The estimated reconnaissance capital cost for this ihcremental enlargement for exchange purposes is $200,000,000, including the estimated amount required to offset the adverse effect on existing powerplants below the tunnel diversions. The annual OM&R and pumping costs are estimated to approximate $5,600,000 annually. The additional water, 1,200,000 acre-feet, required for exchange purposes would be conserved in two storage reservoirs proposed on Trinity River. Helena Reservoir, with a gross storage capacity of