Built from 1963 to 1967, the dam is an earthfill and rockfill construction stretching over 3 miles (4.8 km) across the valley of San Luis Creek. A morning-glory type spillway lies at the left bank of the reservoir. At 87.5 feet (26.7 m) high, with a maximum reservoir depth of 57 feet (17 m), the crest of the dam is 14,300 feet (4,400 m) long, at an elevation of 223 feet (68 m). The spillway is, as mentioned before, a morning-glory (inverted bell) design, capacity 3,250 cubic feet (92 m3) per second, and with a circumference of 641.5 feet (195.5 m).
The O'Neill Forebay reservoir is fed by releases from the San Luis Dam as well as from the Delta–Mendota Canal. Water from the Delta–Mendota Canal is lifted a vertical distance of 8 feet (2.4 m) into a channel running 2,200 feet (670 m) into the forebay.[1] The peak inflow to the forebay is 15,600 cubic feet (440 m3) per second, from both the San Luis Dam and the Delta–Mendota Canal. Drainage area of the reservoir downstream of the San Luis Dam is only 18 acres (7.3 ha).
O'Neill Pumping-Generating Plantedit
The O'Neill Pumping-Generating Plant produces 28 megawatts (38,000 hp).[1] Irregular water releases from the San Luis Dam and William R. Gianelli Powerplant are collected in the reservoir of the O'Neill Dam, which has a capacity of 56,400 acre-feet (69,600 dam3).
Department of Water Resources (2009). "Station Meta Data: O'Neill Forebay (ONF)". California Data Exchange Center. State of California. Retrieved 2009-04-01.
^"O'Neill Powerplant". US Bureau of Reclamation / Projects & Facilities / Powerplants / O`Neill Powerplant. Retrieved 2019-10-19.
^"O'Neill Dam". US Bureau of Reclamation / Projects & Facilities / Dams / O`Neill Dam. Retrieved 2019-10-19.
April 13, 2024
neill, earthfill, luis, creek, miles, west, banos, california, united, states, eastern, slopes, pacific, coast, ranges, merced, county, forming, neill, forebay, forebay, luis, reservoir, roughly, miles, downstream, from, luis, neill, forebay, seen, from, left,. O Neill Dam is an earthfill dam on San Luis Creek 12 miles 19 km west of Los Banos California United States on the eastern slopes of the Pacific Coast Ranges of Merced County Forming the O Neill Forebay a forebay to the San Luis Reservoir it is roughly 2 5 miles 4 0 km downstream from the San Luis Dam O Neill DamO Neill Forebay and Dam as seen from left bank Official nameO Neill DamLocationMerced County California U S Coordinates37 04 50 N 121 02 50 W 37 0805 N 121 0472 W 37 0805 121 0472Construction began1963 61 years ago 1963 Opening date1967 57 years ago 1967 Operator s US Bureau of ReclamationDam and spillwaysImpoundsSan Luis CreekHeight87 5 ft 26 7 m Length14 300 ft 4 400 m Width base 124 ft 38 m ReservoirCreatesO Neill ForebayTotal capacity56 400 acre ft 69 600 dam3 Catchment area18 sq mi 47 km2 Surface area2 250 acres 910 ha U S Geological Survey Geographic Names Information System O Neill Dam Contents 1 Background 2 O Neill Forebay reservoir 3 O Neill Pumping Generating Plant 4 See also 5 Notes 6 References 7 External linksBackground editBuilt from 1963 to 1967 the dam is an earthfill and rockfill construction stretching over 3 miles 4 8 km across the valley of San Luis Creek A morning glory type spillway lies at the left bank of the reservoir At 87 5 feet 26 7 m high with a maximum reservoir depth of 57 feet 17 m the crest of the dam is 14 300 feet 4 400 m long at an elevation of 223 feet 68 m The spillway is as mentioned before a morning glory inverted bell design capacity 3 250 cubic feet 92 m3 per second and with a circumference of 641 5 feet 195 5 m O Neill Forebay reservoir editMain article O Neill Forebay The O Neill Forebay reservoir is fed by releases from the San Luis Dam as well as from the Delta Mendota Canal Water from the Delta Mendota Canal is lifted a vertical distance of 8 feet 2 4 m into a channel running 2 200 feet 670 m into the forebay 1 The peak inflow to the forebay is 15 600 cubic feet 440 m3 per second from both the San Luis Dam and the Delta Mendota Canal Drainage area of the reservoir downstream of the San Luis Dam is only 18 acres 7 3 ha O Neill Pumping Generating Plant editThe O Neill Pumping Generating Plant produces 28 megawatts 38 000 hp 1 Irregular water releases from the San Luis Dam and William R Gianelli Powerplant are collected in the reservoir of the O Neill Dam which has a capacity of 56 400 acre feet 69 600 dam3 See also edit nbsp California portal nbsp Water portal nbsp Renewable energy portal List of dams and reservoirs in CaliforniaNotes edit a b Bureau of Reclamation 2009 O Neill Dam Projects and Facilities Database U S Department of the Interior Retrieved 2009 04 28 1 2 References editDepartment of Water Resources 2009 Station Meta Data O Neill Forebay ONF California Data Exchange Center State of California Retrieved 2009 04 01 External links edit O Neill Forebay Geographic Names Information System United States Geological Survey United States Department of the Interior 19 Jan 1981 Retrieved 2009 06 15 O Neill Powerplant US Bureau of Reclamation Projects amp Facilities Powerplants O Neill Powerplant Retrieved 2019 10 19 O Neill Dam US Bureau of Reclamation Projects amp Facilities Dams O Neill Dam Retrieved 2019 10 19 Retrieved from https en wikipedia org w index php title O 27Neill Dam amp oldid 1195042940, wikipedia, wiki, book, books, library,
