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PSMBP, Kortes Unit <br />ENGINEERING DATA <br />penstocks sloping through dam to <br />Water Supply <br />powerhouse, each controlled by one 96 -in <br />NORTH PLATTE RIVER <br />Foundation: Relatively fresh, unweathered, <br />( See Kendrick Project for streamflow data.) <br />high - quality granite, complexly fractured, <br />Storage Facilities <br />in many of which the granite has altered to <br />KORTEs DAM <br />clay. <br />Type: Concrete gravity <br />curtain under upstream toe of dam. <br />Location: On the North Platte River 60 mi <br />Mass concrete: Natural aggregate from deposit <br />southwest of Casper, Wyo. <br />II (low alkali) cement; temperature control <br />Construction period: 1946 -51 <br />by circulating river water through embed- <br />Date of closure (first storage): February 6, <br />Volume . ............................... <br />1950 <br />Maximum size aggregate .................. <br />6.5 in <br />Reservoir, Kortes: <br />Exterior concrete ........................ <br />Average annual inflow: Releases from Seminoe <br />Interior concrete ......................... <br />0.60 <br />Reservoir. <br />Exterior concrete ........................ <br />Total capacity to El. 6142 ................. <br />4,760 <br />acre -ft <br />Active capacity .......................... <br />4,600 <br />acre -ft <br />Surface area ............................. <br />83 <br />acres <br />Dimensions: <br />Structural height ......................... <br />244 <br />ft <br />Hydraulic height ......................... <br />200 <br />ft <br />Crest width ............................. <br />24 <br />ft <br />Maximum base width ..................... <br />193 <br />ft <br />Crest length ............................. <br />440 <br />ft <br />Crest elevation .......................... <br />6169.0 <br />ft <br />Total volume ............................ <br />147,000 <br />yd' <br />Spillway: Uncontrolled concrete crest and <br />concrete -lined tunnel in right abutment. <br />Crest length ............................. <br />118 <br />ft <br />Crest elevation .......................... <br />6142.0 <br />ft <br />Capacity at El. 6165.7 .................... <br />50,000 <br />ft' /s <br />Outlet works: Three 108 -in- diameter steel <br />penstocks sloping through dam to <br />powerhouse, each controlled by one 96 -in <br />ring - follower gate. <br />Foundation: Relatively fresh, unweathered, <br />high - quality granite, complexly fractured, <br />with prominent sheeted and jointed zones, <br />in many of which the granite has altered to <br />clay. <br />Special treatment: Cement grout blanket and <br />curtain under upstream toe of dam. <br />Mass concrete: Natural aggregate from deposit <br />4 mi downstream; oversize crushed. Type <br />II (low alkali) cement; temperature control <br />by circulating river water through embed- <br />ded pipe system below El. 6065. <br />Volume . ............................... <br />147,000 yd' <br />Maximum size aggregate .................. <br />6.5 in <br />Average net water- cement ratio (by weight): <br />Exterior concrete ........................ <br />0.52 <br />Interior concrete ......................... <br />0.60 <br />Cement content: <br />Exterior concrete ........................ <br />0.91 bbl /yd' <br />Interior concrete ......................... <br />0.81 bbl /yd' <br />Contraction joints: Transverse joints 64 ft <br />apart, grouted after cooling. <br />Power Facilities <br />KORTES POWERPLANT <br />Location: Kortes Dam <br />Year of initial operation: 1950 <br />Year last generator placed in operation: 1951 <br />Nameplate capacity ...................... 36,000 kW <br />Number and capacity of generators ...... (3) 12,000 kW <br />Maximum head .......................... 207 ft <br />