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Greeley and Loveland lmgation Company. Boyd Lake Spillway November 19-21, 2003 Agenda Item 8d Water Project Construction Loan Program-Project Data Borrower: Greeley and Loveland Irrigation Co. County: Larimer Project Name: Boyd Lake Spillway Project Type: Spillway Reconstruction Drainage Basin: South Platte Water Source: Big Thompson River Total Project Cost: 53.160.000 Funding Sources: CWCB, GLlC Type of Borrower: AgriculturaVMunicipal Aver. Delivery: 37,812 acre-feet CWCB Small Project Loan: $2.844.000 Interest Rate: 3.00% Term: 30 years The Greeley and Loveland Irrigation Company (GLlC), and its sister company the Seven Lakes Irrigation Company (SLlC), own and operate a system of reservoirs and canals in the Loveland and Greeley area, with about 52% of water in municipal use and 48% agricultural. GLlC owns Boyd Lake which has a surface area of 1,750 acres, capacity of 48,874 acre.feet, height of 40 feet and crest length of 10,729 feet. The dam is a Class 1 embankment dam. Previous studies identified possible need for improvements to the Boyd Lake spillway, and possibly the Horseshoe Lake spillway, as both reservoirs basically operate together as a system. The current spillway is a natural swale, located near the pump house in the east side of the dam embankment, with an approximate spillway width of 20 feet. It is abandoned and is no longer operable or capable of conveying any storm flows. The SED requires that Class I dams contain spillways capable of safely passing 75% of the Probable Maximum Precipitation (PMP) storm event. Even if operable, the existing spillway could only safely pass approximately 16% of the PMP event. The GLlC is applying for a $2,844,000 Small Project Loan to provide a new spillway for Boyd Lake. Site-specific PM? studies have shown a need for spillway improvements on Boyd Lake only, The selected alternative consists of a combination of labyrinth spillway with a width of about 1,100 feet and an effective weir length of 5,720 feet; replacing 1,100 feet of canal lining downstream of the spillway; and constructing a 350 long floodwall to prevent water from entering into two structures during flood events. 1-1: ~.- I ,'!) ~_"287 (" . I. :\ , ,~ ii I I _nun . , . . A .. :;/ , ~ ~ ~~ : ) \.. '''/'; . I: I ~____~i r I ,\O~"' I J -I! ~ , , 'I - , , : I} I ,"""'" !. I ... ~) '. : 1Jt'/ , ~ . ","",,' '- . q--J.4 ~- , , ( (~~ i1 ~ 'J S . I --. I ./ _ow . '" ..~ ... A. ~\\ ~ 0_'- R_~ . i ~~ " ""'" ~ " ,4 Project :~ ,Location~ """ -a.-.- - _ Location Map J"H~\,. n """'. .lJ