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<br />Greeley and Loveland Irrigation Company - Boyd Lake Spillway <br />November 19-21, 2003 <br /> <br />Agenda Item 8d <br /> <br />Water Project Construction Loan Program-Project Data <br /> <br />Borrower: Greeley and Loveland Irrigation Co. County: Larimer <br /> <br />Project Name: Boyd Lake Spillway Project Type: Spillway Reconstruction <br /> <br />Drainage Basin: South Platte Water Source: Big Thompson River <br /> <br />Total Project Cost: $3,160,000 Funding Sources: CWCB, GLlC <br /> <br />Type of Borrower: Agricultural/Municipal Aver. Delivery: 37,812 acre-feet <br /> <br />eWCB Small Project Loan: $2,844,000 <br /> <br />Interest Rate: 3.00% <br /> <br />Term: 30 years <br /> <br />The Greeley and Loveland Irrigation Company (GLlC), and its sister company the Seven Lakes <br />Irrigation Company (SLlC), own and operate a system of reservoirs and canals in the Loveland and <br />Greeley area, with about 52% of water in municipal use and 48% agricultural. GLlC owns Boyd <br />Lake which has a surface area of 1,750 acres, capacity of 48,874 acre-feet, height of 40 feet and <br />crest length of 10,729 feet. The dam is a Class 1 embankment dam. Previous studies identified <br />possible need for improvements to the Boyd Lake spillway, and possibly the Horseshoe Lake <br />spillway, as both reservoirs basically operate together as a system. The current spillway is a natural <br />swale, located near the pump house in the east side of the dam embankment, with an approximate <br />spillway width of 20 feet. It is abandoned and is no longer operable or capable of conveying any <br />storm flows. The SED requires that Class I dams contain spillways capable of safely passing 75% <br />of the Probable Maximum Precipitation (PMP) storm event. Even if operable, the existing spillway <br />could only safely pass approximately 16% of the PMP event. The GLlC is applying for a $2,844,000 <br />Small Project Loan to provide a new spillway for Boyd Lake. Site-specific PMP studies have shown <br />a need for spillway improvements on Boyd Lake only. The selected alternative consists of a <br />combination of labyrinth spillway with a width of about 1,100 feet and an effective weir length of <br />5,720 feet; replacing 1,100 feet of canal lining downstream of the spillway; and constructing a 350 <br />long floodwall to prevent water from entering into two structures during flood events. <br /> <br />rprl~1S7] -. r . --~ -r'?--'~ ~- I <br />V t I ~ ~ I <br />'"1 / J,,-______ If ~ ~~~ <br /> <br />fi- ~ ~ <br /> <br />" \ ~/ <br />* I """\" <br />; I I, li! _~ " ,,!! EXIT <br />I - - - - - "":""'-Q) f 259 CROSSROADS BLVD <br /> <br />1.-" 'f i <br /> <br />If I ~ ')S::: - <br />[!: '., ,.,,\ :J ' <br />"'\ '. : j <br />~Jrries ; rt . a ~ <br />)( \\\.1 ,........rafiJ( <br />/ I / r, <br />--....\, i <br />-~~ r~ :iSt <br />34 ___ <br /> <br />- ~ t BorY'les --- ~_,;,,;' <br />8' '" -, - <br />-"'\ 1,.J -, 0 . Dikh <br /> <br />~- <br />WIT 1rrT. <br /> <br /> <br />Q <br />"'- <br /> <br />Oklahom A.; <br />R~rvoi V' - <br /> <br />Q <br />'" <br />o <br />~ <br /> <br />Location Map <br /> <br />Page 7 of 7 <br />