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<br />V-I
<br />
<br />SECTIDN V
<br />RIVER FLDW AND WATER RIGHTS
<br />
<br />TA8LE V-1
<br />PHYSICAL CHARACTERISTICS (F THE "TRI-LAKES" RESERVOIRS
<br />
<br />Item
<br />No
<br />
<br />Subj act
<br />
<br />ChatfIeld Reservolr
<br />
<br />Bear Creek Reservolr
<br />
<br />Cherry Creek Reservolr
<br />
<br />The South Platte River from Chatfield Reservoir to Brighton is a mostly con-
<br />trolled river, though for flood control purposes the effect of the flood
<br />control reservoirs is significantly diminished below the Cherry Creek con-
<br />fluence. The flow of the river is controlled by releases from Chatfield
<br />Reservoir, Bear Creek Reservoir, and Cherry Creek Reservoir, which are
<br />referred to as the Tri-Lakes.
<br />
<br />.
<br /> General
<br />1 Locatton of dam 2 mi. S. of Denver, CO 3 ml. SW of Denver, CO 10 ml. SE of Denver, CO
<br />2 RIver and rIver mlle South Platte River Bear Creek Cherry Creek
<br /> Rl ver mlle 321 RIver mIle 8 RI ver mHe 11.4
<br />3 DraInage area (sq.ml.) 3,018 236 386
<br />4 Reservoir length (mI.) 2.0 at e~. 5430 0.5 at e~. 5558 1.5 at el. 5550
<br />5 Locat1on of damtender On 5 ita At Chatfle~d Oam At ChatfIeld Oam
<br />6 Travel tIme to Mo. RIver 2 weeks 2 weeks 2 weeks
<br />7 Max. dlscharge of record 110,000 cfs June 1965 8,600 cfs Ju~y 1896 58,000 cfs June 1965
<br />8 proj act cost $101,130,000 $61,700,000 $14,670,000
<br /> Dam and Embankment
<br />9 Top of dam - ft. MSL 5527 5689.5 5645.0
<br />10 Length of dam - ft. 13,136 5,30Q-maln 2,100 south 14,300
<br />11 HeIght of dam - ft. 147 180-maln,65 south 141
<br />12 Stream bed - ft. MSL 5,380 5,510 5,504
<br />13 Abutment formation Sandy overburden- Clay, shale. s lltstone, Sandstone, clay, snt
<br /> Dawson formatIon sandstone
<br />14 Type of fill Ro I ~ed earth Ro l Led earth Ro~Led earth
<br />15 FIll quantIty In c/y 14,650,000 11,345,000-maln 770,000 13,000,000
<br /> south
<br />16 Date of closure August 1973 Ju~y 1977 October 1948
<br />17 Date of In It I al fIll June 1979 May 1979 AprIl, 1969
<br /> SpIllway ,
<br />18 DIscharge capaclty - cfs 188,000 cfs at eL. 153,500 cfs at eL. 38,350 cfs at e~.
<br /> 5521.6 5684.5 5636.2
<br />19 Crest e~ev. - ft. MSL 5500.0 5667.0 5598.0
<br />20 WIdth - ft. 500 800 67
<br />21 Gates, number , slze type Ungated converg t ng Ungated earth channe l Ungated earth channe ~
<br /> chute
<br /> Reservolr ELev. & Area
<br />22 Maxlmum pool 5521.6 feet e~evatlon 5684.5 feet eLevatlon 5636.2 feet e~evatIon
<br /> 5,952 acres 1,237 acres 4,542 acres
<br />23 Top of flood controL pool 5500.0 feet elevatlon 5635.5 feet eLevatIon 5598.0 feet elevatlon
<br /> 4,742 acres 718 acres 2,634 acres
<br />24 Top of mu~tIpurpose poo~ 5432.0 - 1,412 acres 5558.0 - 109 acres 5550 - 852 acres
<br />25 Top of InactIve poo~ None 5528.0 - 17 acres None
<br /> storage Zones - E~evatlor.
<br /> CapacJ TY
<br />26 Surcharge 5500-5521.6 5635.5-5684.5 5598.0-5636.2
<br /> 115,703 acre-feet 47,435 acre-feet 134,470 acre-feet
<br />27 F ~ood contro 1 5432-5500.0 5558.0-5635.5 5550.0-5598.0
<br /> 204,737 acre-feet 28,831 acre-feet 79,960 acre-feet
<br />28 MultIpurpose 5385-5432 5528.0-5558.0 5504.0-5550.0
<br /> 26,661 acre-feet 1,905 acre-feet 13,960 acre-feet
<br />29 Inactlve None 5510-5528.0 None
<br /> 74 acre-feet
<br />30 Gross (Top of flood 235,000 acre-feet 30,810 acre-feet 93,920 acre-feet
<br /> contro 1 poo L )
<br /> Out let Works
<br />34 DIscharge capaclty 8400 cfs at e~. 5500.0 2160 cfs at e~. 5667 8100 cfs at el. 5598.0
<br />
<br />Tri-Lakes Projects
<br />These three reservoirs were built and operated by the U.S. Army Corps of
<br />Engineers. Table V-I presents a summary of the physical characteristics of
<br />each of the Tri-Lakes. Federal personnel operate the outlet works on each
<br />of the reservoirs. Representatives of the Colorado State Engineer provide
<br />direction to the federal gate keepers for storage in and releases from the
<br />reservoirs when the pool level is below elevation 5432 and/or during periOdS
<br />of low and normal stream flow. By the terms of an agreement dated April 3,
<br />1979 between the State of Colorado and the City and County of Denver, the
<br />Denver Water Department has authority over releases from Chatfield Reservoir
<br />within a nine-foot increment of storage level. When reservoir levels exceed
<br />preset limits normally due to higher rates of runoff, decisions for release
<br />rates are made by the federal personnel as a flood control function. How-
<br />ever, state personnel are advised. Normally, they attempt to regulate
<br />releases so that the flow of the South Platte in rural Adams County at the
<br />Henderson gage near Thornton does not exceed 5,000 cfs. It is near that
<br />flow rate that flooding commences. Releases from the reservoirs and control
<br />of the river involves federal/state/local government in the Chatfield Reser-
<br />voir, and federal/state government for the other two Tri-Lakes Projects.
<br />
<br />For each of the reservoirs, releases are controlled by federal and state
<br />personnel. In the case of Chatfield Reservoir, the Denver Water Department
<br />controls the releases and storage within a vertical nine-foot increment of
<br />water level. Table V-2 summarizes the agency controls for each of the three
<br />reservoirs.
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