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East Portal Reservoir (no Structure ID) <br />Located at the eastern terminus of the Adams Tunnel, this reservoir holds water briefly before it <br />drops 209 feet in elevation to Mary's Lake. The rockfill dam helps regulate flows coming <br />through the Adams Tunnel. Water is transported through the Ram's Horn Tunnel before entering <br />the Mary's Lake Power Plant. There are no HydroBase data available related to East Portal <br />Reservoir. Operating data related to East Portal Reservoir and other C-BT Project structures <br />involved with power generation may be available from Reclamation. This data source has not <br />been investigated as part of this effort. <br />Mary's Lake (no Structure ID) <br />This small reservoir (927 ac-ft capacity, 42 surface acres) serves as the afterbay for the Mary's <br />Lake Power Plant and is used to regulate flows to the Estes Power Plant through the Prospect <br />Mountain Tunnel. There are no HydroBase data available related to Mary's Lake. <br />Lake Estes (Structure ID 0404128) <br />Completed in 1949, Lake Estes wasn't part of the original C-BT Proj ect plan. Reclamation <br />decided a dam on the Big Thompson River would be necessary to re-regulate a controlled rate of <br />outflow for its Foothills Power System, which originally relied on generating power from Big <br />Thompson River native supplies The 3,100 ac-ft Lake Estes (185 surface acres) captures the <br />Estes Power Plant discharges and inflows coming from the Big Thompson River. Lake Estes <br />regulates river flows below the dam and releases of water to the Foothills Power System via the <br />Olympus Tunnel. The Estes Power Plant has three hydroelectric units with a total installed <br />capacity of 45 megawatts. The combined flow capacity for the three units is 1,300 cfs. There are <br />no HydroBase data available related to Lake Estes. <br />Foothills Power System <br />Natural inflows into Lake Estes, in excess of the minimum outflow required to the Big <br />Thompson River below Olympus Dam for use by downstream diverters, are diverted through the <br />Olympus Tunnel into the Foothills Power System. Water diverted is used for power generation at <br />the Pole Hill, Flatiron and the Big Thompson Power Plants, and eventually returned to the river <br />below the Big Thompson Canyon. <br />Dille Tunnel (Structure ID 0400540) <br />Water diverted through this tunnel serves two purposes; 1) it can supply the City of Loveland <br />and other users with their priority water from the Big Thompson River, and 2) it can also be used <br />to "skim" water and pass it through the Big Thompson Power Plant to generate electricity. Skim <br />water is returned to the river at the trifurcation structure at the junction of the Charles Hansen <br />Feeder Canal and Big Thompson Canyon. HydroBase diversion data have been maintained for <br />Dille Tunnel since 1993 (about 2,800 ac-ft/yr, on average). Additional data related to the Dille <br />Tunnel operations may be available from Reclamation. <br />Pinewood Reservoir (no Structure ID) <br />Constructed between 1951 and 1952, Pinewood Reservoir serves as the forebay for the Flatiron <br />Power Plant and provides regulating storage for daily peaking power at the plant. At capacity it <br />stores 2,181 ac-ft and covers 97 surface acres. Water is delivered to the Flatiron Power Plant <br />9of17 <br />