From email from Reclamation (Kara Lamb):
We have passed the half-way mark in our annual maintenance across the Colorado-Big Thompson Project. There are roughly four weeks left.
This afternoon, we started running water through the Alva B. Adams Tunnel for some power generation on the upper portion of the project. As a result, Lake Estes is anticipated to rise a couple feet in water level elevation. It will begin a more typical pattern of water level fluctuation by Friday.
At 10:00 p.m. on Thursday, November 11, we will begin increasing releases from Lake Estes through Olympus Dam to the Big Thompson River. The first release will increase by 100 cfs, bringing the river below the dam to about 140 cfs. At 11:00 p.m., we will increase by about 150 cfs, putting 300 cfs in the river below the dam. We will increase by about 90 cfs around midnight, putting the river at about 440 cfs. We anticipate that releases to the Big T will range between 390-440 cfs for the next couple of weeks, possibly longer. The duration of the release through Olympus Dam, and the rate of flow, are largely dependent on freezing temperatures.
Water released to the river will be recaptured at the Dille Diversion near the mouth of the Big Thompson Canyon. From there it will run, via the Charles Hansen Feeder Canal, to Horsetooth Reservoir. Currently, Horsetooth is at an elevation of about 5378. It should start rising again by Friday afternoon.
Meanwhile, flows to the southern power arm of the system will remain on hold. Annual maintenance continues at the Pole Hill Power Plant, in the Bald Mountain Pressure Tunnel, at the Flatiron Power Plant, and along portions of the Charles Hansen Feeder Canal south of the Big Thompson Canyon. As a result, both Pinewood and Flatiron reservoirs remain drawn down to dead storage. We anticipate both reservoirs will start refilling in mid-to-late-December.
For the last week, Carter Lake has maintained an elevation around 5682 feet. However, it will likely drop more before the middle of next month. It is anticipated we will begin pumping water to Carter in late December.
More Colorado-Big Thompson Project coverage here.
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