Work on reservoir tunnel near completion.Byline: The Register-Guard BLUE RIVER - The U.S. Army Corps of Engineers will pull the plug on Cougar cougar: see puma. cougar or puma or mountain lion or panther Species (Puma concolor) of large, graceful cat that lives in a wide variety of habitats in the Americas, from southern Alaska to Patagonia. Reservoir next week. Corps workers will remove the last of a 35 1/2 -foot concrete plug from a diversion tunnel through Cougar Dam. The work is part of a multi-year project to add a temperature control tower at the dam, 42 miles east of Eugene on the South Fork South Fork may refer to:
The McKenzie River is a tributary of the Willamette River, 86 miles (138 km) long, in northwestern Oregon in the United States. It drains part of the Cascade Range east of Eugene into the southernmost end of the Willamette Valley. . When the dam was built in the early 1960s, the tunnel was used to divert water from workers. When the dam was completed in 1963, the tunnel was plugged with about 550 cubic yards of concrete. Removing the plug, also called a lake tap, is a well-choreographed exercise in controlled blasting techniques, the corps said. More than two-thirds of the plug was removed in previous blasts by the Buena Vista, Colo., company that also installed regulating gates and lined the tunnel to strengthen it. The final blast, on a day next week still to be set, will be the most critical because it will clear the tunnel. Water behind the dam will again be diverted through the hole, for about 45 minutes, to flush sediment sediment, mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock). in the tunnel. The passage also will be used to manage flows on the river during the three-year tower construction. The new temperature equipment will help the corps regulate water temperatures in the river to help declining runs of salmon and bull trout Bull´ trout` 1. (Zool.) In England, a large salmon trout of several species, as Salmo trutta and Salmo Cambricus, which ascend rivers; - called also sea trout ltname>. . Around March 1, the corps will divert water through the tunnel until the reservoir is about 157 feet below the normal winter level. That will allow workers to begin building the water intake tower, including a new weir system on the face of the existing tower. The weir system will allow the corps to draw water from various depths and mix it to achieve temperatures expected to boost survival of migrating fish and chinook salmon chinook salmon or king salmon Prized North Pacific food and sport fish (Oncorhynchus tshawytscha) of the salmon family. The average weight is about 22 lbs (10 kg), but individuals of 50–80 lbs (22–36 kg) are not unusual. eggs downstream. Threatened salmon and bull trout have been harmed by unnatural temperatures flowing out of the reservoir and into the South Fork of the McKenzie. Water released from the bottom of the reservoir is too warm in the winter, which can cause eggs to hatch early, or too cold in the fall, which can cause returning salmon to spawn To launch another program from the current program. The child program is spawned from the parent program. (operating system) spawn - To create a child process in a multitasking operating system. E.g. too early. As a result of the drawdown Drawdown The peak to trough decline during a specific record period of an investment or fund. It is usually quoted as the percentage between the peak to the trough. Notes: , all boat ramps on the reservoir will be closed this year and the next two years. A residual pool above the dam will be maintained for fish. The corps also will collect adult bull trout, listed as a threatened species, below the dam and release them above the reservoir. The agency will add water temperature controls at Blue River Dam on Blue River as well. The total project cost is estimated at almost $70 million. |
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