The Lewis River Hydroelectric Projects - PacifiCorp

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PacifiCorp does not accept responsibility for the safety or well-being of recreation area guests. Images: Map of Beaver Bay Park, showing picnic sites, boat launch, parking, swimming beach, facilities. Photos of recreation. Historical photos of Joe Masters and Ole Peterson. Appendix 1: panel profiles Lewis River Draft I&E Plan page 43
Beaver Bay—Interpretive Sign #1 (Hydroelectric Story) Location: Size: Title: Main Content: Beaver Bay TBD Cycles of Flow Rivers are not steady systems. Their flow changes seasonally, and in response to weather events such as droughts and heavy rains. Here in the Cascades, floods are a part of natural river cycles of flow. Winter (November through April) is the time of highest runoff, with frequent rains, and rain-on-snow events that can cause big surges in the Lewis River’s flow. Dams are a means to regulate the flow of a river. But dams can’t change the rate at which water flows into the system, they can only regulate the water flowing out of the system. At best, dams can only dampen the natural oscillations of the river’s flow—and they cannot prevent floods. As operator of the dams of the Lewis River hydroelectric projects, PacifiCorp has the responsibility to provide flood management—not flood control—for the communities below Merwin Dam. Working out the most efficient pattern of storage, release, and drawdown to control river flow and buffer water fluctuations, while still generating electricity, requires a skillful dance of meteorology and hydrology. To do this, meteorologists study precipitation patterns and weather forecasts to create “flow forecasts” to help make decisions about water levels in the three reservoirs. Higher flows and higher energy demands prescribe higher water release rates through turbines or spillways. When a significantly higher flow is forecasted, the reservoirs may be drawn down to provide space to store the incoming water. Main Text Caption: Sidebar: As part of its flood management plan, PacifiCorp funds county agencies responsible for notifying property owners of sudden high water events. PacifiCorp also provides funds to the county for the dissemination of information about water levels in the reservoirs and flow rates at Merwin. This information is provided in several forms, including weather radio, Internet, and telephone lines with automated flow information). At midnight, just three days before Christmas of 1933, inhabitants of the Lewis River floodplain at Woodland were awakened by the roar of water as a massive flood swept down the river to Woodland. The following Sunday’s Oregonian breathlessly trumpeted news of the flood: “The usually lazy north fork of the Lewis River suddenly became a snarly, boiling demon of destruction. Rearing four feet above its banks, it thundered down the broad valley to the fertile farm land above Woodland, tossing bridges and tractors, barns, sheds and trees before it, toppling houses, tossing them on its crest, smashing them with the Appendix 1: panel profiles Lewis River Draft I&E Plan page 44
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