The Lewis River Hydroelectric Projects - PacifiCorp

Lewis River Interpretive & Education Plan
Prominent Mammal
Species of the Project Area
Elk (Cervus elaphus)
black-tailed deer (Odocoileus hemionus)
black bear (Ursus americanus)
mountain lion (Felis concolor)
bobcat (Lynx rufus)
coyote (Canis latrans)
otter (Lontra canadensis)
mink (Mustela vison)
beaver (Castor canadensis)
Douglas’ squirrel (Tamiasciurus hudsonianus)
deer mouse (Peromyscus keeni)
Prominent Fish Species
of the Project Area
Chinook Salmon (Oncorhynchus tschawytscha)
Coho Salmon (Oncorhynchus kisutch)
Chum Salmon (Oncorhynchus keta)
Steelhead (Oncorhynchus mykiss)
Cutthroat Trout (Oncorhynchus clarkii)
Kokanee (Oncorhynchus nerka)*
Bull Trout (Salvelinus conflentus)
Largescale Sucker(Catostomus macrocheilus)
Mountain Whitefish (Prosopium williamsoni)
Northern Pikeminnow(Ptycocheilus oregonensis)
Tiger Muskellunge (Esox lucius X Esox masquinongy)*
Threespine Stickleback (Gasterosteus aculeatus)
Sculpins (Cottus spp.)
* introduced
Flood Management
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, high
water and flooding are a part of natural river cycles of flow. Winter (November
through April) is the time of highest runoff, with frequent rains, and rain-onsnow
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 all floods.
Sea Reach Ltd • 146 NE yamhill Street • Sheridan, OR draft 3 • November 2008 • page 85