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Elk River Natural Resources Conservation Area, totaling is the largest, highest qualityestuarine system remaining inWashington orOregon. It includes diverse habitats, ranging fromtideflats and sloughs,saltmarsh and freshwaterwetlands, to foresteduplands.
Identified as critically importantwaterfowl andshorebird habitat, it also includes a nesting site forbald eagle and significant habitat forelk,bear,beaver,river otter and othermammals. One population of a Washington state monitor plant species, Henderson's checker- mallow, occurs within the tidal portion of the estuary system.
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