Clark Fork Delta is located at the mouth of the Clark Fork River as it enters Pend Oreille Lake. Many large, forested islands are formed as Clark Fork splits into three main forks and many side channels. Old-growth cottonwoods are also present.

Ornithological Summary

This site supports more than 2,000 ducks (Redhead, Wood Duck, Common Merganser, Green-winged Teal, American Wigeon, Mallard, Common Goldeneye, Tundra Swan, Canada Goose) in spring and fall migrations. There is a Great Blue Heron rookery here, two Bald Eagle nests, as well as a high density of nesting osprey. Vaux?s swifts sometimes occur in high numbers during the summer.

Conservation Issues

Dam operations are continuing to cause loss of Delta habitat to erosion, and private land in the Delta is being subdivided and sold. Mitigation money from BPA may be available to combat these issues, and input into dam relicensing may be possible.


The site contains open water, riparian islands, marsh, old-growth cottonwood, and large grand fir.

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