Misty Upham, known for her roles in August: Osage County and Django Unchained, had been missing for 10 days before her body was discovered on Thursday afternoon.
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The cause of death has yet to be determined, although the Native American actress, 32, was said to be feeling suicidal at the time of her disappearance.
Her father, Charles Upham, told a local radio station that his daughter was suffering from bipolar disorder and anxiety at the time of her disappearance, and had stopped taking her medication to treat the problem.
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Misty had moved to the Seattle area, Washington, to care for her father who had recently had a stroke.
She was staying on the Muckleshoot reservation at the time of her disappearance, and was last seen walking from an apartment in South Seattle.
Upham was nominated for an Independent Spirit Award for her role in the 2008 film Frozen River.