The declaration makes programs available to help individuals and businesses affected by the March 22 slide that killed more than two dozen people.
Washington Gov. Jay Inslee said Wednesday that the declaration also provides help for debris removal and emergency measures such as barricades, sand bags and safety personnel.
In asking for more federal assistance, Inslee said in his request Monday that about 30 families need help with housing and other needs.
Inslee has said estimated financial losses have reached $10 million.
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