I didn't find any record of Cora's death in the Washington State Digital Archives (but not all records entered yet) or the WA Death Index On-Line. However, I'd contact the Sno-Isle Genealogical Society, http://www.rootsweb.ancestry.com/~wasigs/index.htmhttp://www.rootsweb.ancestry.com/~wasigs/index.htm and see if they have the microfilm and can look it up. They might have her burial location too.
A Charles L. Bridgewater died 21 July 1918, Sultan, Snohomish Co., 56 yrs old, Estimated Birth Date-1862. You can order a copy of his death cert through the Center for Health Statistics. See web site http://www.doh.wa.gov/EHSPHL/CHS/cert.htmhttp://www.doh.wa.gov/EHSPHL/CHS/cert.htm .
You can request copies of their obituaries from the Washington State Library, www.secstate.wa.gov/library/ask.aspx . They will search the newspaper microfilm for 60 minutes at no charge & reply with what they find. Successful Searching!