Hi Erik, I think the best way to find ancestors after the 1930 Census is to find the obit of a person. The obit generally lists descendants and where they are living. Then I use www.switchboard.com for addresses & phone numbers.
A Jens Elgaard died Lane Co 18 June 1938 per death cert #273; spouse=Kjerstin. Source: OR Death Index.
Check out Random Acts of Genealogical Kindness, www.raogk.org, choose Oregon, choose Lane Co. There is a volunteer who will look up obits. If that doesn't work, re-post & I'll provide the pay sites.
I'd re-post Chris Elgaardon the Nebraska, Cass Co., Message Board.
A Magdalene E. Rasmussen [Magdalene E. Elgaard] was born 13 Sept. 1903, OR. She died 20 Sept 1986, Fresno Co., CA. Mother's Maiden Name=Nielsen and Father's Surname=Elgaard. Source: CA Death Index, 1940-1997.
I'd check RAOGK first and if not successful, post to California, Fresno Co. & ask how to get a copy of the obit.
A Margaret Elgaard Petersen [Margaret Elgaard Elgaard] was born 21 March 1894, Massachusetts and died 6 Oct 1991 in Fresno Co., CA. Mother's Maiden Name=Nielsen and Father's Surname=Elgaar. Source: CA Death Index 1940-1997.
Same procedure as for Magdalene.
An Anton Winther died Lane Co. 21 April 1934 per death cert #143; spouse=Sine. Source: OR Death Index 1903-1998.See Lane Co. method mentioned above.
A Soren Pet [name probably shortened] Winther died Lane Co., 2 April 1975 per death cert #75-05787, age=84; birth date June 1890; Spouse=Anna. Source: OR Death Index 1903-1998. See Lane Co. method mentioned above.
An Arthur William Winther died Multnomah Co 2 Aug 1990 per death cert #90-15115, Age-=77, Birth Date=11 June 1913; Spouse=Sylvia. Source: OR Death Index 1903-1998.
There is a volunteer for Multnomah County on www.raogk.org. If that doesn't work out, re-post and I'll send you the pay sites. Successful Hunting!