Hi CJ, I'm not sure if these are your grandparents or not. Hopefully you'll recognize the children's names and be able to tell.
In 1930 Walter and Maud Moore were living in Verden, Grady, Oklahoma. Walter O. Moore, b. MO, 39, marr @ 23, farm laborer. Maud, wife, b. OK, 38, marr @ 21. Gorden E., b. OK, 13. Paskal W., b. OK, 11. Mildren L., b. OK, 9. Bettie C., b. OK, 5.
A Walter R. Moore Age=74 Died=4 April 1965, Multnomah Co. Spouse=Effie. Source=Oregon Death Index 1903-98.
You will find an obituary volunteer at raogk.org.
I'd contact the Clackamas County Family History Society, rootsweb.ancestry.com/~genepool/ccfhs.htm regarding city/county directories.Successful Searching!