Hi Darlene, I don't know the answer to your question about Pine Grove. Columbia County doesn't have a Gen. Soc. You might want to check out Columbia County, WA USGenWeb site, www.rootsweb.com/~wacolumb/ . AHGP Columbia County, WA, www.usgennet.org/usa/wa/state1/shells/columbia.htm .
I did find a Dayton Historic Depot, www.daytonhistoricdepot.org/ and someone there might be able to answer your question.
However you also said you were looking for descendants of John Walter "Jack" Manning and I did find addl info about that family.
An Unnamed Manning was born 18 Nov 1915, Columbia, female, Father's Name=John Wesley Manning, Mother's Name=Gladys Munden. Source: WA Birth Index 1907-1919.
A Marjorie Morle Manning was born 29 Dec 1918, Location=Columbia, Father's Name=John Manning, Mother's Name=Gladys Munden. Source: WA Birth Index, 1907-1919.
W. John Manning and his family were living in 1920 in Pine Grove, Columbia Co, WA. W. John, b. WA, 42 yrs old, laborer stock ranch; Gladys, wife, b. WA, 27; W. William, b. WA, 2 8/12ths; J. Lonnie, b. WA, 6 1/12; R. Robert, b. WA, 4 3/12ths; Margery, b. WA, 1 1/12th and E. Merl Allen, sisterlaw, married, b. WA, 21.
In 1930 Gladys has married Eugene Sutton and most of her children are living with them in Huntsville, Columbia Co., WA. Eugene Sutton, head household, b. WA, 30, farm laboer; Gladys, b. WA, 31; Wesley Manning, stepson, b. WA, 17; Marjorie Manning, stepdau, b. WA, 11; Dorothy Manning, stepdau, b. WA, 5; Eugene Manning, son, b. WA, 1 7/12th. The Census says Eugene Manning but I believe it should be Eugene Sutton who is probably alive.
In 1930 a Robert Manning, b. WA, 14, was living in Star, Columbia Co. with the Lewis and Lina Hunt family. He's listed as a lodger.
A Gladys Sutton, Last Residence=Spokane, Spokane Co. born 30 Dec 1897 and died March 1980. Her soc. sec. # was assigned to her in WA in 1973. Source: Social Security Death Index.
A Gladys R. Sutton died 29 March 1980, Spokane City, Age=82, Estimated Birth abt 1898, Residence=Spokane per death cert #006537. Source: WA Death Index 1940-1996.
I can't tell for sure if this was your Gladys or not. However, you can request a copy of her obituary from the Washington State Library at no charge. http://www.secstate.wa.gov/library/ask.aspxhttp://www.secstate.wa.gov/library/ask.aspx . Supply them her name, when and where she died. They will look in the newspaper microfilm for 30 minutes at no charge & reply with what they find.
A Dorothy L. Manning died 19 Feb 1994, Moses Lake, Grant Co, Age-69, Estimated Birth Year=abt 1925, Residence=Moses Lake per death cert #005369. Source: WA Death Index 1940-1996.
A Dorothy L. Manning Last Residence=Moses Lake, Grant Co., was born 27 July 1924 and died 19 Feb 1994. Her soc. sec. # was assigned in Missouri before 1951. Source: Social Security Death Index.
Again I'm not sure this is your Dorothy and I'd request a copy of her obit which should help you decide.
If they obits work out, hopefully they'll list survivors and you can look up their contact info using www.switchboard.com.
Dayton is a very small town and you find the Manning or Sutton surname there using www.switchboard.com you might or might not be related. Successful Searching!