First, when you post, it is important to provide enough information about the person(s) you seek to fully identify them from others having the same name. If you have it, always post their name and date of birth. If you don't have their date of birth, identify an approximate age, names of parents, siblings, etc. Basically, enough information to identify them in the US Census and/or other records. For this search, the name of your grandfather is important as he went to this school. To find this school, land ownership in that area would help locate it. The name of "McCauley" was searched, but no valid person by this name was found in the 1920 or 1930 Census. I looked at other postings you had on Rootsweb, but there was no additional information that helped in this search. In your other postings, the date of birth, etc. may have helped produce answers in those also.
The US Geographical Survey
http://geonames.usgs.gov/shows "Sand Flat"
Latitude(DEC) Longitude(DEC) Latitude(DMS) Longitude(DMS)
47.8523820 -118.1360881 475109N 1180810W
Map Name: "Inkster Lake"
The 1920 Census for Davenport, Lincoln Co, WA
David J. Jones, born about 1845/6 in Wales, living with spouse Margaret, 63; daughter Bernice 33, and daughter Madge, 30.
But, in another posting you identified your David Jones was born in Ontario Canada.
Buried in the Mountain View Cemetery is this David J. Jones, August 1845 to December 20, 1924:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=jo...;
It does not appear this person is the correct one. He was the only David Jones in Lincoln County in the 1920 and 1930 Census.
The 1920 Census for Egypt, Lincoln Co, Washington
William A Cleghorn, age 53, born in Iowa to both parents born in Indiana, farmer/general farm, owned his land/under mortgage.
Jennie L, wife, age 51, born in Oregon to father born in Tennessee, mother in Missouri
Mabel F, 14. All children born in Washington
Hazel M, 12
Pearl B. 9
The 1930 Census for Mohler, Lincoln County, had a David Jones, son of Eula (female), born about 1908 in Washington to both parents born in N. Carolina.
For Sprague, Lincoln County, a D.E. Jones, age unknown widower, born in the US. Based on the lack of knowledge of this person, either the enumerator couldn't understand him or another reason; or his information was given by a neighbor or other person that didn't really know him.
For your "McCauley:" There is a family of Clyde R. McCall in Egypt; J. David McCallum in Davenport; McCarthy, McClary, McClure, McCulloch, McCullough, etc. etc. The exact name might help in locating the school.
William A. Cleghorn:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=cl...;
Jennie:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=cl...;
There are other Cleghorn burials shown in Lincoln County.
There is a Karen McCauley buried in Wilbur, 1943; but no others found.
The Bureau of Land Management has a database of land patents issued under the Homestead Act (and other Congressional Land Acts). It shows William A. Cleghorn obtained 40 acres of land in Lincoln County on 4/13/1922, Township 27 North, Range 37 East, Section 8, the Southeast quarter of the South East quarter of that Section.
The location for this land is on the "Inkster Lake" map
This topo map shows the Sand Flat area:
http://msrmaps.com/image.aspx?T=2&S=14&Z=11&X=12...You'll see red squares on the map, they are Sections, by left clicking on your mouse, you can zoom in on the map. Zoom in twice and you can see the Section numbers. I did so, so you can see Section 8 in the map below:
This map shows Section 8
http://msrmaps.com/image.aspx?T=2&S=12&Z=11&X=51...Cleghorn owned the 40 acres in the bottom left corner of Section 8. A Section has 640 acres and is one mile square.
You wrote that your grandfather had an Uncle William Arthur Cleghorn. It might help to identify how he was his uncle, brother of your grandfather's mother, brother of your grandfather's brother. OR, was Jennie the blood line, being the Aunt and William Cleghorn was Uncle by marriage? This information might have better identified if David Jones was related to the Cleghorn's.
I do find a posted family tree for William Cleghorn, but it does not identify the maiden name of Jennie.
The actual information about the school "might" be held in the State Archives.
Ron Bestrom
Tacoma, WA