The Hagerman Valley Tree was created by LindaSmithID and reflects most of the people who lived in that Valley. You can find this family tree on Ancestry.
You can contact the Shoshone Public Library, shoshone.lili.org/ and ask if they have a volunteer who will look for Lewis in what they have for genealogy.
Unfortunately Lincoln County doesn't have a genealogy volunteer.
You can find what the University of Idaho has at lib.uideaho.edu/special-collections/genealgl.hym .
You can contact the Idaho State Historical Society, idahohistory.net. Successful Searching!