According to the Oregon death index-the listing for Elmina in 1919 had a comment OSH. That stands for the Oregon State Hospital.
There is some history on Blashel Foster and the Church in Dayton Oregon: The Dayton Christian Church gives its own date of founding as 1890. Blashel Foster and his sons George and William were early members. George married a daughter of Robert Addison, while William was married to a daughter of William Hibbart. (Notice they married within the Faith.) These were among the early Christian families that moved here from Illinois.
For more information on the 1919 death certificate-you could order it from the state archives. Let me know if you have any questions.