The club website has a bunch of information, but doesn't appear to be complete. Here's what I have:
-The 1899 Golf Guide notes the first course was laid out in 1896.
-Dec. 10, 1899 New York Times notes club purchased land to lay out an 18 hole course.
-The 1900 Harper's notes an 18 hole course was laid out in 1899 by committee.
-Sept. 1909 American Golfer notes work by Barker as a new layout.
-April 23, 1916 Oregon Daily Journal notes improvements decided on by Gordon Voorhies and H. Chandler Egan to be made including changing the 2nd, 9th and 11th greens and adding 15 bunkers and altering 31 old ones.
-Moffet is credit with doing some work around 1918, but it may have been much earlier. He was noted as the pro early on, with J. Martin Watson the pro of record from as early as 1916 to 1920.
-Nov. 12, 1922 Oregon Daily Journal notes plans to add a second 18 hole course with A. Vernon Macan having surveyed available ground. Not sure if he did work to the existing course at this time.
-Egan designed new greens on 9 holes in 1924 and supposedly did some work in 1930.