cliff,
More info;
According to Cornish & Whitten, in "The Architects of Golf", Ottawa Park (the first nine) was designed by that household name, Sylvanus Peirson Jermain, presumably in 1898.
Interestingly, there is no mention of Ross. Neither is there a mention of Ottawa Park in the Ross book, "Golf has never failed me".
However, other sources claim that Ross did the second nine (and probably changed the first) in 1918. Since you live there, you might want to check on the source of that information, and share it with the Donald Ross Society since they are always on the lookout for new info. Posting that info here will certainly put you in touch with the right people. Interestingly, a local public course in my area recently uncovered their Ross roots (Jeffersonville), so it's an ongoing effort.
Also, C&W cite Arthur Hills as having done some redesign work in 1974, of an indeterminate nature.