Marc:
It so happens that the Portland Wheelmen are doing a westside ride on Saturday leaving from Longbottom's at 9 a.m. I and another Velo rider are planning to join them.
I don't think they provide the exact route beforehand, but here's what their web site says:
West Side Monthly First Saturday Ride:
Distance 37 or 46
miles. Leaves at 9:00 a.m. from Longbottom Coffee, 4894 NW 235th Ave.
From Hwy 26, turn South on NW Shute Rd., East on NW Huffman, then South
on 235th (only one mile from Hwy 26). This Maggies’s Buns or bust ride
covers some low-traffic country roads with a longer option along
picturesque Cedar Canyon Rd. near Banks. Optional stop at Maggies’s in
Forest Grove for a nice selection of buns and drinks could be the
highlight of your day. Level B/C regroup ride. Ride leaders Jerry
Smith 503-659-5727 and Bruce Buffington, NW Bicycle Safety Council
503-466-2501.
The phone numbers are in case you have questions, I don't think there's any need to call and say you'll be riding.