You are incorrect.  The land is part of the Willamette Greenway Trail Program established in  1967 Oregon legislature as a public right of way and owned my the city.  The 1973 Oregon legislature passed the Willamette River Greenway Act  see the text of the law here http://www.oregon.gov/LCD/docs/goals/goal15.pdf

If you look at the map you will note the trails name is "Willamette Greenway Trail"  this is not coincidence. 

Making repairs does in no way allow for the McCormick Pier condominium to take possession of public land. If you bothered to do any research you would have hit upon this fact.