TriMet has announced that the Eastbank Esplanade bicycling and walking path just south of OMSI to SE Caruthers Street will be closed for 14 months. The closure is due to construction of the Portland-Milwaukie Light Rail bridge. Here's more from TriMet:
Two contractors, Kiewit and Stacy Witbeck, will be working in the closure area to move and rebuild a portion of the Eastside Greenway Trail, build walls and construct the landside piers and abutment for the Portland-Milwaukie Light Rail transit bridge.
During the trail closure, pedestrians and cyclists will be detoured to SE Water Avenue which has new sidewalks and bike lanes and connects directly to SE 4th Avenue and the Springwater Corridor Trail.