TriMet will close a stretch of track in downtown Portland for repairs May 8-21.
Do not take MAX. Don't do it. If you need convincing:
From the east side, on an average morning commute, 63 trains cross the Steel Bridge into downtown. During the disruption, the number will be 29.
From the west side, 32 Blue and Red Line trains normally arrive downtown. During the disruption, it'll be 18.