Here are some archive photos from the City of Portland showing the end of the SP (lower left corners) and the UP making a upper left to upper right curve. The bright building next to the bridge under construction is a sewage pump. This is still there and the connector (Tom, correct me if I am wrong) will pass between it and the new UP offices.
A2005-001.184 Eastbank Freeway construction of connections to Banfield Freeway looking north
A2005-001.669 NE Union Ave looking north from E Burnside St
-K