East Bank or Water Avenue to Marquam On Ramp Stub

This freeway stub is located on the east side approach of the Marquam bridge. It was to be an on-ramp of some type. The question is: where was this ramp bringing traffic from? MLK? The Morrison bridge? SE industrial area? In 1987, the city did a study about an East Bank/Water Ave on ramp that would have linked with this ramp. Unsure about it's original purpose when the bridge was built back in the 1960's.

Reference: East Marquam Interchange and Study Options, 1987, ODOT