A dip in 57th Place alerted me to this trail. I rode mostly a gentle climb dismounting for one heavily rooted patch and a switchback to an upper level.
Friday, January 22, 2021
google map 
45.4501562, -122.7358724
45.450747222222226, -122.73465833333333
45.4511553, -122.7335876
I carried my bike up these stairs one step at a time. Once on pavement I turned to take this picture.
See Dickinson Park Stream Enhancement Project. page