I passed the west end of this trail as I was leaving the Frank Estate. When I saw the east end I jumped the curb and rode the easy trail the half block back.
Saturday, December 19, 2020
45.46788888888889, -122.75149444444445
google map 
45.46845277777778, -122.75241111111112
There is another entrance to this area from Oleson Road between this and Fanno Creek Trail. I've seen kids trail riding this on summer afternoons.