My map shows Arnold Creek Natural Area just east of here where SW 11th Street meets Arnold Street. You have to fiddle with the map scale to see it. Don't expect to see it in person. All I found were no trespassing signs.
Sunday, September 5, 2021
45.4453667, -122.6944806
google map
45.4442861, -122.6937333
BOUNDARY 45.4435811, -122.6960177
BOUNDARY 45.4476303, -122.6879271
I rode uphill hoping to approach the Natural Area from behind. I met a suspicious home owner that suggested if I want to get through to the east I should go up one more block to Coronado Street. See SW Coronado Street Trail