From its confluence with Crystal Springs Creek, Johnson Creek flows south about, re-entering Clackamas County, passing the USGS gauge station at Milwaukie at RM 0.7, and emptying into the Willamette River at Willamette RM 18.5 (km 30).
Johnson Creek flows south about, re-entering Clackamas County, passing the USGS gauge station at Milwaukie at RM 0.7, and emptying into the Willamette River at Willamette RM 18.5 (km 30). This is from its confluence with Crystal Springs Creek.