For the clackamas river the regulations state under Special regs in willamette zone.
Mouth upstream to River Mill Dam:
Open for fin clipped trout May 22-Oct 31, 2 trout per day and no minimum length
Open for fin clipped Chinook salmon, adiposed fin clipped Coho salmon, and adiposed fin clipped steelhead entire year.
Use of bait allowed.
No angling from a floating device between River Mill Dam and ODFW markers located approximately 100 feet upstream of hatchery intake structure.
River Mill Reservoir up to Cazadero Dam:
Open for fin clipped trout May 22-Oct 31, 5 trout per day, 8 inch minimum length
Open for adipose fin clipped Chinook and fin clipped steelhead entire year.
Trout over 20 inches are considered steelhead
Open for adiposed fin clipped Coho salmon Aug 1- Oct 31
No angling between markers 400 feet upstream and 100 feet downstream from Faraday powerhouse June 16-Oct 31
No angling from the entrance of the fishway/fish trap at Casadero Dam downstream to yellow deadline markers (approximately 275 Feet)
there are a few more special regulations regarding the other tributaries and the mainstem clack upstream from cazadero dam but just pick up some regulations and the info pertaining to that will be on page 50. Hope this nets ya the info you want