From the general regulations for the the Willamette zone:
Species Name Catch Limits Length Limits and Other Specifications Season
Trout Lakes: 5 per day, 2 daily limits in possession.
Streams: catch and release only, except as noted under Special Regulations.
• Angling restricted to artificial flies and lures in streams. See exceptions
under Special Regulations where use of bait is allowed.
• 8-inch minimum length.
• Only 1 trout over 20 inches in length may be taken per day.
• Rainbow trout over 20 inches are considered steelhead in streams.
• Closed to angling for bull trout.
• Kokanee included in trout limits except as noted under Special Regulations.
Lakes: Open all year.
Streams: Open May 23-Oct. 31 see Special Regulations for this zone and Willamette Zone map on pages 46-47 for streams that are open April 25-Oct. 31