I've never fished it, so you have probably researched the regs more than me, but I found this in the 2013 odfw regs.
Little Fall Creek (Lane Co.)
Open for adipose fin-clipped Chinook salmon; adipose fin-clipped steelhead; and non-
adipose fin-clipped steelhead greater than 24 inches all year (mainstem from the mouth
upstream to 200 feet below the concrete fish ladder, approximately 12 miles).
• Open Jan. 1-April 26 and Nov. 1-Dec. 31, catch and release for trout
•Open April 27-Oct. 31, 5 trout per day, 8 inch minimum length.
•Use of bait allowed