I have fished the Sandy for a very long time . This is what I know . The Sandy gets a pretty decent run of spring chinook starting end of May. I like Oxbow Park and Dodge Park. Spinners and jig twitching , bobber and eggs sometimes. The coho run is pretty good also. Same methods . End of August. There are winter steelhead in Dodge Park right now but most of them are " natives " . I would say about fifty percent of springers and coho are so called natives. I know I will get grief for this from O.D.F.W. apologists but they are not natives , just unclipped fish. I guess that can be debated forever. I landed 20 coho last year , 8 were keepers . Landed 15 springers , 4 were keepers. But I know one guy that got 17 springers , all keepers . Luck of the draw. All at Oxbow Park. Summer steelhead fishing is OK at best . Winter steel is a disaster. You can join the snag fest for coho at Cedar Creek , not for me. All of this is from the bank. If you want more details you can P.M. me and leave a phone number , to much to type. I really like Oxbow . It can get a little crowded at times but it is still pretty mellow unlike that circus at Oregon City. A few months back I called the hatchery at Cedar wanting to know what the winter steelhead count was for last year . Some employee refused to tell me and said that we were just spoiled from the good runs of the past and hung up on me. Never had the chance to get a name so that I could help him with an attitude readjustment. Despite all this I love Oxbow and Dodge Park.
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if you want data on returns to ODFW hatcheries you can find it in the ODFW Annual Propagation reports on their "Hatchery" page website. Returns are shown by species and hatchery in Table 13. 2021 is there along with previous years reports.