May not be the same stream, but the fish sure do look similar in size
All kidding aside, I’ve caught many, many cutthroats in dozens of drainages both coastal streams and willamette tribs where the fish have white tips on the fins I personally do not consider that an indicator of a rainbow.
Cutthroat trout display the widest range of physical characteristics and life histories of any trout in Oregon imo. They vary so much in size, shape, color, pattern, run timing/migrations/ and general behaviors.
I see a lot of the time when a colorful cutthroat is posted most people jump to the cutthroat conclusion, but an actual cuttbow? I haven’t seen too many of myself. Most coastal rainbows always go to sea and spawn with their own. And most east slope coast range streams do not have resident rainbows in them either.
You’re more likely to encounter a cuttbow in streams that originate in the cascades, and hold healthy populations of both resident rainbow and cutthroat.
Here is a sea run coastal cutthroat
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Here’s a resident coastal cutthroat from the same stretch of river
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Here are a few east slope coast range (willamette trib) cutthroats
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Here are a couple from the next drainage over and you can see the vast difference in size + appearance. These fish also live a completely different lifestyle
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