Last summer I got to see something amazing and I never seen before!
Rainbow trout leaving a lake and making it up a VERY small creek miles and miles up to spawn. Allen Creek... These fish were not acting like normal creek trout. They were flat out FURIOUS! You could catch them on a bare hook if you could stay stealthy and out of vision. I must of C-n-R'd 50-60 trout at least on that trip. All I used were little tube jigs. You stand way upstream and jig them down off the bottom and these trout would come and SLAM the jig!
They were all colored up and ready to spawn. A few really large ones were caught by me and my brother. 15in.+ Kept a couple brooks for the frying pan.
From what I know trout can spawn more than once. That's what a brood trout is at a hatchery. They just use them over and over to get eggs out of. Steelhead can spawn more than once and return to the ocean, hence the name "drop back."