Do Whitefish move into the middle provo

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I was wondering if Whitefish move out of Deer Creek, into the Provo or if they are always in the river? I was upstream of Charleston Bridge Friday, fly fishing baetis nymphs, and caught 30 or so Whitefish, most from one school in one run, but only one trout. The thing that I was most surprised with was the size of the fish; 3 of them went 4 lbs, several others were 2-3 lbs. They were large, fat and healthy, hard fighting fish. Considering the state record is 4 lbs 12 ozs, caught out of Deer creek, I thought that maybe these larger fish are migrating out of the lake.
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