Looking for Rainbows

I was headed out this morning on a solo trip. At the last minute i called my brother, and he was free, so we decided on the Provo river. I hate the crouds the Vo always seems to have, so i dont go there often. This day was no different, crouded. But we seemed to be able to fish right behind others and still take nice fish. We were using a little sow (18), tied on a red gamakatsu hook, and it was deadly. There was a massive BWO hatch and we kept nymphing because the bows were killing sows and haresears (14-16). Randy and i both landed some nice female bows in the 18 inch range. Near the end of the day I hooked a male that riped me off (5x). I decided not to rerig because we were leaving soon. Randy went through a few more times and nailed a buck rainbow that was full of spit and vinegar. The thing put up a hell of a fight for a 17 inch fish. Im thinking the lower Provo may have a special strain of rainbow, they seem so thick and strong compaired to other rainbows we have fished locally. Spring is the best time to fish..