I left Boulder seven years ago. When I was back there I used to guide for the Estes Angler. Are they still there across from the slide.? If I remember correctly Bear Lake and Lily where the first two to receive the greenbacks. I used to fish for them in Lily every spring during run off. If they are still there and spawning they will be very visible all along the dam on the road side of the lake. Lily fished awesome up until summer when it weeded up.