Ahh the choices.
Deckers/Cheesemen Canyon-Deckers took a hit recently with a fast moving wildfire near Trumbull. Fishing it up high could be good this time of year. Mostly nymph fishing with a few dries during the early morning or late evening hatch. San Juan Worm with a pheasant tail, bars emerger or RSII as the dropper. Usually around sz 18-20 this time of year. Streamers in deep pools with low current. Rule for here is--- if you can catch fish here, you can catch fish anywhere. 6x Fluro highly recommended
Waterton Canyon-Super easy dry fly action, only about a mile up from the lot. You won't catch anything big, but it's fun. sz 16-18 Wolfe, Adams Parachute, Caddis
Blue- Great for sight fishing. Look for the big red "Rock" Look at it long enough, it will probally move. 6x-5x Fluro a must to keep from spooking them, and to keep from breaking off on the rocks. Red San Juan with a mysis, WD40 Brown, PMD Bars Emerger. There are some big pigs near the Outlets. Sure it's overfished, but with patience, you can get your PR in the right hole.
Gore Creek-ahh, this is my secret money hole. Big browns... sorry, this is my honey spot.
Fryin Pan-Big fish in here. Bigger than the Blue. There are some heavily fished areas, but for good reason. If you catch the toilet bowl early enough, you can catch another personal best. I watched a fish take my Mysis, and keep moving for about a minute before he realized he was hooked. Needless to say, I did NOT land him.
Colorado River near Parshall. Good dry fly early in the morning. PMD, Adams, Elk Hair Caddis. Take really good bug spray. The mosiquitos are relentless. With this weekends front, it could be really good. Great nymphing up near the confluence.
The list goes on. Along with the list above, I also recommend Discount Fishing Tackle on Santa Fe south of Evans. IT looks kinda dumpy, but there are some guys in there who really know their stuff, and tend to be a little less pretentious.
Good luck and keep 'er bent