dillon is a dink filled crap hole, with few big fish (although they do exist). lake got ruined by mysis shrimp and is filled w/ suckers. theres big browns in there, kokanee and stocker rainbows.
seriously just do yourself a favor, drive the 45 mins up highway 9 and ute pass rd, and just fish williams fork. fish there are plentiful, and much better quality.