We usually fish out there a time or two each spring because the water by the hatchery is so well stocked. You can catch the normal 10" stockers, some yellow colored trout which are a weird version of rainbows, and some big brood stock fish that have their fins all torn up.
Caught a handful this afternoon on flies without too terribly much effort. Popular place and if you're not catching fish switch tactics and or spots.
The picture is of a fish I promise, but you need polarized glasses to see it.