It's been many years, but once I ventured on a "scouting trip" to Mill Creek in late July and found a few trout still holding in the deeper holes away from the access points. It was a wet year when the Caney was not doing well. I would assume some of those fish were likely to successfully hold over, because a trout that makes it to late July is likely to make it through the whole year. Mill Creek has a reputation for holding over some fish in wet years, and I've talked to more than one person who has claimed that they've caught 2-3 lb. rainbows there. As with all of the spring creeks, the survival potential of the fish depends on how much rain we get in the summer. You have to have enough spring water entering the system to keep the creek in a non-lethal temp range.
Many years ago, both Mill Creek and the Piney River (where Mill Creek ends) would hold trout. In fact, the Piney is still listed in some records as a "naturally reproducing trout stream." However, municipal development has sucked most of the water out of the Piney and the springs that feed it, and it no longer has enough flow to stay cool enough to support trout.
I quit going to Mill Creek because a lot of the landowners are assholes and think TWRA stocks the creek for their exclusive benefit. TWRA says landowners are "expected" to grant access, and maybe the situation has improved in the intervening years, but I encountered a lot of "no trespassing" signs, unfriendly landowners, and barking dogs.
This ought to be a really good year for the spring creeks, since we had a cool, wet summer last year and we seem to be due for another one if the El Nino weather condtions hold up. I would expect a good likelihood of seeing some nice holdover fish. So if there was ever a year to check out Mill Creek or any of the other spring creeks, this is probably it.
bd