We have relatively few options for a full-day's fishing due to the weather (the rivers get too darn hot for trout), so this reservoir is one of our only nearby options, though it's said to be the "busiest trailhead in Montana".
Last Labor Day's weather was about like this year's. We fished a gorgeous little creek near Idaho that kicked ass on the opener, but was really tough on Labor Day. Could've been the heat, the summer fishing pressure, or just a fickle day.
It's about the time that grayling start schooling near the inlets so it can be fruitful to swing a mini-San-Juan worm or bright scud at our aforementioned reservoir. But I suspect they haven't started migrating due to this heat, so maybe we'll see some cutthroat and brookies. And sit tight for another week while we wait for autumn to slowly arrive.