Beaver ponds can hold big fish even if the impounded stream is tiny. Even if a tiny stream rushes down the mountain, if the beavers have made their homes, the water is deep and fat enough to hold some nice fish. Government agencies often stock a lake one year and not the next. If the lake didn't endure winterkill, the holdover trout may have grown to braggin' sizes. Contact the agency to see if they stocked the lake in question.
Most agencies provide booklets that list all the available trout water in their state.
You'll be amazed to find streams listed that you never knew existed. Those are prime candidates for exploration. I found another southern Colorado stream this summer, let's call it MyNewFavorite Stream. The only access points were downstream, where the stream hurried down the mountain like it was being poured out of a spout. No guidebooks ever mention this stream as a viable fishery.