But you'll never see it if you have to drive to it. The canyons, both the Grand and Black, are difficult to get into, more difficult to move along. Most access is at points along trails, where you can fish a few pools or runs, then have to climb back up, hike to the next access point, descent to fish again. Most trout in the upper river, and its tributaries like Thorofare, are not resident. Runoff typically last until early July.
Trout finish spawning and back down from the tributaries soon after that.
They hang out for weeks in the bemeadowed upper river, furnish it with fish out of proportion to its meager carrying capacity. These lake fish are far larger than you would expect from the size of the stream. They average sixteen inches. The largest weighed over three pounds. Heed a couple of cautions about the upper river.