Also known simply as Johnson Reservoir, this body of water is unique and challenging. Unlike Fish Lake, this reservoir's max depth is only around 20 feet. It traditionally held trout, but migrating chubs, suckers, and yellow perch have taken over. In 1999 Johnson Valley Reservoir was stocked with tiger muskie, a sterile hybrid between pike and muskellunge, in hopes that these voracious predators would keep the non-sportfish populations under control.
Since 2000, the Utah Division of Wildlife Resources has stocked Johnson Valley Reservoir with tiger muskie multiple times, the most recent being in April of 2020 when 450 muskie were released into the reservoir. Tiger trout were also stocked in 2020, and may offer angling opportunities as well.
Because the reservoir is so shallow, the best fishing conditions for tiger muskie don't last long. Once aquatic vegetation starts to grow several weeks after ice-off and the water clears up, anglers have the best chance of catching a tiger muskie of over 40 inches, which is a monster, especially for Utah. Johnson Valley Reservoir is one of the few Utah bodies of water where tiger muskie are present, and it's likely the least crowded of all Utah tiger muskie fisheries.