Upper Gray Rock Lake is a small, 4-acre lake nestled in the Castle Crags Wilderness of Northern California. At an elevation of 6,300 feet, it's known for its productive fishing, primarily for small Rainbow and Brook Trout, with the best fishing often occurring in spring and fall. Access involves a rugged drive on unpaved roads suitable for high-clearance vehicles, followed by a hike, leading to this remote, scenic spot.