Also, be careful of sinkholes and a quicksand-like silty river bottom. Fall River contains stocked rainbow and brook trout. Native browns, rainbows, brooks and whitefish can also be found in the river. The average fish size runs between 8-12 inches, but fish over five pounds are present. Fall River is a fly-fishing only body of water, but a few retreads violate this policy each year, so bring your cell phone and report them to insure their buzz bombs and Zebco's get confiscated.
Hatches occur throughout the day, and many fly patterns work.
Adams, mosquito, Cahill, and midges are all good choices. If the fish aren't feeding up top, try a zugbug, a scud, or a hare's ear nymph, or work streamers under the banks. The key to fishing Fall River is stealth. Light long leaders, good mending skills, and camouflage will provide you opportunities, which may be quite rewarding. Fall River Campground is a nice place to pitch a tent.