No dams, so the rain decides
Nothing regulates the Greenbrier. River Ridge Campground at Alderson calls it the longest undammed river in the eastern United States, 173 miles long and, per Outdoor Adventures, the New River's largest tributary. Outdoor Adventures in White Sulphur Springs puts its levels down entirely to rainfall and cave drainage. That makes the season simple: Outdoor Adventures expects the river warmed and fishable by mid-April with dependable float levels until mid-July or early August, and late-summer storms or a passing hurricane can stretch things into fall.
When the river drops too low to float, the Greenbrier River Trail takes over. The West Virginia State Parks trail runs 78 miles on the old railroad grade from Caldwell to Cass, crossing 35 bridges, and Outdoor Adventures and On The Fly South both describe anglers riding it with a rod strapped on and wading the shoals wherever the trail meets the water.
Cass to Clover Lick: summer wading in Pocahontas County
Up top the river is often 200 feet wide but shallow, and On The Fly South says that in summer and fall you can wade almost all of it through Pocahontas County. Their crew fished from the Cass trailhead, at Cass Scenic Railroad State Park, down to Clover Lick, skipping the shallows and working the shaded pools, including the one at the old bridge pilings at Clover Lick. Expect plenty of 12 to 15 inch smallmouth and rock bass rather than trophies; a 2 to 3 pound fish is a good one up here. The headwaters also clear fast after rain, so when the lower river and the New are muddy this is the place to go. Seneca and Calvin Price state forests, Watoga State Park and the Monongahela National Forest all front the river in this county.
Trout are part of the upper river too. WVDNR stocks 4.25 miles from Cass downstream to the Sitlington Bridge once a month from February through May, the Marlinton section from Minnehaha Springs down eight miles once a month from January through April, and a stretch below Durbin twice monthly in spring. Holdovers turn up in June.
Anthony to Alderson: the float sections
WVDNR's District 4 guide lists the lower river in floats: Renick to Anthony 9.5 miles, Anthony to Caldwell 12, Caldwell to Ronceverte 6, Ronceverte to Fort Spring 8.5, Fort Spring to Alderson 6, Alderson to Talcott 13, Talcott to Barger Springs 5 and Barger Springs to Willowwood 6. The Greenbrier Valley tourism office names Anthony to Caldwell, Caldwell to Ronceverte, Ronceverte to Fort Spring and Fort Spring to Alderson as the popular half and full day floats, all quiet pools broken by easy Class I and II riffles. Shuttles and guides run out of Lewisburg and White Sulphur Springs; River Ridge Campground no longer runs shuttles.
The Caldwell to Ronceverte slot
WVDNR's 2026 regulations set one special bass rule on this river: on the six miles from the U.S. Route 60 bridge near Caldwell downstream to the U.S. Route 219 bridge at Ronceverte, all smallmouth, spotted and largemouth bass from 12 to 20 inches go back at once. The daily creel is six bass with only one over 20 inches, and bass under 12 inches may be kept. Elsewhere the statewide six-bass creel applies with no minimum size. Walleye between 20 and 30 inches must be released on the whole Greenbrier and its tributaries, two a day. Muskies are one per day with a 30-inch minimum, and trout follow the statewide six-fish creel.
A Jackson Kayak writer who floated that six-mile slot section found average smallmouth around 9 inches with a few to 15 and a heavier fish lost, all on Chuck Kraft's size 4 Kreelex, Clawdad and CK Baitfish on a sink tip.
The Alderson gauge in feet and cfs
This page reads USGS 03183500 at Alderson, the middle of the float water. River Ridge Campground likes 2.5 to 4.5 feet on the Alderson gauge for paddling; on the current rating that is roughly 200 cfs at the low end and about 3,000 at the high end, which is more water than most bass anglers want. The 200 to 1,000 cfs band shown starts at River Ridge's floor and tops out near the gauge's 75th percentile for June and July. July's median since 1896 is about 400 cfs, August's under 300 and September's under 200, which is when the floats turn into drag trips and the trail and wading take over. The Hilldale gauge (03184000) near Hinton reads the last few miles.