Outflow to Ramcat: the water you can actually wade
Start at the Outflow Recreation Area below Youghiogheny River Lake dam in Confluence, where the Corps keeps parking, accessible platforms and the coldest water on the river. From there down to where the Casselman River comes in, the Yough is a normal-sized trout river with gravel bars, ledges and riffle-run-pool structure, and both Dark Skies Fly Fishing and the Ohiopyle Trading Post call it the one stretch that is usually wadeable. The Ramcat put-in lot, provided by Ohiopyle State Park at the end of Ramcat Road, is the other parking spot, and the Great Allegheny Passage runs the bank between them.
The catch is the dam. Releases can put the river up two feet in an hour, and everyone who writes about this reach says the same thing: know the release schedule before you step in, and step out when the color changes or the rocks you were standing on disappear.
Ramcat to the Route 381 bridge
Below the Casselman the river roughly doubles and the Middle Yough proper begins: nine-plus miles of Class I and II water through Ohiopyle State Park to the Route 381 bridge in Ohiopyle Borough. Chestnut Ridge Trout Unlimited built stairways down from the GAP trail so wading anglers can reach the water without sliding down the bank, and the stairs above Schoolhouse Rapids are a common first stop. Most of the fish in this reach are PFBC fingerling stockings that grew up in the river, plus adult and trophy-size fish from the Chestnut Ridge co-op nursery in the tailrace.
Do not miss the take-out. After Elephant Rock (a big mid-river boulder; pass it on the right) the Take Out sign is on river left, and it is the last easy landing before the current picks up toward Ohiopyle Falls just below the 381 bridge. The Trading Post and Wilderness Voyageurs both run morning fishing shuttles from Ohiopyle to Confluence, and Wilderness Voyageurs rents rafts and canoes for the run.
Below the falls
From Ohiopyle down to the Bruner Run take-out is the Lower Yough, Class III to V whitewater, no stairways, steep rocky slopes and no road. Trout live there and pressure is close to zero, but you get in on foot through Ferncliff Peninsula or by bike on the GAP and then scramble. The Loop, just below the borough, is the usual target. Below Bruner Run the river mellows toward Connellsville and the trout thin out into smallmouth; the Camp Carmel road is the access most people mention, and the state's trout management ends at Connellsville.
The Ohiopyle gauge, in feet and in cfs
No shop on the Yough publishes a cfs wading range; the outfitters talk in stage on the USGS Ohiopyle gauge. The Ohiopyle Trading Post books its wade-oriented fishing trips (dam outflow to Ramcat) when the gauge reads 2.0 feet and under, runs the full Middle Yough float above that, and calls 1.6 to 2.2 feet normal summer flow. On this summer's USGS readings 1.6 feet has run about 790 cfs and 2.0 feet about 1,030, so this page compares the live gauge to 600 to 1,000 cfs. That is a wading band for the Confluence-to-Casselman water; the Ramcat-to-Ohiopyle reach is a float at any flow, and the USGS record shows the river spending most of July through October between roughly 600 and 950 cfs.
Water temperature runs the other way. Wilderness Voyageurs reported 48 degrees at the outflow, 56 in the trophy section and low 60s at Ohiopyle on one summer week, and the Orvis report from Nemacolin was warning about catch-and-release temperatures in September. The first two miles below the dam are the safe summer bet.
What is hatching and what the fish actually eat
The Yough was gutted by a 1993 mine-acid spill on the Casselman and its hatches are still filling back in. Wilderness Voyageurs' shop list for early summer is Sulphurs and Pale Evening Duns, Light Cahills, Brown Drakes and Coffin Flies, tan caddis and Blue-Winged Olives, then Slate Drakes (Isonychia) size 12 to 14 off and on daily from July into September and Tricos at first light. DIY Fly Fishing puts Little Black Stoneflies, olive and tan caddis, Quill Gordons and March Browns in spring, and October Caddis and olives in fall; the Orvis report adds midges 18 to 24 all year in the tailrace.
Most days the fish are caught under the surface. Pat's Rubber Legs with a Pheasant Tail or Hare's Ear 8 to 10 inches behind it, split shot added, is the shop rig for the fast water below Ramcat, a dry-dropper with a size 16 Stimulator over a Pheasant Tail is the rig for the Casselman confluence and the water above Ramcat beach, and a size 4 to 6 Clouser crayfish gets the big fish in the Middle Yough. Ants and beetles work through the mid-day heat.
One 18-inch trout, and different rules above and below
The 2026 PFBC summary lists 9.18 miles of the Youghiogheny, from the confluence with Ramcat Run downstream to the Route 381 bridge at Ohiopyle, as All Tackle Trophy Trout. That means open all year, 24 hours, no tackle restriction, an 18-inch minimum and a limit of one trout from 8 a.m. on opening day (April 4 in 2026) through Labor Day, and no trout killed or possessed from the day after Labor Day until 8 a.m. on the next opening day. A boat angler can carry bait and legally caught fish through the section as long as the boat does not stop to fish.
Above and below that, from the Casselman River confluence down to Ramcat Run and from the 381 bridge down to the mouth, the river is under Miscellaneous Special Regulations: no closed season on trout, 5 trout from opening day through Labor Day and 3 trout from the day after Labor Day to the next opener, inland rules for everything else. Ohiopyle State Park charges a launch fee, and the reservoir itself is a Pennsylvania-Maryland boundary water where either license works from a boat but not from shore.