My guess is the population in Segloch is roughly 50/50 Brookies/Browns. Agree though, Browns are increasing, and Brookies are decreasing, relatively speaking. Same thing in all of the Furnace Hills streams. One is already all Browns, the rest (except maybe one) are in various stages of transitioning.
Also, Segloch is not silty, it’s sandy. All of those streams have a lot of red sandstone in them that breaks down to well, sand.
I tried to fish it a little over a month ago. The weekend before all the stay at home stuff started. It was a nice day. I got there about 8:00 AM. I fished the bottom end of the SGL and got back to my vehicle (at the downstream most SGL parking spot) at about 9:00 and found a guy fishing right across from where my vehicle was parked. He said he came from upstream. Got in and drove upstream, past his vehicle, and found another one at the bridge. And then another one a few hundred yards above the bridge. 4 anglers on it at once. I left and went to one of its neighbors, which was empty. Segloch is quite popular for a small, unstocked stream.