Great report & pictures!
I haven't been up there in years. About time I start getting back into it. My oldest son & family just moved into their "new (to them)" house in Monkton. He's only about a mile from the river & has expressed some interest in trying some fly fishing!
Even though I haven't been there in awhile, I have fished the Gunpowder many times. I wouldn't overlook streamers or leeches, small crayfish patterns, or terrestrials this time of year.