Welcome spiggy212,
There is a lot of good info here. How do you get at the fish? Fish from the bank, kayak, boat or wade?
With a canoe or yak there is good fishing in Antietam creek (put in at Devils Back bone on Rt. 68)
There is Greenbrier state park, good for boat, yak or bank fishing.
There is Beaver Creek which is mostly trout fishing.
There is the Monocacy River (Frederick) good canoe & yak fishing. Put in at Mouth of the Monocacy Park.
Many places on the Potomac, good wade fishing for smallies this time of year.
There is a small pond (Hamburg Pond) in Gambril park. I've caught a few nice smallies there.
Good luck and let me know how you make out with the fishing,
Webbster