There are not that many hatches on the Monocacy, much like the Little Lehigh or Saucon. The major hatches are:
"Olives"
Sulphers
Comparaduns, parachutes, emergers. Try adding some orange. Both species can be hatching at the same time, which can make fly selection difficult.
Small, black (& white). Al's trico. Griffiths gnat. Ants.
Caddis. Green, tan. Try swinging wet flys for something different than the standard dry fly approach. EHC has been good.
Little sh!*
Als rat
Griffiths Gnat
Discuss.