The key to northeast Fitchburg

Where Baker Brook, Pearl Hill Brook, and Mulpus Brook form wooded valleys:

The main "key" is the conservation land parking on Rt 113 with access over to Pearl Hill Brook to the west; or north up beside Stagecoach Rd all the way to Mulpus Brook. But there is also parking at Coolidge Park (a baseball field) to access the lower valley of Baker Brook. 
It is strange that I looked at the map for years without seeing these possibilities. Now I have enough for a few weekends and....it's Fitchburg!!!!