Bigelow Brook is formed in Union, Connecticut at the outflow of Mashapaug Lake.

The brook then changes direction and starts flowing to the east, into the town of Eastford.

It turns again shortly after, back to the south, and continues on a generally southerly or south-southeasterly path through Eastford.

[1] Bigelow Brook is popular with fishermen from the area.

Trout are one type of fish that swim in its waters.