[2] The river is formed by the confluence of Cutler Brook with an unnamed stream, west of the village of Harmony.
The river flows in a southeasterly direction to Waterman Lake, then east past the village of Greenville.
The list starts at the headwaters and goes downstream.
In addition to many unnamed tributaries, the following brooks feed the Stillwater:
This article related to a river in Rhode Island is a stub.