The river's source is Ponaganset Reservoir in Glocester, where water still flows naturally out of the lake, unimpeded by a dam. It then flows roughly southeast through Glocester and Foster, then into Scituate to the Scituate Reservoir. The river used to converge with the Moswansicut River to form the North Branch Pawtuxet River in the area that is now flooded by the reservoir.
Below is a list of all crossings over the Ponaganset River. The list starts at the headwaters and goes downstream.
- George Allen Road
- Ponaganset Road
- Plainfield Pike (RI 14)
In addition to many unnamed tributaries, the following brooks feed the Ponaganset:
- Shippee Brook
- Winsor Brook
- Dolly Cole Brook
- Maps from the United States Geological Survey
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
- Governor's Task Force on Dam Safety and Maintenance – Final Report, January 2001
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