See: Bird Observer, "Birding the Mud Flats and Tidal Marsh of Charlestown Breachway, Rhode Island" Vol. 46, No. 3, June 2018

This is one of the best shorebirding area in Rhode Island. During the summer, hundreds of shorebirds feed on the mudflats and hundreds of terns roost on the flats. Getting to the birds requires a ford across a narrow channel northeast of the Charlestown Breachway. Depending on the tide and your height, you can expect the water depth to be between knee and waist depth. It is also possible to access this spot from a kayak, removing the need to wade through the water to get to the mud flats.

Depending on which access point you use, you will most likely have to pay a small entrance fee to go birding at this location. Restrooms are available at the Charlestown Breachway during the active camping season.