The Potomac isn't that great to ride on except for the upper parts above DC. In DC the river is tidal, but the salt content in the water is extremely low, so low you'd never be able to tell the difference between it and fresh water. Would you consider that brackish? I wouldn't. From Great Falls down the problem is big boats, way downstream there are some coves to ride in. Once you get down below Alexandria, the salt content gradually increases until you get out to the bay. When I say gradually, DC is about 85 miles from the mouth of the river and there is a decent amount of flow coming through DC that pushes the salt water downstream.
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