The Gunpowder River …
Isn’t a major tributary to the Chesapeake Bay.

And on many maps you cannot see it named. That doesn’t make it any less of a vital water way to keeping the bay clean. It’s a bit of an untamed river. Farther north are the Pretty Boy and Loch Raven Reservoirs that supply water to downstream Baltimore. And back in the era when running rivers were a local power source, it had a mill or three along its length. But more or less those water works have washed away. It’s good to see the downstream two-thirds of the river running free.