That’s right, the Patawmack River, not the Potomac. Check out this cool map of what would become the City of Washington. It was done around 1893, near the city’s centennial.
Source: Library of Congress
That’s Right – The Patawmack River, Not the Potomac: An Early Map of Washington
Actually it’s an 1893 reproduction of a map done in 1792…. Think before you post.