The Upper Patuxent River encompasses the area shoreward of a line beginning at a point, at or near Lat. 38° 38.428’ N., Long. 76° 41.642’ W., then running 90° (True) to a point, at or near Lat. 38° 38.428’ N., Long. 76° 41.610’ W., then running 193° (True) to a point, at or near Lat. 38° 38.377’ N., Long. 76° 41.625’ W., then running 270° (True) to a point, at or near Lat. 38° 38.377’ N., Long. 76° 41.657’ W. This area has a 6-knot speed limit all year. These coordinates are approximately 100 feet downriver and 200 feet upriver of the Maryland-National Capital Park and Planning Commission pier, and extend approximately 150 feet from the shoreline.