Potomac The boat ramp into Seneca Creek at Riley's Lock is the the busiest boat ramp in Montgomery County, and on Memorial Day, a steady stream of people with motor boats, jet skis, canoes and kayaks used the ramp to begin their outings on the Potomac River. Corporal Daniel Yankie of the Maryland Natural Resources Police took the early season opportunity to remind boaters about wearing personal floatation devices (PFDs) and other safety measures. He checked registrations and chatted with boaters coming out of the water on Monday evening, May 28, writing a few citations and warnings. Yankie noted that the stretch of the Potomac River in Montgomery County that runs south of Blockhouse Point is the most dangerous area along the river, with the most drownings. The river northwest of Riley's Lock is calm and flat. The resources police also look for boaters who might be impaired from drinking during their excursions on the river. For more information on water trails, the location of boat ramps and boating regulations in Maryland, see http://www.dnr.state.md.us/boating.