8594900_waterlevel_1min11CO-OPS station 8594900: WASHINGTON, POTOMAC RIVER 1-minute Raw Tsunami Water Level Data (ID: boundingGeographicBoundingBox) Coastal Tide Gauge Network of the United States and Its Territories at E: -77.02166, W: -77.02166, N: 38.87332, S: 38.87332#footprint-77.02166,38.87332 -77.02166,38.87332 -77.02166,38.87332 -77.02166,38.87332 -77.02166,38.87332