Metadata for Potomac River at Georgetown / Wisconsin Ave (GTND2)

About This Location

Latitude: 38.902222° N, Longitude: 77.063056° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 6 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 -2.26 ft 3.74 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 -1.41 ft 4.59 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 0 ft 6 ft Washington Mean Low Water as defined by the US Army Corps of Engineers

Other Real-time and/or Archive Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Georgetown / Wisconsin Ave

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