Metadata for Potomac River at Alexandria (AXTV2)

About This Location

Latitude: 38.805278° N, Longitude: 77.038333° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 3.3 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 0.00 3.10 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 0.75 3.85 Older USGS topographic maps, NGVD29 benchmarks
MSL -0.18 2.92 Older USGS topographic maps, MSL benchmarks
Other 1.40 4.50  

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

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