Metadata for Washington Channel at SW Waterfront (IN MLLW) (WASD2)

About This Location

Latitude: 38.873333° N, Longitude: 77.021111° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 4.2 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 -1.40 2.8 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 -0.62 3.58 Older USGS topographic maps, NGVD29 benchmarks
MSL -1.55 2.65 Older USGS topographic maps, MSL benchmarks
Other Not Available 4.2 MLLW (Mean Lower Low Water)

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