Metadata for Northwest Branch Patapsco River at Baltimore/Fort McHenry (IN MLLW) (BLTM2)

About This Location

Latitude: 39.270000° N, Longitude: 76.580000° W, Horizontal Datum: NAD83

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 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 -0.84 2.16 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 -0.05 2.95 Older USGS topographic maps, NGVD29 benchmarks
MSL -0.80 2.20 Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

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