Latitude: 38.220000° N,
Longitude: 76.038333° W,
Horizontal Datum:
NAD83
River Stage Reference Frame |
Gauge Height |
Flood Stage |
Uses |
NWS stage |
0 ft |
3.2 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 |
-1.25 |
2.0 |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
NGVD 29 |
-0.50 |
2.75 |
Older USGS topographic maps, NGVD29 benchmarks |
MSL |
-1.01 |
2.24 |
Older USGS topographic maps, MSL benchmarks |
Other |
Not Available |
Not Available |
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