Latitude: 38.319722° N,
Longitude: 77.036667° W,
Horizontal Datum:
NAD83
River Stage Reference Frame |
Gauge Height |
Flood Stage |
Uses |
NWS stage |
0 ft |
3.5 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 |
-1.02 |
2.48 |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
NGVD 29 |
Not Available |
Not Available |
Older USGS topographic maps, NGVD29 benchmarks |
MSL |
-0.94 |
2.56 |
Older USGS topographic maps, MSL benchmarks |
Other |
Not Available |
3.5 |
MLLW |
|