Latitude: 38.903361° N,
Longitude: 77.067667° W,
Horizontal Datum:
NAD83
River Stage
Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
6 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 |
-2.26 ft |
3.74 ft |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
| NGVD 29 |
-1.41 ft |
4.59 ft |
Older USGS topographic maps, NGVD29 benchmarks |
| MSL |
Not Available |
Not Available |
Older USGS topographic maps, MSL benchmarks |
| Other |
0 ft |
6 ft |
Washington Mean Low Water as defined by the US Army Corps of Engineers |
|