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| 12.0 |
water will begin to inundate the C&O towpath, along the Maryland side of the river. Downstream in the District of Columbia at Wisconsin Avenue, the tidal potomac river will near its 7 foot flood stage at time of high tide. |
| 10.0 |
the river will begin to overflow into low lying areas on the Maryland side of the river with several boat houses downstream beginning to flood. |
| 7.0 |
the river begins to inundate Whites Ferry upstream in Montgomery county Maryland.. |
| 5.0 |
the river is at hazardous levels for recreational use. |
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Latitude: 38.949400° N,
Longitude: 77.127800° W,
Horizontal Datum:
NAD83
River Stage
Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
10 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 |
N/A |
N/A |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
| NGVD 29 |
37.95 ft |
47.95 ft |
Older USGS topographic maps, NGVD29 benchmarks |
| MSL |
N/A |
N/A |
Older USGS topographic maps, MSL benchmarks |
| Other |
N/A |
N/A |
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Hydrologic Resources
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Additional Resources
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here. |
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NWS Information |
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weather.gov 
