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Hydrograph River at a Glance Download Inundation
Washington Channel at SW Waterfront Tide Height (ft)Observed: 0.63 ft at 9:00AM Aug 24, 2016Observed: 0.67 ft at 9:06AM Aug 24, 2016Observed: 0.71 ft at 9:12AM Aug 24, 2016Observed: 0.76 ft at 9:18AM Aug 24, 2016Observed: 0.82 ft at 9:24AM Aug 24, 2016Observed: 0.88 ft at 9:30AM Aug 24, 2016Observed: 0.95 ft at 9:36AM Aug 24, 2016Observed: 1.03 ft at 9:42AM Aug 24, 2016Observed: 1.11 ft at 9:48AM Aug 24, 2016Observed: 1.16 ft at 9:54AM Aug 24, 2016Observed: 1.26 ft at 10:00AM Aug 24, 2016Observed: 1.35 ft at 10:06AM Aug 24, 2016Observed: 1.45 ft at 10:12AM Aug 24, 2016Observed: 1.57 ft at 10:18AM Aug 24, 2016Observed: 1.67 ft at 10:24AM Aug 24, 2016Observed: 1.77 ft at 10:30AM Aug 24, 2016Observed: 1.86 ft at 10:36AM Aug 24, 2016Observed: 1.97 ft at 10:42AM Aug 24, 2016Observed: 2.06 ft at 10:48AM Aug 24, 2016Observed: 2.16 ft at 10:54AM Aug 24, 2016Observed: 2.25 ft at 11:00AM Aug 24, 2016Observed: 2.35 ft at 11:06AM Aug 24, 2016Observed: 2.43 ft at 11:12AM Aug 24, 2016Observed: 2.51 ft at 11:18AM Aug 24, 2016Observed: 2.6 ft at 11:24AM Aug 24, 2016Observed: 2.68 ft at 11:30AM Aug 24, 2016Observed: 2.75 ft at 11:36AM Aug 24, 2016Observed: 2.82 ft at 11:42AM Aug 24, 2016Observed: 2.89 ft at 11:48AM Aug 24, 2016Observed: 2.96 ft at 11:54AM Aug 24, 2016Observed: 3.02 ft at 12:00PM Aug 24, 2016Observed: 3.08 ft at 12:06PM Aug 24, 2016Observed: 3.14 ft at 12:12PM Aug 24, 2016Observed: 3.18 ft at 12:18PM Aug 24, 2016Observed: 3.23 ft at 12:24PM Aug 24, 2016Observed: 3.27 ft at 12:30PM Aug 24, 2016Observed: 3.33 ft at 12:36PM Aug 24, 2016Observed: 3.36 ft at 12:42PM Aug 24, 2016Observed: 3.4 ft at 12:48PM Aug 24, 2016Observed: 3.45 ft at 1:00PM Aug 24, 2016Observed: 3.48 ft at 1:06PM Aug 24, 2016Observed: 3.5 ft at 1:12PM Aug 24, 2016Observed: 3.51 ft at 1:18PM Aug 24, 2016Observed: 3.53 ft at 1:24PM Aug 24, 2016Highest Observation: 3.54 ft at 1:30PM Aug 24, 2016Highest Observation: 3.54 ft at 1:36PM Aug 24, 2016Highest Observation: 3.54 ft at 1:42PM Aug 24, 2016Observed: 3.53 ft at 1:48PM Aug 24, 2016Observed: 3.52 ft at 1:54PM Aug 24, 2016Observed: 3.51 ft at 2:00PM Aug 24, 2016Observed: 3.49 ft at 2:06PM Aug 24, 2016Observed: 3.46 ft at 2:12PM Aug 24, 2016Observed: 3.44 ft at 2:18PM Aug 24, 2016Observed: 3.41 ft at 2:24PM Aug 24, 2016Observed: 3.38 ft at 2:30PM Aug 24, 2016Observed: 3.33 ft at 2:36PM Aug 24, 2016Observed: 3.27 ft at 2:42PM Aug 24, 2016Observed: 3.23 ft at 2:48PM Aug 24, 2016Observed: 3.18 ft at 2:54PM Aug 24, 2016Observed: 3.13 ft at 3:00PM Aug 24, 2016Observed: 3.06 ft at 3:06PM Aug 24, 2016Observed: 3.01 ft at 3:12PM Aug 24, 2016Observed: 2.95 ft at 3:18PM Aug 24, 2016Observed: 2.88 ft at 3:24PM Aug 24, 2016Observed: 2.81 ft at 3:30PM Aug 24, 2016Observed: 2.75 ft at 3:36PM Aug 24, 2016Observed: 2.69 ft at 3:42PM Aug 24, 2016Observed: 2.61 ft at 3:48PM Aug 24, 2016Observed: 2.53 ft at 3:54PM Aug 24, 2016Observed: 2.46 ft at 4:00PM Aug 24, 2016Observed: 2.39 ft at 4:06PM Aug 24, 2016Observed: 2.32 ft at 4:12PM Aug 24, 2016Observed: 2.24 ft at 4:18PM Aug 24, 2016Observed: 2.18 ft at 4:24PM Aug 24, 2016Observed: 2.11 ft at 4:30PM Aug 24, 2016Observed: 2.04 ft at 4:36PM Aug 24, 2016Observed: 1.97 ft at 4:42PM Aug 24, 2016Observed: 1.9 ft at 4:48PM Aug 24, 2016Observed: 1.83 ft at 4:54PM Aug 24, 2016Observed: 1.76 ft at 5:00PM Aug 24, 2016Forecast: 3.12 ft 4:00PM Aug 26, 2016Forecast: 2.85 ft 5:00PM Aug 26, 2016Forecast: 2.39 ft 6:00PM Aug 26, 2016Forecast: 1.77 ft 7:00PM Aug 26, 2016Forecast: 1.12 ft 8:00PM Aug 26, 2016Forecast: 0.52 ft 9:00PM Aug 26, 2016Forecast: 0.16 ft 10:00PM Aug 26, 2016Forecast: 0.03 ft 11:00PM Aug 26, 2016Forecast: 0.26 ft 12:00AM Aug 27, 2016Forecast: 1.05 ft 1:00AM Aug 27, 2016Forecast: 2.17 ft 2:00AM Aug 27, 2016Forecast: 3.05 ft 3:00AM Aug 27, 2016Forecast: 3.41 ft 4:00AM Aug 27, 2016Forecast: 3.44 ft 5:00AM Aug 27, 2016Forecast: 3.12 ft 6:00AM Aug 27, 2016Forecast: 2.49 ft 7:00AM Aug 27, 2016Forecast: 1.77 ft 8:00AM Aug 27, 2016Forecast: 1.12 ft 9:00AM Aug 27, 2016Forecast: 0.72 ft 10:00AM Aug 27, 2016Forecast: 0.46 ft 11:00AM Aug 27, 2016Forecast: 0.3 ft 12:00PM Aug 27, 2016Forecast: 0.52 ft 1:00PM Aug 27, 2016Forecast: 1.31 ft 2:00PM Aug 27, 2016Forecast: 2.39 ft 3:00PM Aug 27, 2016Forecast: 3.22 ft 4:00PM Aug 27, 2016Forecast: 3.44 ft 5:00PM Aug 27, 2016Forecast: 3.28 ft 6:00PM Aug 27, 2016Forecast: 2.79 ft 7:00PM Aug 27, 2016Forecast: 2.17 ft 8:00PM Aug 27, 2016Forecast: 1.51 ft 9:00PM Aug 27, 2016Forecast: 1.05 ft 10:00PM Aug 27, 2016Forecast: 0.82 ft 11:00PM Aug 27, 2016Forecast: 0.66 ft 12:00AM Aug 28, 2016Forecast: 0.79 ft 1:00AM Aug 28, 2016Forecast: 1.48 ft 2:00AM Aug 28, 2016Forecast: 2.49 ft 3:00AM Aug 28, 2016Forecast: 3.44 ft 4:00AM Aug 28, 2016Forecast: 3.94 ft 5:00AM Aug 28, 2016Forecast: 4 ft 6:00AM Aug 28, 2016Forecast: 3.71 ft 7:00AM Aug 28, 2016Forecast: 3.08 ft 8:00AM Aug 28, 2016Forecast: 2.36 ft 9:00AM Aug 28, 2016Forecast: 1.67 ft 10:00AM Aug 28, 2016Forecast: 1.21 ft 11:00AM Aug 28, 2016Forecast: 0.89 ft 12:00PM Aug 28, 2016Forecast: 0.69 ft 1:00PM Aug 28, 2016Forecast: 0.89 ft 2:00PM Aug 28, 2016Forecast: 1.57 ft 3:00PM Aug 28, 2016Forecast: 2.62 ft 4:00PM Aug 28, 2016Forecast: 3.48 ft 5:00PM Aug 28, 2016Forecast: 3.81 ft 6:00PM Aug 28, 2016Forecast: 3.58 ft 7:00PM Aug 28, 2016Forecast: 2.99 ft 8:00PM Aug 28, 2016Forecast: 2.3 ft 9:00PM Aug 28, 2016Forecast: 1.71 ft 10:00PM Aug 28, 2016Forecast: 1.25 ft 11:00PM Aug 28, 2016Forecast: 0.95 ft 12:00AM Aug 29, 2016Forecast: 0.79 ft 1:00AM Aug 29, 2016Forecast: 0.98 ft 2:00AM Aug 29, 2016Forecast: 1.8 ft 3:00AM Aug 29, 2016Forecast: 2.89 ft 4:00AM Aug 29, 2016Forecast: 3.71 ft 5:00AM Aug 29, 2016Forecast: 4.1 ft 6:00AM Aug 29, 2016Highest Forecast: 4.13 ft 7:00AM Aug 29, 2016Forecast: 3.77 ft 8:00AM Aug 29, 2016National Ocean ServiceWASD2(plotting HMIRG) Graph Created (3:54PM Aug 26, 2016)ObservedForecast (issued 10:38AM Aug 26)Latest observed value: 1.76 ft at 5:00 PM EDT 24-Aug-2016. Flood Stage is 4.2 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Caution: This water level forecast does not fully account for the effects of wind driven storm surge. Forecast errors of two feet or more are possible during major surge events. Other sources of error may include rainfall forecast uncertainties and hydrologic/hydraulic model uncertainties.

NOTE: Gauge reading affected by tides.

NOTE: Forecasts for the Washington Channel at SW Waterfront are issued routinely year-round.

Vertical Datum references a tidal datum (MLLW)...for more information see Tides and Currents .

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Downstream Gauge Downstream Gauge - at Alexandria
Flood Categories (in feet)
Major Flood Stage: 7
Moderate Flood Stage: 5.3
Flood Stage: 4.2
Action Stage: 3.7
Low Stage (in feet): 0

Historic Crests
(1) 11.05 ft on 10/17/1942
(2) 10.55 ft on 03/19/1936
(3) 10.26 ft on 09/19/2003
(4) 9.95 ft on 08/23/1933
(5) 8.68 ft on 06/24/1972
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.70 ft on 02/25/2016
(2) 5.38 ft on 02/10/2016
(3) 5.18 ft on 10/29/2015
(4) 5.29 ft on 10/05/2015
(5) 5.41 ft on 10/04/2015
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:14
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
15 Floodwaters approach the Pentagon East parking area, especially during a freshwater flood. Most of the Reagan National Airport runways are flooded. In a tidal flood, water covers portions of the economy parking at Reagan National Airport, and approaches nearby structures. Water approaches Arnold Avenue at Joint Base Anacostia Bolling. A tidal flood at this height could cause even more widespread flooding of the Base. Most of Fort McNair is flooded.
12 Widespread flooding is occurring. Only a few high spots remain dry in East Potomac Park, and around the tidal basin. Floodwaters on Fort McNair go all the way up 5th Avenue. Near the Navy Yard, floodwaters cover past M Street SE. Some runways and taxiways at Reagan National Airport are partially flooded.
11 Floodwaters reach both ends of the north-south runway at Reagan National Airport, and covers some taxiways. The George Washington Parkway is flooded in multiple locations between Arlington National Cemetery and the Airport. Floodwaters approach the back side of a business on the north side of Maine Avenue near I-395. Also, widespread flooding is occurring on the Anacostia, with water on the Navy Yard up to M Street SE.
10 Water approaches the southern end of the runways at Reagan National Airport. This is more likely to occur in a tidal flood at this level. Almost all of East Potomac Park is flooded, along with the western half of the Navy Yard. 5th Avenue SW is flooded up to C Street on Fort McNair. Floodwaters threaten the basement of the Jefferson Memorial.
9 Most of East Potomac Park is flooded, including some buildings. Water approaches the World War II Memorial on 17th Street NW. Moderate flooding is occurring on the Anacostia River with roads and buildings impacted. Water approaches the FDR Memorial. Substantial inundation of a portion of the Navy Yard begins, and water approaches taxiways at Reagan National Airport. Maine Avenue begins to flood near the 14th Street bridge.
8.4 Floodwaters cover Ohio Drive on the Potomac side at the railroad bridge.
7.5 Water approaches portions of the George Washington Memorial Parkway near the 14th Street bridge.
7 Water reaches the parking area of the East Potomac Golf Course. In a freshwater flood, water is overflowing the tidal basin at Independence and 17th, and on East Basin Drive near the Jefferson Memorial.
6.5 A significant portion of East Potomac Park is flooded, including parts of the Hains Point Loop Road. The road will be closed. The western end of the DC seafood market on the Southwest Waterfront is flooded. A portion of the Navy Yard begins to flood as minor inundation begins along the Anacostia River.
5.3 The unprotected area on the Southwest Waterfront at the DC seafood market begins to flood. Water approaches parts of the Hains Point Loop Road, but the road will likely be closed.
4.2 Lowland flooding is occurring along sporadic portions of the seawall adjacent to Ohio Drive and the Hains Point Loop Road.
3.7 Water begins to overflow the lowest spots along the seawall adjacent to Ohio Drive and the Hains Point Loop Road.
About This Location Collapse

Latitude: 38.873333° N, Longitude: 77.021111° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 4.2 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 -1.40 2.8 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 -0.62 3.58 Older USGS topographic maps, NGVD29 benchmarks
MSL -1.55 2.65 Older USGS topographic maps, MSL benchmarks
Other Not Available 4.2 MLLW (Mean Lower Low Water)
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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.
NWS Information
National Weather Service
(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(703) 996-2200
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Page last modified: 13-Aug-2015 1:57 AM
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