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Hydrograph River at a Glance Download
Patapsco River at Ellicott City Stage (ft)Observed: 114.82 ft at 2:50AM Apr 20, 2024Observed: 114.83 ft at 3:50AM Apr 20, 2024Observed: 114.83 ft at 4:50AM Apr 20, 2024Observed: 114.84 ft at 5:50AM Apr 20, 2024Observed: 114.84 ft at 6:50AM Apr 20, 2024Observed: 114.84 ft at 7:50AM Apr 20, 2024Observed: 114.84 ft at 8:50AM Apr 20, 2024Observed: 114.84 ft at 9:50AM Apr 20, 2024Observed: 114.84 ft at 10:50AM Apr 20, 2024Observed: 114.84 ft at 11:50AM Apr 20, 2024Observed: 114.84 ft at 12:50PM Apr 20, 2024Observed: 114.84 ft at 1:50PM Apr 20, 2024Observed: 114.84 ft at 2:50PM Apr 20, 2024Observed: 114.84 ft at 3:50PM Apr 20, 2024Observed: 114.84 ft at 4:50PM Apr 20, 2024Observed: 114.84 ft at 5:50PM Apr 20, 2024Highest Observation: 114.85 ft at 6:50PM Apr 20, 2024Highest Observation: 114.85 ft at 7:50PM Apr 20, 2024Highest Observation: 114.85 ft at 8:50PM Apr 20, 2024Highest Observation: 114.85 ft at 9:50PM Apr 20, 2024Highest Observation: 114.85 ft at 10:50PM Apr 20, 2024Observed: 114.84 ft at 11:50PM Apr 20, 2024Observed: 114.84 ft at 12:50AM Apr 21, 2024Observed: 114.83 ft at 1:50AM Apr 21, 2024Observed: 114.84 ft at 3:50AM Apr 21, 2024Observed: 114.83 ft at 4:50AM Apr 21, 2024Observed: 114.83 ft at 5:50AM Apr 21, 2024Observed: 114.83 ft at 6:50AM Apr 21, 2024Observed: 114.81 ft at 8:50AM Apr 21, 2024Observed: 114.79 ft at 9:50AM Apr 21, 2024Observed: 114.78 ft at 10:50AM Apr 21, 2024Observed: 114.78 ft at 11:50AM Apr 21, 2024Observed: 114.77 ft at 12:50PM Apr 21, 2024Observed: 114.77 ft at 1:50PM Apr 21, 2024Observed: 114.76 ft at 2:50PM Apr 21, 2024Observed: 114.76 ft at 3:50PM Apr 21, 2024Observed: 114.76 ft at 4:50PM Apr 21, 2024Observed: 114.76 ft at 5:50PM Apr 21, 2024Observed: 114.76 ft at 6:50PM Apr 21, 2024Observed: 114.76 ft at 7:50PM Apr 21, 2024Observed: 114.76 ft at 8:50PM Apr 21, 2024Observed: 114.76 ft at 9:50PM Apr 21, 2024Observed: 114.77 ft at 10:50PM Apr 21, 2024Observed: 114.77 ft at 11:50PM Apr 21, 2024Observed: 114.78 ft at 1:50AM Apr 22, 2024Observed: 114.78 ft at 2:50AM Apr 22, 2024Observed: 114.77 ft at 3:50AM Apr 22, 2024Observed: 114.76 ft at 4:50AM Apr 22, 2024Observed: 114.75 ft at 5:50AM Apr 22, 2024Observed: 114.75 ft at 6:50AM Apr 22, 2024Observed: 114.75 ft at 7:50AM Apr 22, 2024Observed: 114.75 ft at 8:50AM Apr 22, 2024Observed: 114.75 ft at 9:50AM Apr 22, 2024Observed: 114.74 ft at 10:50AM Apr 22, 2024Observed: 114.74 ft at 11:50AM Apr 22, 2024Observed: 114.74 ft at 12:50PM Apr 22, 2024Observed: 114.74 ft at 1:50PM Apr 22, 2024Observed: 114.74 ft at 2:50PM Apr 22, 2024Observed: 114.74 ft at 3:50PM Apr 22, 2024Observed: 114.74 ft at 4:50PM Apr 22, 2024Observed: 114.75 ft at 5:50PM Apr 22, 2024Observed: 114.74 ft at 6:50PM Apr 22, 2024Observed: 114.74 ft at 7:50PM Apr 22, 2024Observed: 114.74 ft at 8:50PM Apr 22, 2024Observed: 114.73 ft at 9:50PM Apr 22, 2024Observed: 114.73 ft at 10:50PM Apr 22, 2024Observed: 114.72 ft at 11:50PM Apr 22, 2024Observed: 114.72 ft at 12:50AM Apr 23, 2024Observed: 114.71 ft at 1:50AM Apr 23, 2024Observed: 114.71 ft at 2:50AM Apr 23, 2024Observed: 114.7 ft at 3:50AM Apr 23, 2024Observed: 114.7 ft at 4:50AM Apr 23, 2024Observed: 114.69 ft at 5:50AM Apr 23, 2024Observed: 114.69 ft at 6:50AM Apr 23, 2024Observed: 114.69 ft at 7:50AM Apr 23, 2024Observed: 114.69 ft at 8:50AM Apr 23, 2024Observed: 114.69 ft at 9:50AM Apr 23, 2024Observed: 114.69 ft at 10:50AM Apr 23, 2024Observed: 114.69 ft at 11:50AM Apr 23, 2024Observed: 114.69 ft at 12:50PM Apr 23, 2024Observed: 114.7 ft at 1:50PM Apr 23, 2024Observed: 114.69 ft at 2:50PM Apr 23, 2024Observed: 114.69 ft at 3:50PM Apr 23, 2024Observed: 114.68 ft at 4:50PM Apr 23, 2024Observed: 114.69 ft at 5:50PM Apr 23, 2024Observed: 114.69 ft at 6:50PM Apr 23, 2024Observed: 114.68 ft at 7:50PM Apr 23, 2024Observed: 114.68 ft at 8:50PM Apr 23, 2024Observed: 114.68 ft at 9:50PM Apr 23, 2024Observed: 114.68 ft at 10:50PM Apr 23, 2024Observed: 114.67 ft at 11:50PM Apr 23, 2024Observed: 114.67 ft at 12:50AM Apr 24, 2024Observed: 114.66 ft at 1:50AM Apr 24, 2024Observed: 114.66 ft at 2:50AM Apr 24, 2024Observed: 114.65 ft at 3:50AM Apr 24, 2024Observed: 114.65 ft at 4:50AM Apr 24, 2024Observed: 114.65 ft at 5:50AM Apr 24, 2024Observed: 114.65 ft at 6:50AM Apr 24, 2024Observed: 114.65 ft at 7:50AM Apr 24, 2024Observed: 114.65 ft at 8:50AM Apr 24, 2024Observed: 114.65 ft at 9:50AM Apr 24, 2024Observed: 114.65 ft at 10:50AM Apr 24, 2024Observed: 114.65 ft at 11:50AM Apr 24, 2024Observed: 114.65 ft at 12:50PM Apr 24, 2024Observed: 114.65 ft at 1:50PM Apr 24, 2024Observed: 114.65 ft at 2:50PM Apr 24, 2024Observed: 114.65 ft at 3:50PM Apr 24, 2024Observed: 114.66 ft at 4:50PM Apr 24, 2024Observed: 114.68 ft at 6:50PM Apr 24, 2024Observed: 114.68 ft at 7:50PM Apr 24, 2024Observed: 114.68 ft at 8:50PM Apr 24, 2024Observed: 114.68 ft at 9:50PM Apr 24, 2024Observed: 114.68 ft at 10:50PM Apr 24, 2024Observed: 114.69 ft at 11:50PM Apr 24, 2024Observed: 114.69 ft at 12:50AM Apr 25, 2024Observed: 114.68 ft at 1:50AM Apr 25, 2024ELPM2(plotting HGIRR) Graph Created (2:41AM Apr 25, 2024)ObservedLatest observed value: 114.68 ft at 1:50 AM EDT 25-Apr-2024. Flood Stage is 122.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Patapsco River at Ellicott City. Only observed stages are available for this point.
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Upstream Gauge - at Hollofield Upstream Gauge Downstream Gauge Downstream Gauge - near Catonsville
Flood Categories (in feet)
Major Flood Stage: 127
Moderate Flood Stage: 125
Flood Stage: 122.5
Action Stage: 121.5
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:15
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Gauge LocationGauge Map Marker
 Disclaimer
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
127 Major flooding is occurring in lower Old Town Ellicott City. The flooding will be even more significant if local rainfall has occurred, causing additional backwater flooding.
125 Main Street in Ellicott City is flooded near the railroad bridge with water either approaching or entering buildings. Backwater flooding may be occurring further upstream if local rainfall has occurred.
124 Main Street in Ellicott City begins to flood both near 8000 Main Street and near the intersection of Main Street and Maryland Avenue.
122 Water exceeds the banks and approaches an access road adjacent to 8000 Main Street in Ellicott City.
About This Location Collapse

Latitude: 39.268333° N, Longitude: 76.793889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 122.5 ft  
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available  
NGVD 29 Not Available Not Available  
MSL Not Available Not Available  
Other Not Available Not Available  
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Collaborative Agencies Collapse
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
(571) 888-3500
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