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Hydrograph River at a Glance Download
Patapsco River at Ellicott City Stage (ft)Highest Observation: 114.96 ft at 2:35PM May 24, 2020Highest Observation: 114.96 ft at 3:35PM May 24, 2020Highest Observation: 114.96 ft at 4:35PM May 24, 2020Highest Observation: 114.96 ft at 5:35PM May 24, 2020Highest Observation: 114.96 ft at 6:35PM May 24, 2020Highest Observation: 114.96 ft at 7:35PM May 24, 2020Observed: 114.95 ft at 8:35PM May 24, 2020Highest Observation: 114.96 ft at 9:35PM May 24, 2020Observed: 114.95 ft at 10:35PM May 24, 2020Observed: 114.95 ft at 11:35PM May 24, 2020Observed: 114.94 ft at 12:35AM May 25, 2020Observed: 114.94 ft at 1:35AM May 25, 2020Observed: 114.93 ft at 2:35AM May 25, 2020Observed: 114.94 ft at 3:35AM May 25, 2020Observed: 114.94 ft at 4:35AM May 25, 2020Observed: 114.94 ft at 5:35AM May 25, 2020Observed: 114.93 ft at 6:35AM May 25, 2020Observed: 114.94 ft at 7:35AM May 25, 2020Observed: 114.93 ft at 8:35AM May 25, 2020Observed: 114.93 ft at 9:35AM May 25, 2020Observed: 114.93 ft at 10:35AM May 25, 2020Observed: 114.92 ft at 11:35AM May 25, 2020Observed: 114.92 ft at 12:35PM May 25, 2020Observed: 114.92 ft at 1:35PM May 25, 2020Observed: 114.92 ft at 2:35PM May 25, 2020Observed: 114.91 ft at 3:35PM May 25, 2020Observed: 114.92 ft at 4:35PM May 25, 2020Observed: 114.91 ft at 5:35PM May 25, 2020Observed: 114.91 ft at 6:35PM May 25, 2020Observed: 114.9 ft at 7:35PM May 25, 2020Observed: 114.91 ft at 8:35PM May 25, 2020Observed: 114.9 ft at 9:35PM May 25, 2020Observed: 114.9 ft at 10:35PM May 25, 2020Observed: 114.89 ft at 11:35PM May 25, 2020Observed: 114.89 ft at 12:35AM May 26, 2020Observed: 114.88 ft at 1:35AM May 26, 2020Observed: 114.87 ft at 2:35AM May 26, 2020Observed: 114.88 ft at 3:35AM May 26, 2020Observed: 114.87 ft at 4:35AM May 26, 2020Observed: 114.87 ft at 5:35AM May 26, 2020Observed: 114.87 ft at 6:35AM May 26, 2020Observed: 114.86 ft at 7:35AM May 26, 2020Observed: 114.86 ft at 8:35AM May 26, 2020Observed: 114.85 ft at 9:35AM May 26, 2020Observed: 114.86 ft at 10:35AM May 26, 2020Observed: 114.86 ft at 11:35AM May 26, 2020Observed: 114.86 ft at 12:35PM May 26, 2020Observed: 114.85 ft at 1:35PM May 26, 2020Observed: 114.85 ft at 2:35PM May 26, 2020Observed: 114.85 ft at 3:35PM May 26, 2020Observed: 114.84 ft at 4:35PM May 26, 2020Observed: 114.85 ft at 5:35PM May 26, 2020Observed: 114.84 ft at 6:35PM May 26, 2020Observed: 114.84 ft at 7:35PM May 26, 2020Observed: 114.84 ft at 8:35PM May 26, 2020Observed: 114.84 ft at 9:35PM May 26, 2020Observed: 114.83 ft at 10:35PM May 26, 2020Observed: 114.83 ft at 11:35PM May 26, 2020Observed: 114.83 ft at 12:35AM May 27, 2020Observed: 114.82 ft at 1:35AM May 27, 2020Observed: 114.82 ft at 2:35AM May 27, 2020Observed: 114.81 ft at 3:35AM May 27, 2020Observed: 114.81 ft at 4:35AM May 27, 2020Observed: 114.81 ft at 5:35AM May 27, 2020Observed: 114.8 ft at 6:35AM May 27, 2020Observed: 114.8 ft at 7:35AM May 27, 2020Observed: 114.8 ft at 8:35AM May 27, 2020Observed: 114.8 ft at 9:35AM May 27, 2020Observed: 114.79 ft at 10:35AM May 27, 2020Observed: 114.79 ft at 11:35AM May 27, 2020Observed: 114.79 ft at 12:35PM May 27, 2020Observed: 114.79 ft at 1:35PM May 27, 2020Observed: 114.79 ft at 2:35PM May 27, 2020Observed: 114.79 ft at 3:35PM May 27, 2020Observed: 114.79 ft at 4:35PM May 27, 2020Observed: 114.78 ft at 5:35PM May 27, 2020Observed: 114.78 ft at 6:35PM May 27, 2020Observed: 114.78 ft at 7:35PM May 27, 2020Observed: 114.78 ft at 8:35PM May 27, 2020Observed: 114.78 ft at 9:35PM May 27, 2020Observed: 114.77 ft at 10:35PM May 27, 2020Observed: 114.77 ft at 11:35PM May 27, 2020Observed: 114.76 ft at 12:35AM May 28, 2020Observed: 114.76 ft at 1:35AM May 28, 2020Observed: 114.76 ft at 2:35AM May 28, 2020Observed: 114.76 ft at 3:35AM May 28, 2020Observed: 114.78 ft at 4:35AM May 28, 2020Observed: 114.77 ft at 5:35AM May 28, 2020Observed: 114.79 ft at 6:35AM May 28, 2020Observed: 114.8 ft at 7:35AM May 28, 2020Observed: 114.8 ft at 8:35AM May 28, 2020Observed: 114.79 ft at 9:35AM May 28, 2020Observed: 114.8 ft at 10:35AM May 28, 2020Observed: 114.8 ft at 11:35AM May 28, 2020Observed: 114.82 ft at 12:35PM May 28, 2020Observed: 114.83 ft at 1:35PM May 28, 2020Observed: 114.83 ft at 2:35PM May 28, 2020Observed: 114.85 ft at 3:35PM May 28, 2020Observed: 114.89 ft at 4:35PM May 28, 2020Observed: 114.91 ft at 5:35PM May 28, 2020Observed: 114.9 ft at 6:35PM May 28, 2020Observed: 114.89 ft at 7:35PM May 28, 2020Observed: 114.9 ft at 8:35PM May 28, 2020Observed: 114.9 ft at 9:35PM May 28, 2020Observed: 114.89 ft at 10:35PM May 28, 2020Observed: 114.88 ft at 11:35PM May 28, 2020Observed: 114.88 ft at 12:35AM May 29, 2020Observed: 114.87 ft at 1:35AM May 29, 2020Observed: 114.87 ft at 2:35AM May 29, 2020Observed: 114.87 ft at 3:35AM May 29, 2020Observed: 114.87 ft at 4:35AM May 29, 2020Observed: 114.86 ft at 5:35AM May 29, 2020Observed: 114.86 ft at 6:35AM May 29, 2020Observed: 114.86 ft at 7:35AM May 29, 2020Observed: 114.86 ft at 8:35AM May 29, 2020Observed: 114.86 ft at 9:35AM May 29, 2020Observed: 114.86 ft at 10:35AM May 29, 2020Observed: 114.85 ft at 11:35AM May 29, 2020Observed: 114.85 ft at 12:35PM May 29, 2020ELPM2(plotting HGIRR) Graph Created (1:40PM May 29, 2020)ObservedLatest observed value: 114.85 ft at 12:35 PM EDT 29-May-2020. 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.

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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
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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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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: 1-Mar-2019 12:35 AM
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