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ALERT: December 5th update on the status of the nationwide data transmission error preventing stream gauge data collected at affected locations from being displayed on the Advanced Hydrologic Prediction Services (AHPS) webpages. As of 11/08/2018, The USGS has restored all impacted operational stream gauges to transmitting status. The status map of gauge outages from other agencies is here. The outage map will be updated each Thursday. We apologize for the service interruption and hope to have the data restored as soon as possible.



Hydrograph River at a Glance Download
Susquehanna River at Conowingo Dam Stage (ft)Flow (kcfs)Highest Observation: 17.39 ft at 2:30PM Dec 07, 2018Observed: 17.03 ft at 2:45PM Dec 07, 2018Observed: 16.87 ft at 3:00PM Dec 07, 2018Observed: 16.82 ft at 3:15PM Dec 07, 2018Observed: 16.79 ft at 3:30PM Dec 07, 2018Observed: 16.79 ft at 3:45PM Dec 07, 2018Observed: 16.77 ft at 4:00PM Dec 07, 2018Observed: 16.79 ft at 4:15PM Dec 07, 2018Observed: 16.79 ft at 4:30PM Dec 07, 2018Observed: 16.79 ft at 4:45PM Dec 07, 2018Observed: 16.78 ft at 5:00PM Dec 07, 2018Observed: 16.79 ft at 5:15PM Dec 07, 2018Observed: 16.8 ft at 5:30PM Dec 07, 2018Observed: 16.79 ft at 5:45PM Dec 07, 2018Observed: 16.79 ft at 6:00PM Dec 07, 2018Observed: 16.79 ft at 6:15PM Dec 07, 2018Observed: 16.78 ft at 6:30PM Dec 07, 2018Observed: 16.78 ft at 6:45PM Dec 07, 2018Observed: 16.79 ft at 7:00PM Dec 07, 2018Observed: 16.79 ft at 7:15PM Dec 07, 2018Observed: 16.79 ft at 7:30PM Dec 07, 2018Observed: 16.79 ft at 7:45PM Dec 07, 2018Observed: 16.82 ft at 8:00PM Dec 07, 2018Observed: 16.82 ft at 8:15PM Dec 07, 2018Observed: 16.82 ft at 8:30PM Dec 07, 2018Observed: 16.83 ft at 8:45PM Dec 07, 2018Observed: 16.84 ft at 9:00PM Dec 07, 2018Observed: 16.84 ft at 9:15PM Dec 07, 2018Observed: 16.84 ft at 9:30PM Dec 07, 2018Observed: 16.84 ft at 9:45PM Dec 07, 2018Observed: 16.83 ft at 10:00PM Dec 07, 2018Observed: 16.84 ft at 10:15PM Dec 07, 2018Observed: 16.85 ft at 10:30PM Dec 07, 2018Observed: 16.83 ft at 10:45PM Dec 07, 2018Observed: 16.83 ft at 11:00PM Dec 07, 2018Observed: 16.85 ft at 11:15PM Dec 07, 2018Observed: 16.83 ft at 11:30PM Dec 07, 2018Observed: 16.83 ft at 11:45PM Dec 07, 2018Observed: 16.83 ft at 12:00AM Dec 08, 2018Observed: 16.83 ft at 12:15AM Dec 08, 2018Observed: 16.81 ft at 12:30AM Dec 08, 2018Observed: 16.8 ft at 12:45AM Dec 08, 2018Observed: 16.82 ft at 1:00AM Dec 08, 2018Observed: 16.67 ft at 1:15AM Dec 08, 2018Observed: 16.35 ft at 1:30AM Dec 08, 2018Observed: 16.24 ft at 1:45AM Dec 08, 2018Observed: 16.22 ft at 2:00AM Dec 08, 2018Observed: 16.19 ft at 2:15AM Dec 08, 2018Observed: 16.19 ft at 2:30AM Dec 08, 2018Observed: 16.2 ft at 2:45AM Dec 08, 2018Observed: 16.19 ft at 3:00AM Dec 08, 2018Observed: 16.19 ft at 3:15AM Dec 08, 2018Observed: 16.19 ft at 3:30AM Dec 08, 2018Observed: 16.18 ft at 3:45AM Dec 08, 2018Observed: 16.18 ft at 4:00AM Dec 08, 2018Observed: 16.18 ft at 4:15AM Dec 08, 2018Observed: 16.19 ft at 4:30AM Dec 08, 2018Observed: 16.19 ft at 4:45AM Dec 08, 2018Observed: 16.19 ft at 5:00AM Dec 08, 2018Observed: 16.19 ft at 5:15AM Dec 08, 2018Observed: 16.18 ft at 5:30AM Dec 08, 2018Observed: 16.19 ft at 5:45AM Dec 08, 2018Observed: 16.18 ft at 6:00AM Dec 08, 2018Observed: 16.19 ft at 6:15AM Dec 08, 2018Observed: 16.19 ft at 6:30AM Dec 08, 2018Observed: 16.18 ft at 6:45AM Dec 08, 2018Observed: 16.18 ft at 7:00AM Dec 08, 2018Observed: 16.18 ft at 7:15AM Dec 08, 2018Observed: 16.18 ft at 7:30AM Dec 08, 2018Observed: 16.18 ft at 7:45AM Dec 08, 2018Observed: 16.19 ft at 8:00AM Dec 08, 2018Observed: 16.18 ft at 8:15AM Dec 08, 2018Observed: 16.18 ft at 8:30AM Dec 08, 2018Observed: 16.19 ft at 8:45AM Dec 08, 2018Observed: 16.18 ft at 9:00AM Dec 08, 2018Observed: 16.16 ft at 9:15AM Dec 08, 2018Observed: 16.17 ft at 9:30AM Dec 08, 2018Observed: 16.18 ft at 9:45AM Dec 08, 2018Observed: 16.17 ft at 10:00AM Dec 08, 2018Observed: 16.17 ft at 10:15AM Dec 08, 2018Observed: 16.19 ft at 10:30AM Dec 08, 2018Observed: 16.18 ft at 10:45AM Dec 08, 2018Observed: 16.19 ft at 11:00AM Dec 08, 2018Observed: 16.16 ft at 11:15AM Dec 08, 2018Observed: 16.18 ft at 11:30AM Dec 08, 2018Observed: 16.17 ft at 11:45AM Dec 08, 2018Observed: 16.17 ft at 12:00PM Dec 08, 2018Observed: 16.18 ft at 12:15PM Dec 08, 2018Observed: 16.18 ft at 12:30PM Dec 08, 2018Observed: 16.16 ft at 12:45PM Dec 08, 2018Observed: 16.18 ft at 1:00PM Dec 08, 2018Observed: 16.17 ft at 1:15PM Dec 08, 2018Observed: 16.18 ft at 1:30PM Dec 08, 2018Observed: 16.17 ft at 1:45PM Dec 08, 2018Observed: 16.17 ft at 2:00PM Dec 08, 2018Observed: 16.17 ft at 2:15PM Dec 08, 2018Observed: 16.17 ft at 2:30PM Dec 08, 2018Observed: 16.18 ft at 2:45PM Dec 08, 2018Observed: 16.18 ft at 3:00PM Dec 08, 2018Observed: 16.18 ft at 3:15PM Dec 08, 2018Observed: 16.17 ft at 3:30PM Dec 08, 2018Observed: 16.19 ft at 3:45PM Dec 08, 2018Observed: 16.19 ft at 4:00PM Dec 08, 2018Observed: 16.17 ft at 4:15PM Dec 08, 2018Observed: 16.17 ft at 4:30PM Dec 08, 2018Observed: 16.15 ft at 4:45PM Dec 08, 2018Observed: 16.17 ft at 5:00PM Dec 08, 2018Observed: 16.17 ft at 5:15PM Dec 08, 2018Observed: 16.18 ft at 5:30PM Dec 08, 2018Observed: 16.18 ft at 5:45PM Dec 08, 2018Observed: 16.17 ft at 6:00PM Dec 08, 2018Observed: 16.17 ft at 6:15PM Dec 08, 2018Observed: 16.19 ft at 6:30PM Dec 08, 2018Observed: 16.18 ft at 6:45PM Dec 08, 2018Observed: 16.18 ft at 7:00PM Dec 08, 2018Observed: 16.17 ft at 7:15PM Dec 08, 2018Observed: 16.19 ft at 7:30PM Dec 08, 2018Observed: 16.18 ft at 7:45PM Dec 08, 2018Observed: 16.19 ft at 8:00PM Dec 08, 2018Observed: 16.17 ft at 8:15PM Dec 08, 2018Observed: 16.18 ft at 8:30PM Dec 08, 2018Observed: 16.18 ft at 8:45PM Dec 08, 2018Observed: 16.17 ft at 9:00PM Dec 08, 2018Observed: 16.16 ft at 9:15PM Dec 08, 2018Observed: 16.17 ft at 9:30PM Dec 08, 2018Observed: 16.17 ft at 9:45PM Dec 08, 2018Observed: 16.17 ft at 10:00PM Dec 08, 2018Observed: 16.17 ft at 10:15PM Dec 08, 2018Observed: 16.18 ft at 10:30PM Dec 08, 2018Observed: 16.18 ft at 10:45PM Dec 08, 2018Observed: 16.19 ft at 11:00PM Dec 08, 2018Observed: 16.17 ft at 11:15PM Dec 08, 2018Observed: 16.16 ft at 11:30PM Dec 08, 2018Observed: 16.16 ft at 11:45PM Dec 08, 2018Observed: 16.17 ft at 12:00AM Dec 09, 2018Observed: 16.16 ft at 12:15AM Dec 09, 2018Observed: 16.17 ft at 12:30AM Dec 09, 2018Observed: 15.96 ft at 12:45AM Dec 09, 2018Observed: 15.39 ft at 1:00AM Dec 09, 2018Observed: 15.03 ft at 1:15AM Dec 09, 2018Observed: 14.91 ft at 1:30AM Dec 09, 2018Observed: 14.88 ft at 1:45AM Dec 09, 2018Observed: 14.86 ft at 2:00AM Dec 09, 2018Observed: 14.86 ft at 2:15AM Dec 09, 2018Observed: 14.86 ft at 2:30AM Dec 09, 2018Observed: 14.86 ft at 2:45AM Dec 09, 2018Observed: 14.86 ft at 3:00AM Dec 09, 2018Observed: 14.85 ft at 3:15AM Dec 09, 2018Observed: 14.85 ft at 3:30AM Dec 09, 2018Observed: 14.84 ft at 3:45AM Dec 09, 2018Observed: 14.84 ft at 4:00AM Dec 09, 2018Observed: 14.86 ft at 4:15AM Dec 09, 2018Observed: 14.85 ft at 4:30AM Dec 09, 2018Observed: 14.86 ft at 4:45AM Dec 09, 2018Observed: 14.84 ft at 5:00AM Dec 09, 2018Observed: 14.86 ft at 5:15AM Dec 09, 2018Observed: 14.84 ft at 5:30AM Dec 09, 2018Observed: 14.84 ft at 5:45AM Dec 09, 2018Observed: 14.85 ft at 6:00AM Dec 09, 2018Observed: 15.42 ft at 6:15AM Dec 09, 2018Observed: 15.83 ft at 6:30AM Dec 09, 2018Observed: 15.98 ft at 6:45AM Dec 09, 2018Observed: 16.02 ft at 7:00AM Dec 09, 2018Observed: 16.03 ft at 7:15AM Dec 09, 2018Observed: 16.06 ft at 7:30AM Dec 09, 2018Observed: 16.05 ft at 7:45AM Dec 09, 2018Observed: 16.03 ft at 8:00AM Dec 09, 2018Observed: 16.04 ft at 8:15AM Dec 09, 2018Observed: 16.04 ft at 8:30AM Dec 09, 2018Observed: 16.06 ft at 8:45AM Dec 09, 2018Observed: 16.04 ft at 9:00AM Dec 09, 2018Observed: 16.05 ft at 9:15AM Dec 09, 2018Observed: 16.04 ft at 9:30AM Dec 09, 2018Observed: 16.04 ft at 9:45AM Dec 09, 2018Observed: 16.03 ft at 10:00AM Dec 09, 2018Observed: 16.05 ft at 10:15AM Dec 09, 2018Observed: 16.04 ft at 10:30AM Dec 09, 2018Observed: 16.04 ft at 10:45AM Dec 09, 2018Observed: 16.04 ft at 11:00AM Dec 09, 2018Observed: 16.04 ft at 11:15AM Dec 09, 2018Observed: 16.05 ft at 11:30AM Dec 09, 2018Observed: 16.04 ft at 11:45AM Dec 09, 2018Observed: 16.04 ft at 12:00PM Dec 09, 2018Observed: 16.04 ft at 12:15PM Dec 09, 2018Observed: 16.03 ft at 12:30PM Dec 09, 2018Observed: 16.04 ft at 12:45PM Dec 09, 2018Observed: 16.03 ft at 1:00PM Dec 09, 2018Observed: 16.05 ft at 1:15PM Dec 09, 2018Observed: 16.04 ft at 1:30PM Dec 09, 2018Observed: 16.06 ft at 1:45PM Dec 09, 2018Observed: 16.03 ft at 2:00PM Dec 09, 2018Observed: 16.04 ft at 2:15PM Dec 09, 2018Observed: 16.04 ft at 2:30PM Dec 09, 2018Observed: 16.03 ft at 2:45PM Dec 09, 2018Observed: 16.04 ft at 3:00PM Dec 09, 2018Observed: 16.05 ft at 3:15PM Dec 09, 2018Observed: 16.03 ft at 3:30PM Dec 09, 2018Observed: 16.05 ft at 3:45PM Dec 09, 2018Observed: 16.05 ft at 4:00PM Dec 09, 2018Observed: 16.03 ft at 4:15PM Dec 09, 2018Observed: 16.05 ft at 4:30PM Dec 09, 2018Observed: 16.03 ft at 4:45PM Dec 09, 2018Observed: 16.04 ft at 5:00PM Dec 09, 2018Observed: 16.03 ft at 5:15PM Dec 09, 2018Observed: 16.05 ft at 5:30PM Dec 09, 2018Observed: 16.04 ft at 5:45PM Dec 09, 2018Observed: 16.05 ft at 6:00PM Dec 09, 2018Observed: 16.04 ft at 6:15PM Dec 09, 2018Observed: 16.05 ft at 6:30PM Dec 09, 2018Observed: 16.04 ft at 6:45PM Dec 09, 2018Observed: 16.05 ft at 7:00PM Dec 09, 2018Observed: 16.06 ft at 7:15PM Dec 09, 2018Observed: 16.05 ft at 7:30PM Dec 09, 2018Observed: 16.05 ft at 7:45PM Dec 09, 2018Observed: 16.06 ft at 8:00PM Dec 09, 2018Observed: 16.05 ft at 8:15PM Dec 09, 2018Observed: 16.04 ft at 8:30PM Dec 09, 2018Observed: 16.06 ft at 8:45PM Dec 09, 2018Observed: 16.05 ft at 9:00PM Dec 09, 2018Observed: 16.05 ft at 9:15PM Dec 09, 2018Observed: 16.05 ft at 9:30PM Dec 09, 2018Observed: 16.03 ft at 9:45PM Dec 09, 2018Observed: 16.03 ft at 10:00PM Dec 09, 2018Observed: 16.06 ft at 10:15PM Dec 09, 2018Observed: 15.63 ft at 10:30PM Dec 09, 2018Observed: 15.16 ft at 10:45PM Dec 09, 2018Observed: 14.97 ft at 11:00PM Dec 09, 2018Observed: 14.95 ft at 11:15PM Dec 09, 2018Observed: 14.91 ft at 11:30PM Dec 09, 2018Observed: 14.91 ft at 11:45PM Dec 09, 2018Observed: 14.91 ft at 12:00AM Dec 10, 2018Observed: 14.23 ft at 12:15AM Dec 10, 2018Observed: 13.94 ft at 12:30AM Dec 10, 2018Observed: 13.89 ft at 12:45AM Dec 10, 2018Observed: 13.87 ft at 1:00AM Dec 10, 2018Observed: 13.87 ft at 1:15AM Dec 10, 2018Observed: 13.87 ft at 1:30AM Dec 10, 2018Observed: 13.86 ft at 1:45AM Dec 10, 2018Observed: 13.83 ft at 2:00AM Dec 10, 2018Observed: 13.12 ft at 2:15AM Dec 10, 2018Observed: 12.63 ft at 2:30AM Dec 10, 2018Observed: 12.41 ft at 2:45AM Dec 10, 2018Observed: 12.35 ft at 3:00AM Dec 10, 2018Observed: 12.33 ft at 3:15AM Dec 10, 2018Observed: 12.32 ft at 3:30AM Dec 10, 2018Observed: 12.31 ft at 3:45AM Dec 10, 2018Observed: 12.31 ft at 4:00AM Dec 10, 2018Observed: 12.31 ft at 4:15AM Dec 10, 2018Observed: 12.31 ft at 4:30AM Dec 10, 2018Observed: 12.31 ft at 4:45AM Dec 10, 2018Observed: 12.41 ft at 5:00AM Dec 10, 2018Observed: 13.23 ft at 5:15AM Dec 10, 2018Observed: 13.69 ft at 5:30AM Dec 10, 2018Observed: 13.81 ft at 5:45AM Dec 10, 2018Observed: 13.9 ft at 6:00AM Dec 10, 2018Observed: 14.94 ft at 6:15AM Dec 10, 2018Observed: 15.67 ft at 6:30AM Dec 10, 2018Observed: 15.93 ft at 6:45AM Dec 10, 2018Observed: 15.99 ft at 7:00AM Dec 10, 2018Observed: 16.02 ft at 7:15AM Dec 10, 2018Observed: 16.03 ft at 7:30AM Dec 10, 2018Observed: 16.04 ft at 7:45AM Dec 10, 2018Observed: 16.04 ft at 8:00AM Dec 10, 2018Observed: 16.04 ft at 8:15AM Dec 10, 2018Observed: 16.04 ft at 8:30AM Dec 10, 2018Observed: 16.05 ft at 8:45AM Dec 10, 2018Observed: 16.05 ft at 9:00AM Dec 10, 2018Observed: 16.04 ft at 9:15AM Dec 10, 2018Observed: 16.03 ft at 9:30AM Dec 10, 2018Observed: 16.04 ft at 9:45AM Dec 10, 2018Observed: 16.04 ft at 10:00AM Dec 10, 2018Observed: 16.04 ft at 10:15AM Dec 10, 2018Observed: 16.04 ft at 10:30AM Dec 10, 2018Observed: 16.04 ft at 10:45AM Dec 10, 2018Observed: 16.05 ft at 11:00AM Dec 10, 2018Observed: 16.03 ft at 11:15AM Dec 10, 2018Observed: 16.04 ft at 11:30AM Dec 10, 2018Observed: 16.03 ft at 11:45AM Dec 10, 2018Observed: 16.05 ft at 12:00PM Dec 10, 2018Observed: 16.04 ft at 12:15PM Dec 10, 2018Observed: 16.04 ft at 12:30PM Dec 10, 2018Observed: 16.04 ft at 12:45PM Dec 10, 2018Observed: 16.04 ft at 1:00PM Dec 10, 2018Observed: 16.03 ft at 1:15PM Dec 10, 2018Observed: 16.03 ft at 1:30PM Dec 10, 2018USGS--Water Resources of the United StatesCNWM2(plotting HGIRG) Graph Created (2:17PM Dec 10, 2018)ObservedLatest observed value: 16.03 ft at 1:30 PM EST 10-Dec-2018. Flood Stage is 23.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Gauge reading affected by power generation.

NOTE: Forecasts for the Susquehanna River at Conowingo Dam are issued as needed during times of high water, but are not routinely available.

Return to Area Map
Upstream Gauge - at Marietta Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 28.5
Moderate Flood Stage: 24.8
Flood Stage: 23.5
Action Stage: 21.5
Low Stage (in feet): 0

Historic Crests
(1) 36.83 ft on 06/24/1972
(2) 34.18 ft on 01/20/1996
(3) 32.41 ft on 09/09/2011
(4) 30.92 ft on 09/27/1975
(5) 30.07 ft on 09/19/2004 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 26.08 ft on 07/26/2018
(2) 32.41 ft on 09/09/2011
(3) 25.12 ft on 04/29/2011
(4) 23.46 ft on 04/19/2011
(5) 21.52 ft on 03/11/2011
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 www.floodsmart.gov.

Zoom Level:16
KML Image
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
24.8 Backyards and basements on Main Street and Tome's Landing begin to flood.
23.7 Minor flooding begins in the town of Port Deposit, Maryland.
22.9 Maryland Route 222 north of Port Deposit is closed.
About This Location Collapse

Latitude: 39.657778° N, Longitude: 76.174444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 23.5 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 4.16 27.66 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
3 Day (SREF) 7 Day (NAEFS) 7 Day (GEFS)
SREF Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics. 

Click individual graphics to enlarge.

During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.
Resources Collapse
Hydrologic Resources Additional Resources
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
Philadelphia/Mount Holly Weather Forecast Office
732 Woodlane Road
Mount Holly, NJ 08060-9615
(609) 261-6600
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Page last modified: 21-Dec-2016 5:21 PM
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