• Explore the NEW USGS National Water Dashboard interactive map to access real-time water data from over 13,500 stations nationwide.
• Full News

ICE EFFECTS ON STREAMFLOW

The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.

• Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
• For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
• For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
• For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
• Not all sites have reports available for every water year.