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USGS Water Resources		Data Category: Home Current Conditions Site Information Mapper Surface Water Groundwater Water Quality Water Use	Geographic Area: United States Alabama Alaska American Samoa Arizona Arkansas California Colorado Connecticut Delaware Dist. of Columbia Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virgin Islands Virginia Washington West Virginia Wisconsin Wyoming

News - updated January 8,2013

USGS Current Water Data for Maryland

During cold weather, ice effects on stage, ground water levels, precipitation and water quality parameters at some stream-gaging stations and wells are likely. Data values reported on these pages may be significantly higher or lower than actual values. Adjustment of data for ice effects can only be done after detailed analysis. Users are encouraged to contact this office for more information on specific stream-gaging stations or wells.

Daily Streamflow Conditions Select a site to retrieve data and station information. Explanation High > 90th percentile 76th - 90th percentile 25th - 75th percentile 10th - 24th percentile < 10th percentile Low Not ranked The colored dots on this map depict streamflow conditions as a percentile, which is computed from the period of record for the current day of the year. Only stations with at least 30 years of record are used. The gray circles indicate other stations that were not ranked in percentiles either because they have fewer than 30 years of record or because they report parameters other than streamflow. Some stations, for example, measure stage only.

IMPORTANT INFORMATION FOR: Partners, Stakeholders, and Data Users of the USGS Maryland-Delaware-District of Columbia Streamflow-, Tide-, and Reservoir-Elevation-Gage Networks SUBJECT: Referencing local streamflow, tide, and reservoir-elevation gage-height data to the North American Vertical Datum of 1988 NOTICE (11/30/2012) --Data collection at the following gage will be discontinued due to funding reductions from partner agencies. Although historic data will remain accessible, no new data will be collected unless one or more new funding partners are found. Users who can contribute funding for the non-Federal share of costs to continue operation of this streamgage should contact Jon Dillow of the USGS Maryland-Delaware-DC Water Science Center at 443-498-5524, jjdillow@usgs.gov. Gage Number Stream Gage Name Length of Record Comment 01589000 PATAPSCO RIVER AT HOLLOFIELD, MD 54 years To be discontinued December 31, 2012. 01589025 PATAPSCO RIVER NEAR CATONSVILLE, MD 1 year To be discontinued December 31, 2012. 01589035 PATAPSCO RIVER NEAR ELKRIDGE, MD 1 year To be discontinued December 31, 2012. Statewide Streamflow Real-Time Table Statewide Groundwater Real-Time Table Statewide Water-Quality Real-Time Table Real-time data typically are recorded at 15-60 minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Recording and transmission times may be more frequent during critical events. Data from real-time sites are relayed to USGS offices via satellite, telephone, and/or radio and are available for viewing within minutes of arrival. All real-time data are provisional and subject to revision. Build Real-Time Table Show a custom real-time summary table for one or more stations. Build Time Series Show custom graphs or tables for a series of recent data for one or more stations.