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Importance & Mapping
Importance of Data Collection  Mean Daily Flow in North Fork Catoctin Creek
It is important to have good information about the quantity and quality of water in our streams because it is so vital to the citizens and economy of Loudoun as well as to our natural environment. For this reason, data such as the streamflow data from North Fork Catoctin Creek, are collected and analyzed to provide the information needed to help us responsibly manage this resource.

Stream stage and discharge are currently measured at ten gauging stations in Loudoun County with the data provided in near real-time on the Internet.

Nine of the stations are operated by the U.S. Geological Survey (USGS) with funding assistance from Loudoun County. Eight of these stream gauges were established with funding assistance from a U.S. Environmental Protection Agency grant that the county obtained in 2004.

Maps  Data Collecting Equipment
An interactive map developed by the USGS shows the locations of the stream gauging stations and provides access to stream data. This map also provides data from two USGS groundwater level monitoring sites and two precipitation monitoring sites.

The county has worked with the USGS to upgrade stream gauges in the Goose Creek and Limestone Branch watersheds to provide flood warning image of stream gauge equipment information. At these sites, data are recorded and transmitted every 15 minutes once the water levels in the streams rise to a predetermined height indicative of potential flooding. This information is immediately available to assist emergency officials in alerting homeowners in historically flood prone areas in these two watersheds.

Read more about stream water quality monitoring in Loudoun County.

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