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In cooperation with Dallas Water Utilities (DWU), the U.S. Geological Survey (USGS) measures nutrient and major-ion concentrations in selected reservoirs in north Texas. This data release documents water-quality data obtained from Ray Hubbard Lake, Grapevine Lake, Ray Roberts Lake, and Lake Lewisville during water years 2016-20. In addition to nutrient and major-ion concentrations, water-quality field properties and other selected constituents measured in the water-quality samples collected from these reservoirs are documented. The study began in water year 2016 (WY16) with monthly sampling of Ray Hubbard Lake. A water year is defined as the 12-month period from October 1 through September 30 and is designated...
    map background search result map search result map USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, CA 1995 USGS 1:24000-scale Quadrangle for Grapevine, CA 1991 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:62500-scale Quadrangle for Grapevine, TX 1931 USGS 1:62500-scale Quadrangle for Grapevine, TX 1959 USGS 1:62500-scale Quadrangle for Grapevine, TX 1931 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 Nutrients and Major-Ions Measured in Water-Quality Samples Collected from Four North Texas Reservoirs (ver. 3.0, September 2021) USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, AR 1964 USGS 1:24000-scale Quadrangle for Grapevine, CA 1995 USGS 1:24000-scale Quadrangle for Grapevine, CA 1991 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:24000-scale Quadrangle for Grapevine, CA 1958 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:24000-scale Quadrangle for Grapevine, TX 1959 USGS 1:62500-scale Quadrangle for Grapevine, TX 1931 USGS 1:62500-scale Quadrangle for Grapevine, TX 1959 USGS 1:62500-scale Quadrangle for Grapevine, TX 1931 Nutrients and Major-Ions Measured in Water-Quality Samples Collected from Four North Texas Reservoirs (ver. 3.0, September 2021)