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The U.S. Geological Survey (USGS) in cooperation with the Harris‐Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, and Lone Star Groundwater Conservation District has produced this dataset of groundwater‐level altitudes and groundwater‐level altitude changes in the Chicot, Evangeline, and Jasper aquifers in the Houston‐Galveston region, Texas. This dataset shows current‐year (2018) groundwater‐level altitudes for each aquifer, 5‐year (2013‐18) groundwater‐level changes for each aquifer, long‐term (1990‐2018 and 1977‐2018) groundwater‐level changes for the Chicot and Evangeline aquifers, and long‐term (2000‐2018) groundwater‐level change for the Jasper aquifer. The groundwater‐level measurements...
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These vector contour lines are derived from the 3D Elevation Program using automated and semi-automated processes. They were created to support 1:24,000-scale CONUS and Hawaii, 1:25,000-scale Alaska, and 1:20,000-scale Puerto Rico / US Virgin Island topographic map products, but are also published in this GIS vector format. Contour intervals are assigned by 7.5-minute quadrangle, so this vector dataset is not visually seamless across quadrangle boundaries. The vector lines have elevation attributes (in feet above mean sea level on NAVD88), but this dataset does not carry line symbols or annotation.


map background search result map search result map USGS Topo Map Vector Data (Vector) 7034 Candor NC (published 20221018) FileGDB USGS Topo Map Vector Data (Vector) 31779 New London NC (published 20221018) FileGDB USGS Topo Map Vector Data (Vector) 14138 Elliston VA (published 20221019) FileGDB USGS Topo Map Vector Data (Vector) 22096 Ironto VA (published 20221019) Shapefile USGS Topo Map Vector Data (Vector) 17484 Glenvar VA (published 20221019) FileGDB USGS Topo Map Vector Data (Vector) 19977 Hedges KY (published 20221103) FileGDB USGS Topo Map Vector Data (Vector) 31486 Needmore TN (published 20221019) Shapefile USGS Topo Map Vector Data (Vector) 31565 Neodesha, Kansas 20220430 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 31880 New Waverly TX (published 20220823) Shapefile USGS Topo Map Vector Data (Vector) 33029 Oklahoma TX (published 20220823) FileGDB USGS Topo Map Vector Data (Vector) 35708 Plum Grove TX (published 20220823) Shapefile USGS Topo Map Vector Data (Vector) 42501 Spies NC (published 20221018) Shapefile USGS Topo Map Vector Data (Vector) 18594 Griswold NE, Iowa 20220429 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21740 Imogene, Iowa 20220429 for 7.5 x 7.5 minute FileGDB 10.1 Groundwater-Level Altitudes and Long-term Groundwater-Level Changes in the Chicot, Evangeline, and Jasper Aquifers, Houston-Galveston Region, Texas, 2018 USGS NED 1/3 arc-second Contours for Raleigh W, North Carolina 1 x 1 degree (published 20221017) GeoPackage USGS Topo Map Vector Data (Vector) 30317 Morrow Mountain NC (published 20221018) GeoPackage USGS Topo Map Vector Data (Vector) 31988 Newport VA (published 20221018) GeoPackage USGS Topo Map Vector Data (Vector) 17484 Glenvar VA (published 20221019) GeoPackage USGS Topo Map Vector Data (Vector) 34021 Palmyra TN (published 20221019) GeoPackage USGS Topo Map Vector Data (Vector) 7034 Candor NC (published 20221018) FileGDB USGS Topo Map Vector Data (Vector) 31779 New London NC (published 20221018) FileGDB USGS Topo Map Vector Data (Vector) 14138 Elliston VA (published 20221019) FileGDB USGS Topo Map Vector Data (Vector) 22096 Ironto VA (published 20221019) Shapefile USGS Topo Map Vector Data (Vector) 17484 Glenvar VA (published 20221019) FileGDB USGS Topo Map Vector Data (Vector) 19977 Hedges KY (published 20221103) FileGDB USGS Topo Map Vector Data (Vector) 31486 Needmore TN (published 20221019) Shapefile USGS Topo Map Vector Data (Vector) 31565 Neodesha, Kansas 20220430 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 31880 New Waverly TX (published 20220823) Shapefile USGS Topo Map Vector Data (Vector) 33029 Oklahoma TX (published 20220823) FileGDB USGS Topo Map Vector Data (Vector) 35708 Plum Grove TX (published 20220823) Shapefile USGS Topo Map Vector Data (Vector) 42501 Spies NC (published 20221018) Shapefile USGS Topo Map Vector Data (Vector) 18594 Griswold NE, Iowa 20220429 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21740 Imogene, Iowa 20220429 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 30317 Morrow Mountain NC (published 20221018) GeoPackage USGS Topo Map Vector Data (Vector) 31988 Newport VA (published 20221018) GeoPackage USGS Topo Map Vector Data (Vector) 17484 Glenvar VA (published 20221019) GeoPackage USGS Topo Map Vector Data (Vector) 34021 Palmyra TN (published 20221019) GeoPackage USGS NED 1/3 arc-second Contours for Raleigh W, North Carolina 1 x 1 degree (published 20221017) GeoPackage Groundwater-Level Altitudes and Long-term Groundwater-Level Changes in the Chicot, Evangeline, and Jasper Aquifers, Houston-Galveston Region, Texas, 2018