Unified Interior Regions

Region 6: Arkansas-Rio Grande-Texas-Gulf

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Filter Total Items: 1,611
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Year Published: 2014

Simulation of groundwater flow in the Edwards-Trinity and related aquifers in the Pecos County region, Texas

The Edwards-Trinity aquifer, a major aquifer in the Pecos County region of western Texas, is a vital groundwater resource for agricultural, industrial, and public supply uses. Resource managers would like to better understand the future availability of water in the Edwards-Trinity aquifer in the Pecos County region and the effects of the possible...

Thomas, Jonathan V.
Simulation of groundwater flow in the Edwards-Trinity and related aquifers in the Pecos County region, Texas; 2014; FS; 2014-3029; Thomas, Jonathan V.

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Year Published: 2014

A multiphased approach to groundwater investigations for the Edwards-Trinity and related aquifers in the Pecos County region, Texas

The Edwards-Trinity aquifer is a vital groundwater resource for agricultural, industrial, and public supply uses in the Pecos County region of western Texas. Resource managers would like to understand the future availability of water in the Edwards-Trinity aquifer in the Pecos County region and the effects of the possible increase or temporal...

Thomas, Jonathan V.
A multiphased approach to groundwater investigations for the Edwards-Trinity and related aquifers in the Pecos County region, Texas; 2014; FS; 2014-3025; Thomas, Jonathan V.

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Year Published: 2014

Adaptations of indigenous bacteria to fuel contamination in karst aquifers in south-central Kentucky

The karst aquifer systems in southern Kentucky can be dynamic and quick to change. Microorganisms that live in these unpredictable aquifers are constantly faced with environmental changes. Their survival depends upon adaptations to changes in water chemistry, taking advantage of positive stimuli and avoiding negative environmental conditions. The...

Byl, Thomas D.; Metge, David W.; Agymang, Daniel T.; Bradley, Michael W.; Hileman, Gregg; Harvey, Ronald W.
T.D. Byl, D.W. Metge, D.T. Agymang, M. Bradley, G. Hileman, and R.W. Harvey, 2014, Adaptations of indigenous bacteria to fuel contamination in karst aquifers in south-central Kentucky: Journal of Cave and Karst Studies, v. 76, no. 2, p. 104–113. DOI: 10.4311/2012MB0270

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Year Published: 2014

Reach-scale comparison of habitat and mollusk assemblages for select sites in the Clinch River with regional context

Several hypotheses, including habitat degradation and variation in fluvial geomorphology, have been posed to explain extreme spatial and temporal variation in Clinch River mollusk assemblages. We examined associations between mollusk assemblage metrics (richness, abundance, recruitment) and physical habitat (geomorphology, streambed composition,...

Ostby, Brett J. K.; Krstolic, Jennifer L.; Johnson, Gregory C.

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Year Published: 2014

Effects of hydrologic modifications on salinity and formation of hypoxia in the Mississippi River-Gulf Outlet and adjacent waterways, southeastern Louisiana, 2008 to 2012

The Mississippi River-Gulf Outlet (MRGO) was constructed between 1958 and 1968 to provide a safer and shorter route between the Gulf of Mexico and the Port of New Orleans for ocean-going vessels. In 2006, the U.S. Congress directed the U.S. Army Corps of Engineers (USACE) to develop and implement a plan to deauthorize a portion of the MRGO ship...

Swarzenski, Christopher M.; Mize, Scott V.
Effects of hydrologic modifications on salinity and formation of hypoxia in the Mississippi River-Gulf Outlet and adjacent waterways, southeastern Louisiana, 2008 to 2012; 2014; SIR; 2014-5077; Swarzenski, Christopher M.; Mize, Scott V.

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Year Published: 2014

Mesohabitats, fish assemblage composition, and mesohabitat use of the Rio Grande silvery minnow over a range of seasonal flow regimes in the Rio Grande/Rio Bravo del Norte, in and near Big Bend National Park, Texas, 2010-11

In 2010–11, the U.S. Geological Survey (USGS), in cooperation with the U.S. Fish and Wildlife Service, evaluated the physical characteristics and fish assemblage composition of mapped river mesohabitats at four sites on the Rio Grande/Rio Bravo del Norte (hereinafter Rio Grande) in and near Big Bend National Park, Texas. The four sites used...

Moring, J. Bruce; Braun, Christopher L.; Pearson, Daniel K.
Mesohabitats, fish assemblage composition, and mesohabitat use of the Rio Grande silvery minnow over a range of seasonal flow regimes in the Rio Grande/Rio Bravo del Norte, in and near Big Bend National Park, Texas, 2010-11; 2014; SIR; 2013-5210; Moring, J. Bruce; Braun, Christopher L.; Pearson, Daniel K.

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Year Published: 2014

Influences of water and sediment quality and hydrologic processes on mussels in the Clinch River

Segments of the Clinch River in Virginia have experienced declining freshwater mussel populations during the past 40 years, while other segments of the river continue to support some of the richest mussel communities in the country. The close proximity of these contrasting reaches provides a study area where differences in climate, hydrology...

Johnson, Gregory C.; Krstolic, Jennifer L.; Ostby, Brett J.K.

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Year Published: 2014

Arkansas Groundwater-Quality Network

Arkansas is the fourth largest user of groundwater in the United States, where groundwater accounts for two-thirds of the total water use. Groundwater use in the State increased by 510 percent between 1965 and 2005 (Holland, 2007). The Arkansas Groundwater-Quality Network is a Web map interface (http://ar.water.usgs.gov/wqx) that provides rapid...

Pugh, Aaron L.; Jackson, Barry T.; Miller, Roger
Arkansas Groundwater-Quality Network; 2014; FS; 2013-3042; Pugh, Aaron L.; Jackson, Barry T.; Miller, Roger

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Year Published: 2014

Geology and hydrostratigraphy of Guadalupe River State Park and Honey Creek State Natural Area, Kendall and Comal Counties, Texas

Hydrogeologic mapping and descriptions of the lithostratigraphy and hydrostratigraphy of Guadalupe River State Park and Honey Creek State Natural Area, Kendall and Comal Counties, Texas, are presented in this first detailed 1:24,000 geologic map, along with proposed names and descriptions of the hydrostratigraphic units in the study area....

Clark, Allan K.; Blome, Charles D.; Morris, Robert R.
Geology and hydrostratigraphy of Guadalupe River State Park and Honey Creek State Natural Area, Kendall and Comal Counties, Texas; 2014; SIM; 3303; Clark, Allan K.; Blome, Charles D.; Morris, Robert R.

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Year Published: 2014

Hydrogeologic aspects of the Knippa Gap area in eastern Uvalde and western Medina counties, Texas

The Edwards aquifer is the primary source of potable water for the San Antonio area in south-central Texas. The Knippa Gap area is a structural low (trough) postulated to channel or restrict flow in the Edwards aquifer in eastern Uvalde and western Medina Counties, Tex. To better understand the function of the Knippa Gap, the U.S. Geological...

Lambert, Rebecca B.; Clark, Allan K.; Pedraza, Diana E.; Morris, Robert R.
Hydrogeologic aspects of the Knippa Gap area in eastern Uvalde and western Medina counties, Texas; 2014; FS; 2014-3045; Lambert, Rebecca B.; Clark, Allan K.; Pedraza, Diana E.; Morris, Robert R.

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Year Published: 2014

Hydrologic data for the Obed River watershed, Tennessee

The Obed River watershed drains a 520-square-mile area of the Cumberland Plateau physiographic region in the Tennessee River basin. The watershed is underlain by conglomerate, sandstone, and shale of Pennsylvanian age, which overlie Mississippian-age limestone. The larger creeks and rivers of the Obed River system have eroded gorges through the...

Knight, Rodney R.; Wolfe, William J.; Law, George S.
Hydrologic data for the Obed River watershed, Tennessee; 2014; OFR; 2014-1102; Knight, Rodney R.; Wolfe, William J.; Law, George S.

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Year Published: 2014

Evaluation of groundwater and surface-water interactions in the Caddo Nation Tribal Jurisdictional Area, Caddo County, Oklahoma, 2010-13

Streamflows, springs, and wetlands are important natural and cultural resources to the Caddo Nation. Consequently, the Caddo Nation is concerned about the vulnerability of the Rush Springs aquifer to overdrafting and whether the aquifer will continue to be a viable source of water to tribal members and other local residents in the future. Interest...

Mashburn, Shana L.; Smith, S. Jerrod
Evaluation of groundwater and surface-water interactions in the Caddo Nation Tribal Jurisdictional Area, Caddo County, Oklahoma, 2010-13; 2014; SIR; 2014-5082; Mashburn, Shana L.; Smith, S. Jerrod

Filter Total Items: 265
Image: USGS Responds to Near Record Flooding in Central Texas
October 31, 2013

USGS Responds to Near Record Flooding in Central Texas

USGS scientist Mark Warzecha makes a streamflow measurement with Acoustic Doppler Current Profiler downstream of a USGS streamgage station on the Blanco River at Interstate 35. The streamgage is not currently accessible, so a measurement is being made at the safest downstream location. 

 

August 27, 2013

Water-level Change in the High Plains Aquifer System

In 1986, Congress directed the USGS to regularly report groundwater-level changes in the High Plains aquifer system. To comply with this directive, the USGS compares water levels measured every two years. By measuring water levels across the entire aquifer in one year, measurements made two years later enable calculation of changes over time. Measured water levels from

July 29, 2013

Climate, Water Quality, Toxic Blooms of Golden Alga in Texas

This webinar, Climate, Water Quality, Toxic Blooms of Golden Alga in Texas, was presented by Reynaldo Patino from the USGS Texas Cooperative Fish and Wildlife Research Unit.

Collection of a suspended-sediment sample by hydrologic technicians at U.S. Geological Survey station 08185000 Cibolo Creek.
May 25, 2013

Collecting suspended-sediment sample, Cibolo Ck., Tex.

Collection of a suspended-sediment sample by hydrologic technicians at U.S. Geological Survey station 08185000 Cibolo Creek at Selma, Texas, on May 25, 2013. The technician in the foreground is using a smart phone to check peak discharge at the site during the flood by accessing http://m.waterdata.usgs.gov (

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Photo of two of the main spring discharge points of Comal springs.
April 11, 2013

Two of the main spring discharge points of Comal springs, Texas

Two of the main spring discharge points of Comal springs.

A new website now provides important information about streamflow in the Comal and San Marcos Rivers and springflow at Comal and San Marcos Springs.

Travertine deposits near site 4 (Post Oak Falls near Tow, Texas, October 31, 2012).
October 31, 2012

Travertine deposits, Post Oak Falls near Tow, Texas

Travertine deposits near site 4 (Post Oak Falls near Tow, Texas, October 31, 2012) (photograph by Jennifer Wilson, U.S. Geological Survey).

SIR 2015–5098

Filter Total Items: 175
USGS
September 17, 1999

Wildfires have long played a key role in structuring ecosystems and plant communities in the southeastern United States. From the coastal prairie of Texas and Louisiana to the marshes and pinelands of Florida, many native species have adapted to a natural regime of frequent wildfire caused by lightning strikes.

USGS
August 23, 1999

Scientists from the U.S. Geological Survey (USGS) in Texas are working with local, state and federal officials to provide near real-time flood data in the wake of Hurricane Bret to emergency managers and others who then use the data to make decisions on evacuations and water management.

USGS
January 21, 1999

Nutrients from the Mississippi River Basin are believed to be responsible, at least in part, for the large hypoxic zone that develops on the Louisiana-Texas shelf in the Gulf of Mexico each summer, according to Don Goolsby, a hydrologist with the U.S.Geological Survey in Denver, Colo.

USGS
October 22, 1998

After enduring a summer full of sweltering temperatures, tropical storms, and floods, 20 inches of rain suddenly fell in areas of south central and eastern Texas this past week causing weather turmoil once again. Flooding from these rains has teams of scientists from the U.S. Geological Survey (USGS) mobilized to take water level and discharge measurements at rain-swollen streams.

USGS
September 24, 1998

U.S. Geological Survey (USGS) scientist, Katherine Kendall, will be awarded the National Park Service’s Natural Resource Research Award on September 28, at the Service’s annual Natural Resources Stewardship and Science Meeting in Austin, Texas.

USGS
April 16, 1998

A 5-year study of water quality in the Rio Grande Valley, from its headwaters in Colorado to near El Paso, Texas, has been completed by the U.S. Geological Survey (USGS). The study focused on ground water in the flood plain of the Rio Grande and surface water in the Rio Grande and selected tributaries.

USGS
November 21, 1996

The gasoline additive MTBE (methyl tert-butyl ether) was detected in some urban stormwater samples collected in 16 cities and metropolitan areas by the U.S. Geological Survey, but all detections of MTBE were less than the lower limit of the U.S. Environmental Protection Agency’s draft lifetime health advisory for drinking water.