Mission Areas L2 Landing Page Tabs
Preliminary flood-duration frequency estimates using naturalized streamflow records for the Willamette River Basin, Oregon
In this study, “naturalized” daily streamflow records, created by the U.S. Army Corps of Engineers and the Bureau of Reclamation, were used to compute 1-, 3-, 7-, 10-, 15-, 30-, and 60-day annual maximum streamflow durations, which are running averages of daily streamflow for the number of days in each duration. Once the annual maximum durations...Lind, Greg D.; Stonewall, Adam J.
The metabolic regimes of flowing waters
The processes and biomass that characterize any ecosystem are fundamentally constrained by the total amount of energy that is either fixed within or delivered across its boundaries. Ultimately, ecosystems may be understood and classified by their rates of total and net productivity and by the seasonal patterns of photosynthesis and respiration....Bernhardt, Emily S.; Heffernan, Jim B.; Grimm, Nancy B.; Stanley, Emily H.; Harvey, Judson; Arroita, M.; Appling, Alison P.; Cohen, M.J.; McDowell, William H.; Hall, R.O.; Read, Jordan S.; Roberts, B.J.; Stets, Edward G.; Yackulic, Charles B.
Water pressure and ground vibrations induced by water guns near Bandon Road Lock and Dam and Lemont, Illinois
Multiple geophysical sensors were used to characterize the underwater pressure field and ground vibrations of a seismic water gun and its suitability to deter the movement of Asian carps (particularly the silver [Hypophthalmichthys molitrix] and bighead [Hypophthalmichthys nobilis] carps) while ensuring the integrity of surrounding structures. The...Adams, Ryan F.; Koebel, Carolyn M.; Morrow, William S.
Comparison of HSPF and PRMS model simulated flows using different temporal and spatial scales in the Black Hills, South Dakota
The hydrological simulation program Fortran (HSPF) [Hydrological Simulation Program Fortran version 12.2 (Computer software). USEPA, Washington, DC] and the precipitation runoff modeling system (PRMS) [Precipitation Runoff Modeling System version 4.0 (Computer software). USGS, Reston, VA] models are semidistributed, deterministic...Chalise, D. R.; Haj, Adel E.; Fontaine, T.A.
Modeling drivers of phosphorus loads in Chesapeake Bay tributaries and inferences about long-term change
Causal attribution of changes in water quality often consists of correlation, qualitative reasoning, listing references to the work of others, or speculation. To better support statements of attribution for water-quality trends, structural equation modeling was used to model the causal factors of total phosphorus loads in the Chesapeake Bay...Ryberg, Karen R.; Blomquist, Joel D.; Sprague, Lori A.; Sekellick, Andrew J.; Keisman, Jennifer L.D.
Assessment of water resources and the potential effects from oil and gas development in the Bureau of Land Management Tri-County planning area, Sierra, Doña Ana, and Otero Counties, New Mexico
The U.S. Geological Survey (USGS), in cooperation with the Bureau of Land Management, conducted a study to assess the water resources and potential effects on the water resources from oil and gas development in the Tri-County planning area, Sierra, Doña Ana, and Otero Counties, New Mexico. Publicly available data were used to assess these...Blake, Johanna M.; Miltenberger, Keely; Stewart, Anne M.; Ritchie, Andre; Montoya, Jennifer; Durr, Corey; McHugh, Amy R.; Charles, Emmanuel
Floodplain trapping and cycling compared to streambank erosion of sediment and nutrients in an agricultural watershed
Floodplains and streambanks can positively and negatively influence downstream water quality through interacting geomorphic and biogeochemical processes. Few studies have measured those processes in agricultural watersheds. We measured inputs (floodplain sedimentation and dissolved inorganic loading), cycling (floodplain soil nitrogen [N] and...Gillespie, Jaimie; Noe, Gregory B.; Hupp, Cliff R.; Gellis, Allen; Schenk, Edward R.
Juvenile coho salmon growth and health in streams across an urbanization gradient
Expanding human population and urbanization alters freshwater systems through structural changes to habitat, temperature effects from increased runoff and reduced canopy cover, altered flows, and increased toxicants. Current stream assessments stop short of measuring health or condition of species utilizing these freshwater habitats and fail to...Spanjer, Andrew R.; Moran, Patrick W.; Larsen, Kimberly; Wetzel, Lisa; Hansen, Adam G.; Beauchamp, David A.
Relationships between indicators of acid-base chemistry and fish assemblages in streams of the Great Smoky Mountains National Park
The acidity of many streams in the Great Smoky Mountains National Park (GRSM) has increased significantly since pre-industrial (∼1850) times due to the effects of highly acidic atmospheric deposition in poorly buffered watersheds. Extensive stream-monitoring programs since 1993 have shown that fish and macroinvertebrate assemblages have been...Baldigo, Barry P.; Kulp, Matt A.; Schwartz, John S.
Shrubland carbon sink depends upon winter water availability in the warm deserts of North America
Global-scale studies suggest that dryland ecosystems dominate an increasing trend in the magnitude and interannual variability of the land CO2 sink. However, such model-based analyses are poorly constrained by measured CO2 exchange in open shrublands, which is the most common global land cover type, covering ∼14% of Earth’s surface. Here...Biederman, Joel A. ; Scott, Russell L.; John A. Arnone; Jasoni, Richard L. ; Litvak, Marcy E.; Moreo, Michael T.; Papuga, Shirley A.; Ponce-Campos, Guillermo E.; Schreiner-McGraw, Adam P. ; Vivoni, Enrique R.
Unraveling the dynamics of magmatic CO2 degassing at Mammoth Mountain, California
The accumulation of magmatic CO2 beneath low-permeability barriers may lead to the formation of CO2-rich gas reservoirs within volcanic systems. Such accumulation is often evidenced by high surface CO2 emissions that fluctuate over time. The temporal variability in surface degassing is believed in part to reflect a complex interplay...Pfeiffer, Loic; Wanner, Christoph; Lewicki, Jennifer L.
Why large cells dominate estuarine phytoplankton
Surveys across the world oceans have shown that phytoplankton biomass and production are dominated by small cells (picoplankton) where nutrient concentrations are low, but large cells (microplankton) dominate when nutrient-rich deep water is mixed to the surface. I analyzed phytoplankton size structure in samples collected over 25 yr in San...Cloern, James E.
The USGS produces many types of multimedia products. Use the links below to browse our offerings of photograph galleries, podcasts and sound files, videos, aerial photos, and posters related to water. The USGS Newsroom has a Web page that highlights the main collection of multimedia products.
Chris Henry and Daniel McCay, USGS hydrologic technicians, use GPS equipment to survey a high-water mark outside of a flooded elementary school in Denham Springs, Louisiana, August 28. This school was located in one of the hardest hit flood areas and the blue line simulates how high the water was at its peak during this historic flood.
USGS Scientists launching an autonomous underwater vehicle (AUV)
An AUV can provide high spatial resolution of water-quality characteristics; such as, temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll, and blue-green algae. The instrument can also provide bathymetry data, water velocity profiles, and side-scan sonar...
The Bronx River has been straightened as it flows by a street in New York City. The Bronx River was one of many streams sampled in the Northeastern U.S. as part of the Regional Stream Quality Assessments (RSQA).
USGS scientists prepare water-quality instruments before going out on the Great Salt Lake. USGS scientists are conducting a study to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
USGS scientists conducting a study on the Great Salt Lake to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
TEMPE, Ariz. — Climate change and growing human demands for water are leaving an indelible mark on rivers and streams, shortening food chains and eliminating some top predators like large-bodied fish, according to a new study led by Arizona State University and co-authored by a U.S. Geological Survey scientist.
YOSEMITE NATIONAL PARK, Calif. — The wraps came off a new streamgage and interpretive station at a popular streamside location in Yosemite National Park today.
The station includes a new streamgage for the Merced River – where the U.S. Geological Survey has measured streamflow since 1915 – as well as a complex array of National Weather Service instruments, a webcam, and a special series of...
Reporters are invited to witness a dedication ceremony and ribbon cutting for a new streamgage, interpretive displays, weather instruments, and a webcam on the Merced River in Yosemite Valley.
Elevated concentrations of nitrogen and phosphorus, nutrients that can negatively impact aquatic ecosystems and human health, have remained the same or increased in many streams and aquifers across the Nation since the early 1990’s, according to a new national study by the U.S. Geological Survey.
USGS will brief Congress, the media and the public on nutrient concentrations in the Nation's water resources, key sources of nutrients, potential effects on humans and aquatic life, and changes in concentrations since the early 1990’s.
Reducing the delivery of nutrients to the Chesapeake Bay is one of the most important components of restoration efforts to achieve a healthy Bay ecosystem. The USGS has developed a new method for tracking the progress toward reducing nitrogen and phosphorus delivery from the watershed to the Bay.
Earthy or musty odors, along with visual evidence of blue-green algae, also known as cyanobacteria, may serve as a warning that harmful cyanotoxins are present in lakes or reservoirs. In a newly published USGS study of cyanobacterial blooms in Midwest lakes, taste-and-odor compounds were found almost every time cyanotoxins were found, indicating odor may serve as a warning that harmful toxins...
The Potomac River in Washington, D.C. is showing multiple benefits from restoration efforts, newly published research suggests. Reduced nutrients and improved water clarity have increased the abundance and diversity of submerged aquatic vegetation (SAV) in the Potomac, according to direct measurements taken during the 18-year field study.
SACRAMENTO, CA. — High concentrations of naturally occurring inorganic constituents – including arsenic, boron and lead – are found in about 14 percent of the primary aquifers in Napa, Sonoma and Marin counties, according to a U.S. Geological Survey report
A report issued today by key environmental and scientific federal agencies assesses the increasing prevalence of low-oxygen “dead zones” in U.S. coastal waters and outlines a series of research and policy steps that could help reverse the decades-long trend.
The use of salt to deice pavement can leave urban streams toxic to aquatic life, according to a new U.S. Geological Survey study on the influence of winter runoff in northern U.S. cities, with a special focus on eastern Wisconsin and Milwaukee.