Data

This data release presents geologic map data for the surficial geology of the Overton, Lake Mead, and Las Vegas 30-minute by 60-minute quadrangles, Arizona, Utah, and Nevada. This 1:100,000 scale geologic mapping incorporates new interpretive contributions and compilation from 1:24,000 to 1:250,000 scale published geologic map data sources. Geology incorporated from previous mapping has...

From 2022 through 2024, the U.S. Geological Survey (USGS) conducted a study in cooperation with the Arkansas River Basin Regional Resources Planning Group (Southeastern Colorado Water Conservancy District, Colorado Springs Utilities, Pueblo Water, Lower Arkansas Valley Water Conservancy District, Aurora Water, and Upper Arkansas Water Conservancy District) to establish a basin-wide water...

Viral nervous necrosis is a neurologic disease that causes vacuolating lesions in the brain and retina of a broad range of marine fish species. The viral agent responsible is nervous necrosis virus (NNV), a Betanodavirus within the family Nodaviridae. Based on genetic characterization of the viral genome, at least four species of NNV are known to exist, though this diversity is likely...

These data contain information about the sites, visits, and transects surveyed for Siskiyou Mountains salamanders (Plethodon stormi) and Scott Bar salamanders (P. asupak) in Siskiyou County, California, 2023-2024. The survey sites were near locations of recent (since 2005) historical occurrence of the salamanders and were designed to separate occurrence, availability on the surface, and...

Engagement of end-users and fellow experts is fundamental to the creation of useful scientific tools. We conducted a survey-based research project to assist scientists responsible for creating scientific tools by evaluating their engagement of end-users and experts in the development of these tools. Our study includes a suite of six United States Geological Survey (USGS) projects that...

Locations of sites at which U.S. Geological Survey (USGS) biologists surveyed for Temblor legless lizards (Anniella alexanderae) from 2022 to 2025 and the results of those surveys. At the time of the species description, little was known about the distribution of the Temblor legless lizard beyond a few localities. Surveys were designed to gather information on the distribution of Temblor...

This shapefile depicts individual campsites areas surveyed at 37 sandbar sites along the Colorado River through Grand Canyon, from Lees Ferry to Diamond Creek, from 1999 to 2024. Campsite areas were measured through total station surveys, outlining the perimeter of areas available for camping use at each study site. Campsite area is defined as an area with smooth substrate, typically...

This data set consists of 96-hour survival of the mayfly Neocloeon triangulifer exposed to a variety of major ion (sodium, potassium, calcium, magnesium, chloride, sulfate, bicarbonate) single salts, binary, and trinary mixtures, gluconate salts, and the organic molecule D-mannitol. Mayflies were less than 24-hours old at the beginning of tests. Mixtures consisted of pairs with either...

This data set contains toxicity data from 24- and 96-hour water bioassays to assess the effects of a Syngenta Crop Protection product on early life stages of a freshwater mussel. We used ASTM International methods to conduct tests with juveniles and glochidia of the freshwater mussel Lampsilis siliquoidea. Analytical chemistry and water quality analysis results are included as well.

These tables provide observations of sage-grouse, both translocated and not, during the nesting and brooding phases. With respect to nests we include observations of clutch size, egg hatchability, and adult survival during this period. For the brooding period we include both adult and chick survival as well as initial and final brood size. Lastly, we include peak male counts at leks for...

This data set includes mortality data from acute toxicity tests with juveniles of the mussel, Lampsilis siliquoidea exposed to 6PPD and 6PPDQ. Concurrently collected analytical chemistry and general water quality measurements are included.

We investigated the survival and reproductive success of Ceriodaphnia dubia that were exposed to a concentration series of four current-use fire retardants (Phos-Chek 259-Fx Phos-Chek MVP-Fx, Phos-Chek LC95A-Fx, and Phos-Chek LC95A-R) to determine if exposure duration and concentration of the product altered the survival of C. dubia and the number of neonates produced by C. dubia. We...