Data

These data were compiled in support of the Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead (Post 2026) Environmental Impact Statement (EIS). These data were outputs from models that estimate annual minimum dissolved oxygen and daily water temperature in the Colorado River below Glen Canyon Dam. The objective of our study was to predict water temperatures and...

These data were compiled to model ecosystem metabolism in the Glen Canyon Dam tailwater (e.g., the Colorado River below Glen Canyon Dam). The primary objective of our study was to develop a new ecosystem metabolism model which we refer to as the variable flow two-station (VFTS) model. The VFTS modifies the classic two-station metabolism approach to account for unsteady flow, thus...

This data release contains a timeseries (2004-2025) of photographs from five permanent locations (Stops 1-5, roughly 11x15 centimeters) established to observe biological soil crusts (BSC, a collection of species of lichens, cyanobacteria, and bryophytes). The five locations were randomly located within a larger study area established to monitor vegetation and biological soil crusts as...

These data were compiled for the U.S. Navy and U.S. Fish and Wildlife Service and consist of summary counts at selected population monitoring sites for the Island Night Lizard (Xantusia riversiana), and measurement data (body length, mass) for calculating an index of body condition. Objectives of this study were to provide long-term population trend and health and condition data to the U...

These tabular data were compiled to monitor vegetation and biocrust cover two previously grazed grassland located in the Needles District of Canyonlands National Park. Objectives of this study are to document potential changes in biological soil crust (biocrust) and vegetation cover and species composition over time and with ongoing U.S. National Park Service (NPS) management. These data...

These data were compiled in support of the Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead (Post-2026) Environmental Impact Statement (EIS). These data were used to illustrate how six operational strategies (one baseline and 5 alternatives) for Glen Canyon Dam could affect riparian plant communities along the Colorado River between Glen Canyon Dam and Lake...

These data were compiled in support of the Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead (Post-2026) Environmental Impact Statement (EIS). These data were compiled to predict the impact of different proposed alternatives for Glen Canyon Dam operations on sand resources, including sand mass balance, sandbar volume, and frequency/duration of controlled...

These data were compiled in support of the Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead (Post 2026) Environmental Impact Statement (EIS). These data were outputs from models that estimate annual smallmouth bass entrainment through Glen Canyon Dam and annual smallmouth bass population growth rate (lambda) in the Colorado River below Glen Canyon Dam. The...

These spatial and tabular data were compiled to have a decade-long record of the water usage in the riparian corridor and the wetlands near Phoenix, Arizona called the Tres Rios area to observe the effect of riparian and wetland health as characterized by vegetation greenness and its water use or evapotranspiration. The objective of our study was to quantify evapotranspiration (in...

During steady releases from Glen Canyon Dam in 2021, geomorphic data were collected for the Colorado River in Grand Canyon National Park from Lees Ferry to Pearce Ferry. A boat based survey collected position data using Global Navigation Satellite Systems and bathymetry data using a multibeam sonar system. Individual water's edge locations were measured using total stations referenced to...

This dataset describes the catch of humpback chub (Gila cypha) in baited hoop nets from humpback chub aggregations monitoring trips that occurred 2010-2024. Additionally, this data set includes tables that describe the number of captures and recaptures for repeat visits (i.e., mark-recapture) as well as categorical habitat scores from two experts assigned to the Colorado River in western...

These data were compiled for upland vegetation and soil condition assessment and monitoring in arid, semiarid, and montane areas of northwest San Juan County, Utah, USA, near The Nature Conservancy's Canyonlands Research Center (CRC) at Dugout Ranch. The sampling area includes the Needles District of Canyonlands National Park, the Indian Creek Allotment of the Bureau of Land Management...