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Spatial and temporal soil moisture and drought variability in the Upper Colorado River Basin This research investigates the interannual variability of soil moisture as related to large-scale climate variability and also evaluates the spatial and temporal variability of modeled deep layer (40?140 cm) soil moisture in the Upper Colorado River Basin (UCRB). A three layers hydrological model VIC-3L (Variable Infiltration Capacity Model ? 3 layers) was used to generate soil moisture in the UCRB over a 50-year period. By using wavelet analysis, deep layer soil moisture was compared to the Palmer Drought Severity Index (PDSI), precipitation, and streamflow to determine whether deep soil moisture is an indicator of climate extremes. Wavelet and coherency analysis for the UCRB indicated a strong relationship between... Categories: Publication; Types: Citation, Journal Citation; Tags: Journal of Hydrology, Upper Colorado River Basin, drought, soil moisture, wavelet analysis Upper Colorado River Basin SPARROW model catchments and synthetic stream network - 2017 This data collection consists of a synthetic stream network and associated catchments developed as the foundation for a Spatially Referenced Regressions on Watershed Attributes (SPARROW) dissolved-solids source and transport model for the Upper Colorado River Basin (UCRB). The SPARROW model requires a hydrologically connected representation of a stream network through which loads are transported from an upstream reach to the next reach downstream (Schwarz and others, 2006; Moore and others, 2004). Each stream reach or segment within this synthetic stream network has an associated local drainage area or catchment used to calculate catchment characteristics that may have an effect on loads being modeled. The synthetic... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arizona, Catchment, Colorado, Dissolved-solids model, Hydrologic network, All tags... New Mexico, SPARROW, Upper Colorado River Basin, Utah, Watershed, Wyoming, geoscientificInformation, inlandWaters, Fewer tags Catchment-flowline network and selected model inputs for an enhanced and updated spatially referenced statistical assessment of dissolved-solids load sources and transport in streams of the Upper Colorado River Basin This USGS data release consists of the synthetic stream network and associated catchments used to develop spatially referenced regressions on watershed attributes (SPARROW) model of dissolved-solids sources and transport in the Upper Colorado River Basin as well as geology and selected Basin Characterization Model (BCM) data used as input to the model. Types: Citation; Tags: Actual Evapotranspiration, Arizona, Catchment, Climatic Water Deficit, Colorado, All tags... Dissolved-solids model, Excess Water, Geologic Formation, Geology, Groundwater Recharge, Hydrologic network, New Mexico, Potential Evapotranspiration, Precipitation, Runoff, SPARROW, Snowfall, Snowmelt, Snowpack, Soil Water Storage, Sublimation, USGS Science Data Catalog (SDC), Upper Colorado River Basin, Utah, Water Resources, Watershed, Wyoming, geoscientificInformation, inlandWaters, Fewer tags Predicted minimum flow coefficient of variation (CV) for small streams in the Upper Colorado River Basin under historic hydrologic conditions. Our objective was to model minimum flow coefficient of variation (CV) on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a random forest modeling approach to model the relation between minimum flow CV (the standard deviation of annual minimum flows times 100 divided by the mean of annual minimum flows) on gaged streams (115 gages) and environmental variables.... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags Predicted mean annual number of zero-flow days of small streams in the Upper Colorado River Basin based on historic flow data Our objective was to model mean annual number of zero-flow days (days per year) for small streams in the Upper Colorado River Basin under historic hydrologic conditions on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a random forest modeling approach to model the relation between zero-flow days per year on gaged streams (115 gages) and environmental variables.... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags Water quality in shallow alluvial aquifers, Upper Colorado River Basin, Colorado, 1997 Shallow ground water in areas of increasing urban development within the Upper Colorado River Basin was sampled for inorganic and organic constituents to characterize water-quality conditions and to identify potential anthropogenic effects resulting from development. In 1997, 25 shallow monitoring wells were installed and sampled in five areas of urban development in Eagle, Grand, Gunnison, and Summit Counties, Colorado. The results of this study indicate that the shallow ground water in the study area is suitable for most uses. Nonparametric statistical methods showed that constituents and parameters measured in the shallow wells were often significantly different between the five developing urban areas. Radon... Categories: Publication; Types: Citation, Journal Citation; Tags: Colorado, Journal of the American Water Resources Association, Upper Colorado River Basin, ground water, land use, All tags... water quality, Fewer tags UCRB SWB Model Results - Projected Climate Data - Monthly Results by Sub-Basin This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. This dataset comprises SWB model results from runs using projected climate data, summarized by sub-basin on a monthly basis, and there are 4 separate datafiles associated with this Data Release: 1. SWB model results for actual evapotranspiration (AET), summarized by sub-basin on a monthly basis from 1950 through 2099 2. SWB model results for potential evapotranspiration (PET), summarized... Categories: Data; Types: Citation; Tags: Upper Colorado River Basin, climate change, groundwater recharge Five Hundred Years of Hydrological Drought in the Upper Colorado River Basin This article evaluates drought scenarios of the Upper Colorado River basin (UCRB) considering multiple drought variables for the past 500 years and positions the current drought in terms of the magnitude and frequency. Drought characteristics were developed considering water-year data of UCRB’s streamflow, and basin-wide averages of the Palmer Hydrological Drought Index (PHDI) and the Palmer Z Index. Streamflow and drought indices were reconstructed for the last 500 years using a principal component regression model based on tree-ring data. The reconstructed streamflow showed higher variability as compared with reconstructed PHDI and reconstructed Palmer Z Index. The magnitude and severity of all droughts were... Categories: Publication; Types: Citation, Journal Citation; Tags: Journal of the American Water Resources Association, Palmer Z index, Palmer hydrological drought index, Upper Colorado River Basin, dendrochronology, All tags... drought, planning, streamflow, Fewer tags Predicted hydrology (intermittency) of a given stream reach under drier climate conditions in the Upper Colorado River Basin Our objective was to model the risk of becoming intermittent under drier climate conditions on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a conditional inference modeling approach to model the relation between intermittency status on gaged streams (115 gages) and selected mean and minimum flow metrics. We then projected intermittency status and if a stream... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags Collection of an adult gizzard shad (Dorosoma cepedianum) from the San Juan River, Utah Used first paragraph of article as the abstract: We collected an adult gizzard shad (Doro- soma cepedianum) from the San Juan River just upstream of Lake Powell, Utah, on 6 June 2000. This represents the first documented occurrence of the species in the Colorado River or its tributaries. The adult male (35 cm TL, 470 g) was taken by trammel net from a small (0.5 ha), shallow (<2 m) backwater along with several other fish that included 3 endan- gered razorback sucker (Xyrauchen texanus). The specimen is stored at the Museum of Southwestern Biology, University of New Mexico, Albuquerque (curation number 49122). Published in Western North American Naturalist, volume 64, issue 1, on pages 135 - 136, in 2004. Categories: Publication; Types: Citation, Journal Citation; Tags: Dorosoma cepedianum, Upper Colorado River Basin, Western North American Naturalist, gizzard shad, range expansion Predicted specific mean daily flow of small streams in the Upper Colorado River Basin based on historic flow data Our objective was to model specific mean daily flow (mean daily flow divided by drainage area [cubic feet per second per square mile]) on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate.We used a random forest modeling approach to model the relation between specific mean daily flow on gaged streams (115 gages) and environmental variables. We then projected specific mean... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags Predicted specific minimum flow of small streams in the Upper Colorado River Basin based on historic flow data Our objective was to model specific minimum flow (mean of the annual minimum flows divided by drainage area [cubic feet per second per square mile]) on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a random forest modeling approach to model the relation between specific minimum flow on gaged streams (115 gages) and environmental variables. We then projected... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags Predicted 7-day minimum flow of small streams in the Upper Colorado River Basin based on historic flow data Our objective was to model 7-day minimum flow (mean of the annual minimums of a 7-day moving average for each year [cubic feet per second]) on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a random forest modeling approach to model the relation between 7-day minimum flow on gaged streams (115 gages) and environmental variables. We then projected 7-day minimum... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags UCRB SWB Model Results - Projected Climate Data - Water Years 1951-2099 This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. This dataset comprises SWB model results from runs using projected climate data, summarized by water year, and there are 4 separate datafiles associated with this Data Release: 1. SWB model results for actual evapotranspiration (AET), summarized by water year from 1951 through 2099 2. SWB model results for potential evapotranspiration (PET), summarized by water year from 1951 through... Categories: Data; Types: Citation; Tags: Upper Colorado River Basin, climate change, groundwater recharge Generalized 1:500,000-scale geology of the Upper Colorado River Basin This generalized geology dataset was developed as input to a total dissolved solids Spatially Referenced Regressions on Watershed Attributes (SPARROW) model for the Upper Colorado River Basin (UCRB; Kenney and others, 2009) and for a more recent update to that model. The largest source of naturally generated dissolved solids in streams of the UCRB is the rocks underlying stream basins, particularly rocks high in dissolvable minerals. For the purposes of modeling, the scale of the geologic dataset optimally should be similar to the scale of the stream-catchment network used in the model but simplified to reduce the number of geologic units represented in the data. This dataset was developed to meet both scale and... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arizona, Colorado, Geologic Formation, Geology, New Mexico, All tags... Upper Colorado River Basin, Utah, Wyoming, geoscientificInformation, inlandWaters, Fewer tags Predicted frequency of low-flow pulse events for small streams in the Upper Colorado River Basin under historic hydrologic conditions. Our objective was to model frequency of low-pulse events on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate. We used a random forest modeling approach to model the relation between frequency of low-pulse events on gaged streams (115 gages) and environmental variables. We then projected frequency of low-pulse events to ungaged reaches in the Upper Colorado River Basin... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags UCRB SWB Model Results - Observed Climate Data - Water Years 1951-2010 This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. This dataset comprises SWB model results from runs using historical climate data, and there are 5 separate datafiles associated with this Data Release: 1. SWB model results for actual evapotranspiration (AET), summarized by water year from 1951 through 2010 2. SWB model results for potential evapotranspiration (PET), summarized by water year from 1951 through 2010 3. SWB model results... Categories: Data; Types: Citation; Tags: Upper Colorado River Basin, climate change, groundwater recharge Identification of Pacific Ocean sea surface temperature influences of Upper Colorado River Basin snowpack Given the importance of Upper Colorado River Basin (UCRB) snowpack as the primary driver of streamflow (water supply) for the southwestern United States, the identification of Pacific Ocean climatic drivers (e.g., sea surface temperature (SST) variability) may prove valuable in long-lead-time forecasting of snowpack in this critical region. Previous research efforts have identified El Ni�o?Southern Oscillation (ENSO) and Pacific Decadel Oscillation (PDO) as the main drivers for western U.S. snowpack, but these drivers have limited influence on regional (Utah and Colorado) UCRB snowpack. The current research applies for the first time the Singular Value Decomposition (SVD) statistical method to Pacific Ocean SSTs... Categories: Publication; Types: Citation, Journal Citation; Tags: American Geophysical Union, Upper Colorado River Basin, Water Resources Research, climate, multivariate statistics, All tags... sea surface temperatures, snowpack, Fewer tags Selected Basin Characterization Model Parameters for the Upper Colorado River Basin These data are derived from the Basin Characterization Model (BCM) and used as input to a total dissolved solids SPARROW model for the Upper Colorado River Basin. The BCM mechanistically models the pathways of precipitation into evapotranspiration, infiltration into soils, runoff, or percolation below the root zone to recharge groundwater (Flint and others, 2013). The dataset is composed of twelve, 270-meter resolution raster layers representing mean total annual values for water years 1985 - 2012 of actual evapotranspiration (aet), climatic water deficit (cwd), excess water (exc), snowmelt (mlt), snowpack (pck), potential evapotranspiration (pet), precipitation (ppt), recharge (rch), runoff (run), sublimation (sbl),... Types: Citation; Tags: Actual Evapotranspiration, Arizona, Climatic Water Deficit, Colorado, Excess Water, All tags... Groundwater Recharge, New Mexico, Potential Evapotranspiration, Precipitation, Runoff, Snowfall, Snowmelt, Snowpack, Soil Water Storage, Sublimation, Upper Colorado River Basin, Utah, Wyoming, geoscientificInformation, inlandWaters, Fewer tags Predicted intermittency of small streams in the Upper Colorado River Basin based on historic flow data Our objective was to model intermittency (perennial, weakly intermittent, or strongly intermittent) on small, ungaged streams in the Upper Colorado River Basin. Modeling streamflows is an important tool for understanding landscape-scale drivers of flow and estimating flows where there are no gaged records. We focused our study in the Upper Colorado River Basin, a region that is not only critical for water resources but also projected to experience large future climate shifts toward a drier climate.We used a random forest modeling approach to model the relation between intermittency on gaged streams (115 gages) and environmental variables. We then projected intermittency status to ungaged reaches in the Upper Colorado... Types: Citation; Tags: Random forests, Streamflow, Streamflow modeling, Ungaged streams, Upper Colorado River Basin, All tags... Upper Colorado River Basin, Fewer tags