Tara A. Gross 20260422 raster digital data Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9Q5AMFV Michael S. Kohn M. Alisa Mast Tara A. Gross 2026 publication Scientific Investigations Report 20255047 Reston, VA U.S. Geological Survey https://doi.org/10.3133/sir20255047 The U.S. Geological Survey, in cooperation with the Colorado Department of Transportation, developed peak-, mean-, and low-streamflow regional-regression equations for natural streamflow in central and western Colorado. This data release includes geographic information systems data and hydrologic data through water year 2019 that were compiled, processed, and analyzed for this peak-, mean-, and low-streamflow study. This child page includes raster datasets representing basin and climate attributes within central and western Colorado and are served in the Colorado StreamStats application to describe delineated basins. The StreamStats application provides access to spatial analytical tools that can be useful for water-resources planning and management, and for engineering and design purposes. The map-based user interface can be used to delineate drainage areas, get basin characteristics, and estimates of flow statistics, and more. The purpose of this data release is to present data that were used to update regional-regression equations for estimating peak, mean, and low streamflows for use in central and western Colorado. The raster datasets were created for incorporation into the U.S. Geological Survey Colorado StreamStats application to describe delineated basins. These data are stored in 6 .zip files. The following list details a crosswalk table between raster files and the .zip files that they are stored in: .Zip file name - size, .Zip contents DEM.zip - 29.0 GB (31,174,671,253 bytes), dem PRISM.zip - 761 MB (798,609,003 bytes), prism_aug slope.zip - 36.9 GB (39,680,503,211 bytes), slope_pct 100year_6hour_precip.zip - 467 MB (489,972,981 bytes), 100y6h 100year_24hour_precip.zip - 472 MB (495,168,446 bytes),4654 100y24h SNODAS.zip - 63.6 MB (66,716,801 bytes), s0401_34 1973 2019 publication date Complete None planned -111.5847 -99.3963 43.1328 35.0733 ISO 19115 Topic Category geoscientificInformation None NED elevation slope precipitation PRISM SNODAS NOAA dem USGS Metadata Identifier USGS:6439a1f9d34ee8d4ade21be4 Common geographic areas Colorado Wyoming Utah Arizona New Mexico Oklahoma Nevada Kansas No access constraints. Please see 'Distribution Information' for details. These data are marked with a Creative Common CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Tara A Gross U.S. Geological Survey, ROCKY MOUNTAIN REGION IT Specialist mailing address

Mail Stop 415, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-6933 303-236-4912 tgross@usgs.gov These datasets are produced by the U.S. Geological Survey (USGS) in cooperation with the Colorado Department of Transportation. All rasters are provided in GRID format and may be opened using ESRI or other geographic information system software. ESRI ArcMap version 10.7.1 was used for all data processing. U.S. Geological Survey 2018 raster digital data https://nationalmap.gov/elevation.html Northwest Alliance for Computational Science and Engineering, PRISM Climate Group 2012 publication https://www.prism.oregonstate.edu/normals/ National Oceanic and Atmospheric Administration 2011 publication https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html National Oceanic and Atmospheric Administration 2013 publication https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html National Oceanic and Atmospheric Administration 1973 publication https://www.weather.gov/owp/hdsc_noaa_atlas2 National Snow and Ice Data Center (NSIDC) 2023 raster digital data https://nsidc.org/data/g02158/versions/1 All datasets contain original values from published sources. Data were not modified from original sources. The data presented covers the required study area. A cell size of 10 or 30 meters was used for all datasets Vertical information is not included in these datasets U.S. Geological Survey 2018 raster digital data Reston, VA U.S. Geological Survey https://nationalmap.gov/elevation.html Digital and/or Hardcopy 2018 publication date NED 10-meter DEM source data Northwest Alliance for Computational Science and Engineering, PRISM Climate Group 2012 raster digital data https://www.prism.oregonstate.edu/normals/ Digital and/or Hardcopy 1980 2010 publication date PRISM August Mean Monthlies source data National Oceanic and Atmospheric Administration 2011 raster digital data https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html Digital and/or Hardcopy 2011 publication date Precipitation Frequency Data for Semi-arid Southwest source data National Oceanic and Atmospheric Administration 2013 raster digital data https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html Digital and/or Hardcopy 2013 publication date Precipitation Frequency Data for Midwestern States source data National Oceanic and Atmospheric Administration 1973 raster digital data https://www.weather.gov/owp/hdsc_noaa_atlas2 Digital and/or Hardcopy 1973 publication date Precipitation Frequency Data for Wyoming source data National Snow and Ice Data Center (NSIDC) 2023 raster digital data https://nsidc.org/data/g02158/versions/1 Digital and/or Hardcopy 2023 publication date SNODAS SWE for April 1 source data Source dataset(s) for each raster presented here were projected (and resampled where necessary) to match the projection, resolution (where appropriate), and origin coordinates needed to match the Colorado StreamStats application. Additional processing steps were included to process the SNODAS dataset. Please see the metadata file within the SNODAS.zip folder for more details. 2020 Raster Grid Cell 111226 91537 Universal Transverse Mercator 13 0.9996 -105 0 500000 0 coordinate pair 10 10 meters North American Datum of 1983 (NAD 83) Geodetic Reference System 1980 6378137.000000 298.257222 100y6h.zip Units for the NOAA Atlas 100-year, 6-hour precipitation frequency values are in inches. Gaps in the data are present due to climate stations that were not included in the NOAA Atlas analysis because they did not meet the requirements for continuous data for the period of record. Please see NOAA sources in the source citation information for further details about data gaps. User defined 100y24h.zip Units for the NOAA Atlas 100-year, 24-hour precipitation frequency values are in inches. Gaps in the data are present due to climate stations that were not included in the NOAA Atlas analysis because they did not meet the requirements for continuous data for the period of record. Please see NOAA sources in the source citation information for further details about data gaps. User defined NED.zip National Elevation data are provided in meters above NAVD 88. User defined PRISM.zip Annual precipitation from Oregon State Univerisity PRISM Group. Units for mean annual August precipitation is in millimeters. User defined Slope.zip The inclination of slope was calculated as percentage rise, also referred to as the percentage slope, based on individual cells in the DEM raster which held units of elevation in meters above North American Vertical Datum of 1988. User defined SNODAS.zip Snow data from the University of Colorado Snow Data Assimilation System (SNODAS) Data Products. Units for these data are in meters with a scale factor of 1000. User defined GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Digital Data https://doi.org/10.5066/P9Q5AMFV None 20260422 Tara A Gross U.S. Geological Survey, ROCKY MOUNTAIN REGION IT Specialist mailing address

Mail Stop 415, W 6th Ave Kipling St

Lakewood CO 80225 US 303-236-6933 303-236-4912 tgross@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998