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. There are 4 separate datasets associated with this Data Release: 1. SWB model results from simulations run using observed climate data, summarized by water year from 1951 through 2010 2. SWB model results from simulations run using projected climate data, summarized by month and UCRB sub-basin from 1950 through 2099 3. SWB model results from simulations run using projected climate data, summarized by water year from 1951 through 2099 4. SWB model results from simulations run on climate data from 1981 through 2014 at ~800m, ~4km, and ~12km spatial scales.

This USGS Data Release represents Soil-Water Balance (SWB) groundwater infiltration modeling results for the Lower Colorado River Basin (LCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific data associated with USGS research efforts and publications available to the public. There are 3 separate groups of datasets associated with this Data Release: 1. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the LCRB within the United States 2. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the Grand Canyon region 3. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the alluvial basins of Arizona.

This USGS Data Release represents Soil-Water Balance (SWB) groundwater infiltration modeling results for the Lower Colorado River Basin (LCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific data associated with USGS research efforts and publications available to the public. There are 3 separate groups of datasets associated with this Data Release: 1. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the LCRB within the United States 2. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the Grand Canyon region 3. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the alluvial basins of Arizona.

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 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 4 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 for precipitation, summarized by water year from 1951 through 2010 4. SWB model results for recharge, summarized by water year from 1951 through 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 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 4 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 for precipitation, summarized by water year from 1951 through 2010 4. SWB model results for recharge, summarized by water year from 1951 through 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 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 by sub-basin on a monthly basis from 1950 through 2099 3. SWB model results for precipitation, summarized by sub-basin on a monthly basis from 1950 through 2099 4. SWB model results for recharge, summarized by sub-basin on a monthly basis from 1950 through 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 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 by sub-basin on a monthly basis from 1950 through 2099 3. SWB model results for precipitation, summarized by sub-basin on a monthly basis from 1950 through 2099 4. SWB model results for recharge, summarized by sub-basin on a monthly basis from 1950 through 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 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 2099 3. SWB model results for precipitation, summarized by water year from 1951 through 2099 4. SWB model results for recharge, summarized by water year from 1951 through 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 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 2099 3. SWB model results for precipitation, summarized by water year from 1951 through 2099 4. SWB model results for recharge, summarized by water year from 1951 through 2099

The Colorado River and its tributaries supply water to more than 35 million people in the United States and 3 million people in Mexico, irrigating more than 4.5 million acres of farmland, and generating about 12 billion kilowatt hours of hydroelectric power annually. Planning for the sustainable management of the Colorado River in future climates requires an understanding of the Upper Colorado River Basin groundwater system. The Upper Colorado River Basin, encompassing more than 110,000 square miles (mi2), contains the headwaters of the Colorado River and is an important source of snowmelt runoff to the River. Groundwater discharge also is an important source of water in the River and its tributaries, with estimates ranging from 21 to 58 percent of streamflow in the upper basin. A study by Castle and others (2014) using remotely sensed gravity observations from the NASA Gravity Recovery and Climate Experiment (GRACE) mission found that UCRB groundwater was depleted by more than 17 million acre-feet (ft) from December 2004 to November 2013. Understanding groundwater-budget components, including groundwater recharge, is important to sustainably manage both groundwater and surface-water supplies in the Colorado River Basin.