Water Resources for Colorado The USGS Colorado Water Science Center, your source for water-resource information collected and interpreted by the U.S. Geological Survey in Colorado.

The Colorado Division of Water Resources (DWR), administers water rights, issues water well permits, monitors streamflow and water use, assures the safe and proper construction of water wells, and maintains numerous databases of Colorado water information.

Community Collaborative Rain, Hail and Snow Network CoCoRaHS is an acronym for the . Each time a rain, hail or snow storm crosses your area, volunteers take measurements of precipitation from as many locations as possible. These precipitation reports are then recorded online.

Complete List of Water Supply Forecast Products, including Basin Outlook Reports, Snow Survey, Colorado Streamflow Forecast Maps, Historical 50% Exceedence Forecast, Colorado, Rio Grande & Arkansas River Basins Streamflow Forecast Maps.

Colorado Snow Survey Program – The NRCS Snow Survey Program provides mountain snowpack data and streamflow forecasts for the western United States. Common applications of snow survey products include water supply management, flood control, climate modeling, recreation, and conservation planning. 

• Colorado Snow Data

• Colorado Precipitation Data

• Colorado Water Supply Data

• Colorado Interactive Maps & Data Query Tools 

Track watershed health in the Boulder Creek and St. Vrain Creek basins 

Select Annual Reports below to access the 2023 Report, as well as previous reports. Select Monitoring Locations below to explore a map of the watersheds and monitoring locations, and see collected data by location on time series graphs. Click into Data Visualizations to access graphical trends of all the key parameters we monitor, upstream-to-downstream by basin, aggregated annually and monthly by year.