Web Services

The HBGuest and Surface Water Conditions web services are deprecated as of July 1st 2018 and will no longer be available after October 1st 2018.

Deprecation means the HBGuest and Surface Water Conditions web services are no longer being actively developed or supported. These web services will be retired on October 1st 2018. As a result we recommend and encourage you to move to the new Colorado Division of Water Resources REST Web Services, which are actively supported and developed. 


The list of current Colorado Division of Water Resources REST Web Service data element are listed here. The Tech Info/Help documentation is here.

There are two web services tools that allow applications to access data without navigating web pages.

  • HBGuest Web Service:  HBGuest Web Service provides HydroBase Online data in a standard published format for software applications. For example, historical diversion time series can be accessed using the ColoradoWaterHBGuest input type in TSTool, a stand alone data querying tool. This Web Service, which is provided and maintained by DWR, can be accessed from the DWR Website.

    Common Use:
  • Download HydroBase Online data for modeling and analysis
  • Surface Water Conditions Web Service:  Surface Water Conditions Web Service provides real-time satellite monitoring system (ColoradoWaterSMS) data a standard published format for software applications. For example, real-time time series can be accessed using the ColoradoWaterSMS input type in TSTool. This Web Service, which is provided and maintained by DWR, can be accessed from the DWR Website.

    Common Use:
  • Download ColoradoWaterSMS data for modeling and analysis