CDSS is proud to be named a Bronze Winner of the 2018 Horizon Interactive Award
Modeling software, such as StateMod, helps water managers better manage our state's most precious resource.
Field and historical data combines to create a comprehensive, mapable dataset.
Online Data Search tools provide access to a wealth of Colorado Water Data.


Welcome to Colorado's Decision Support Systems!

In order to reduce the spread of COVID-19 (Coronavirus), the Department of Natural Resources (DNR) is doing its part through social distancing in the workplace. As of April 1, most of DNR's employees will work from home and its main office buildings will be closed to the public. However, the DNR and its agencies will remain open for business through phone or email to serve the people of Colorado. Please be patient and flexible during this unprecedented circumstance, and know that we will respond to customers as soon as possible.​ Click here for COVID-19 updates.   

Link Update - Please note that all links to CDSS search tools have been updated. Please make sure to update your bookmarks.

October 2021

The StateCU GUI has been updated to model version 14.0.1 and GUI version 8.0.2. Please see release notes for the new version here. Note that some old versions will no longer connect with the HydroBase wizard.


TSTool has been updated to version 14.0.1. Please see release notes for the new version here.


ArkDSS task memos and deliverables continue to be finalized and released. Please visit the ArkDSS page for access to these documents. 


Want to keep up with all the latest news about CDSS tools and technology? Sign up for our newsletter: choose the Tools and Technology list.  Missed the latest news? Get it here

CDSS provides a host of online tools that connect directly to HydroBase, the State's water data repository.

Download software tools for surface water, or groundwater modeling, processing time series data, and estimating consumptive use.

Calibrated baseline data sets for the water allocation model (StateMod) have been developed for each major river basin to support water supply and planning studies. Baseline data sets typically include scenarios for historical data (for the purpose of calibration) and for the current conditions (for planning purposes).

GIS layers include HydroBase Data such as points of diversion, wells, streams/rivers, stream gages, canals, and climate stations, irrigated acreage for various years, and other relevant layers.

The CDSS provides links to program related documents, such as project reports and information, technical memoranda, meeting materials, basin information, and publications.

Decision Support Systems have been developed for every basin in the State. Find general information about the basins, as well as basin reports developed for the DSS.


Work is underway on the Arkansas River Decision Support System (ArkDSS). There are five tasks under active development at this time:

1.Spatial System Integration (GIS)

2.Data Development for Consumptive Use and Surface Water Modeling

3.Consumptive Use Analysis and Modeling

4.Surface Water Analysis and Modeling

5.Administration and Accounting Tools

Task Memos and other data can be found on the ArkDSS page.

Software enhancements made during ArkDSS (primarily to StateMod, TSTool, and StateCU) are being developed under the OpenCDSS model. Under OpenCDSS, software source code will be publicly available in GitHUB - an open source, collaborative environment.

Check back for updates to ArkDSS, OpenCDSS, and other CDSS topics.