The CWCB is the (non‐federal) sponsor of the Chatfield Reservoir Reallocation Project in cooperation with the U.S. Army Corps of Engineers (Corps) and water providers located in the South Platte River Basin.
A final Feasibility Report and Environmental Impact Statement was issued by the Corps that explains the project, its impacts, required mitigation work, and estimated project costs.
The fundamental concept of the project is to reallocate (convert) some of the existing storage space in the reservoir from flood control to multi-use and water supply purposes. A letter of approval and record of decision (ROD) from the Assistant Secretary of the Army (Civil Works) indicates that 20,600 acre-feet of storage space can be reallocated. That amount represents an ability to store more water up to twelve vertical feet above the current normal pool elevation of 5,432 feet. Modification to recreation facilities at the state park, along with key environmental mitigation work, will need to be completed before the additional storage is allowed to happen.
This project is just one of many solutions that will be needed now and into the future to assist with Colorado's projected water supply "gap". See CWCB SWSI 2010 report here.
Current status of water providers involved in the project as of October 2014:
-Centennial Water & Sanitation District
-Central Colorado Water Conservancy District
-Castle Pines Metro District
-Castle Pines North Metro District
-Town of Castle Rock
-Certain member entities of South Metro Water Supply Authority (SMWSA)
-Colorado Parks and Wildlife
-Colorado Water Conservation Board
-Center of Colorado Water Conservancy District
-Mt. Carbon Metro District
Relinquishment of storage space noticed or in progress:
- City of Aurora
- Roxborough Water & Sanitation District
- Denver Botanic Gardens at Chatfield
- Western Mutual Ditch Company
Change in Storage Space noticed or in progress:
- Central Colorado Water Conservancy District (acquire more)
- Town of Castle Rock (relinquish a portion)
- Mt. Carbon Metro District (acquire more)
- Certain member entities of SMWSA (mixed)
Note: The CWCB has had informal conversations with a number of non-participating entities who may be interested in obtaining storage space, and with participating entities who may want additional storage space. CWCB's goal is to hold and financially back the current "orphan shares" until such time that they are sold back in to the water community.