WATER LINES: Denver-West Slope water agreement finally final | PostIndependent.com
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WATER LINES: Denver-West Slope water agreement finally final

Hannah Holm
WATER LINES
Free Press Weekly Columnist

Denver can take a little more water from the Colorado River’s headwaters to increase the reliability of its system, but won’t develop any new transmountain diversions without West Slope agreement and will help repair damage from past diversions.

Those are some of the key provisions in the Colorado Cooperative Agreement between Denver Water and 42 West Slope water providers and local governments from the Grand Valley to Grand County.

The Colorado Cooperative Agreement covers a whole suite of issues related to Denver’s diversion of water from the Fraser and Blue River drainages, tributaries to the Colorado River. In October, with little fanfare, this historic agreement received its final signatures and was fully executed. It took five years of mediation and nearly two years of ironing out the details with state and federal agencies, against a backdrop of decades of litigation, to get to this point.



According to material from the Colorado River District’s latest quarterly meeting, the agreement, “is the direct result of Denver Water’s desire to expand its Moffat Tunnel transmountain water supply from the Fraser River in Grand County and to enlarge Gross Reservoir in Boulder County.” This project is expected to divert, on average, approximately 18,000 acre feet/year of water beyond the average of 58,000 acre feet/year it already diverts, which amounts to about 60% of the natural flow in the Fraser River at Winter Park.

Under the agreement, the West Slope parties agreed not to oppose the increased Moffat Collection System diversions, and Denver Water agreed not to expand its service area and not to develop new water projects on the West Slope without the agreement of the resident counties and the Colorado River District. The agreement also includes dozens of other provisions designed to limit water demands in Denver and address water quality and flow conditions in the Colorado River and its tributaries. Here’s a sampling:



Denver will contribute both water releases and several million dollars for a “learning by doing” project to improve aquatic habitat in Grand County. The project will be managed by representatives from Denver Water, Grand County, Colorado Parks and Wildlife, Trout Unlimited and other water users.

Denver will not exercise its rights to reduce bypass flows from Dillon Reservoir and its collection system in Grand County during droughts unless it has banned residential lawn watering in its service area.

Diversions and reservoirs operated by both Denver Water and West Slope parties will be operated as if the Shoshone hydroelectric power plant in Glenwood Canyon were calling for its (very senior) water right, even at times when the plant is down. This is important for recreational and environmental flows in the river, as well as for junior water users downstream from plant.

Denver Water will pay $1.5 million for water supply, water quality or water infrastructure projects benefiting the Grand Valley, and $500,000 to offset additional costs for water treatment in Garfield County when the Shoshone call is relaxed due to drought conditions.

A similar agreement is under development between West Slope entities and Northern Water, which currently diverts about 220,000 acre feet/year of water from the Upper Colorado River to the Front Range through the Colorado Big Thompson Project. Like the Colorado Cooperative Agreement, the Windy Gap Firming Project Intergovernmental Agreement trades West Slope non-opposition to increased transmountain diversions for mitigations to address the impacts of both past and future stream depletions.

Both the Colorado Cooperative Agreement and the Windy Gap Firming Project Intergovernmental Agreement have been hailed as models of cooperation. Meanwhile, East Slope – West Slope tensions continue to mount over how the Colorado Water Plan, currently under development, should address the possibility of additional diversions of water from the West Slope to meet growing urban demands on the Front Range. These agreements demonstrate that such tensions can be overcome, but also that it could take more time than allowed by the 2015 deadline Gov. Hickenlooper has set for completion of the Colorado Water Plan.

Full details on the Colorado Cooperative Agreement can be found on the River District’s website, under “features” at http://www.crwcd.org/. More information on the Colorado Water Plan can be found at http://coloradowaterplan.com/.

Water Lines is a series of articles coordinated by the Water Center at Colorado Mesa University in cooperation with the Colorado and Gunnison Basin Roundtables to raise awareness about water needs, uses and policies in our region. To learn more about the basin roundtables and statewide water planning, and to let the roundtables know what you think, go to http://www.coloradomesa.edu/WaterCenter. You can also find the Water Center on Facebook at /WaterCenter.CMU or Twitter @WaterCenterCMU. Hannah Holm is coordinator of the Water Center at Colorado Mesa University.


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