@Northern_Water turns dirt on Southern Water Supply Project

Southern Water Supply Project

From The Longmont Times-Call (Sam Lounsberry):

Work on the pipeline, known as phase two of the Southern Water Supply Project, is being overseen by Northern Water, which manages Carter Lake as part of the Colorado Big-Thompson Project.

Once complete, the pipeline will improve water quality and delivery reliability compared to the open, above-ground Boulder Feeder Canal that currently brings water from Carter Lake to Boulder Reservoir.

The new pipeline will pump 50 cubic feet per second of Colorado-Big Thompson and Windy Gap Project water, with Boulder receiving the bulk of the water among participants at the Boulder Reservoir Water Treatment plant, the pipeline’s terminus.

Boulder will receive 32 cubic feet per second and bear $32 million of the cost, according to city spokeswoman Gretchen King, while Left Hand Water District — which serves a 130-square-mile area between Longmont and Boulder — will receive 12 cubic feet per second and pay about $8 million for its share of the project…

Left Hand will have another $2 million of cost from the district’s addition of a hydroelectric generator at the intersection of the new Southern Water Supply pipeline and the entrance to the district’s Dodd Water Treatment Plant. The generator will produce enough power to satisfy about a third of the plant’s electricity need, according to district Manager Christopher Smith…

Berthoud and Longs Peak Water District — which serves Boulder and Weld County residents in an area north of Longmont — will each receive 3 cubic feet per second, but on Thursday officials from the town and district could not to provide their share of the costs of the remaining $4 million for the project.

Smith noted the pipeline, which has an estimated completion date of March 2020, will not only further protect water quality, but also will allow year-round water delivery to Left Hand Water District’s Dodd Water Treatment Plant…

“During some portions of the year the pipeline will act as the primary source of raw water for the participants in the project,” the Northern Water release states.

Currently, the Boulder Feeder Canal is offline from Oct. 31 to April 1 annually, Smith said. When the canal is down, so, too, is the Dodd Water Treatment Plant…

When the pipeline is complete, the Dodd Plant will be open year-round.

The first 12 miles of new pipeline, from Carter Lake to St. Vrain Road in Longmont, will parallel the existing Southern Water Supply Project pipeline, which was runs to Broomfield and was completed in 1999.

From St. Vrain Road, the new pipeline will continue south to the Boulder Reservoir Treatment Plant.

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