@NorthernWater is drawing down Horsetooth for Soldier Canyon Dam outlet works maintenance

Horsetooth Reservoir looking west from Soldier Dam. Photo credit: Northern Water.

From The Fort Collins Coloradoan (Jacy Marmaduke):

In all, Horsetooth dropped 32 feet between Aug. 1 and Sept. 13. The reason for the decrease is two-fold, according to reservoir manager Northern Water.

One reason for the level change is the approaching end of the irrigation season. Water users often didn’t need to take advantage of their water rights earlier in the summer, when storm clouds dropped rain on Northern Colorado several times a week.

But as the weather’s dried up, Northern Water has delivered more water to ditch companies for irrigation, spokesman Brian Werner said. The Poudre and South Platte Rivers are running lower now that snowpack has waned, so irrigation water is coming out of storage at Horsetooth.

The Soldier Canyon Dam is located on the east shore of Horsetooth Reservoir, 3.5 miles west of Fort Collins, Colorado. The zoned earthfill dam has an outlet works consisting of a concrete conduit through the base of the dam, controlled by two 72-inch hollow-jet valves. The foundation is limey shales and sandstones overlain with silty, sandy clay. Photo credit Reclamation.

The releases are also necessary because Northern Water is planning maintenance on the Soldier Canyon Dam outlet works in early November, Werner said. Lower water levels make it easier for divers to access dams for repairs.

Horsetooth stood at 5,391 feet on Wednesday morning, which is about average for this time of year, Werner said. On Aug. 1, Horsetooth’s elevation was 5,423 feet, or 7 feet below full…

Northern Water plans to draw down Horsetooth another 4 feet but will do so more gradually during the coming weeks, Werner said. The reservoir will probably reach more of an “equilibrium” between inflows and outflows this weekend, he added.

Colorado-Big Thompson Project east slope facilities

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