Study: Aspen looks at Woody Creek storage

A map provided by the city of Aspen showing the two parcels in Woody Creek it has under contract. The city is investigating the possibility of building a reservoir on the site, as well as looking at the possibility of a reservoir in the neighboring Elam gravel pit.

From The Aspen Daily News (Curtis Wackerle):

A preliminary feasibility study of water storage options using a Woody Creek parcel the city of Aspen is under contract to purchase contemplates first building a smaller reservoir at what’s now an adjacent gravel pit, followed by a phased expansion onto the land the city plans to acquire.

That is one of four scenarios subject to a geologic review and engineering analysis conducted this summer for the city by Deere and Ault Consultants. The options studied range in cost from an estimated $48 million to $81 million and could store between 320 and 8,000 acre-feet of water.

Aspen voters in November will decide whether to approve $3 million worth of general obligation bonds to finance the city’s purchase of the site, located on a bench above Upper River Road and owned currently by an entity called the Woody Creek Development Co., registered to a Fort Collins address.

The city in July announced it is under contract to purchase the main 56-acre parcel, located west of the Elam gravel pit, and a 1.9-acre plot closer to Upper River Road, for $2.65 million.

If voters reject the bonding question, a memo from the municipal utilities apartment recommends the city go forward with the purchase anyway, using another financing option…

The city is eyeing the land purchase as part of a potential solution to the vexing question of what to do about extensive water storage rights it has held for over 50 years on the upper reaches of Castle and Maroon creeks. The city’s application to extend those conditional water rights is pending in water court and is opposed by a host of other government agencies, environmental groups and private citizens. Settlement talks in the case are ongoing.

“These rights are located in alpine valleys and their development would involve difficult and expensive construction and likely cause significant environmental impacts,” says a memo from Margaret Medellin, the utilities portfolio manager, to city council in advance of a Tuesday work session on the topic. The memo asserts that “[the location] of the site allows for the legal movement of storage rights from Maroon and Castle creeks to a diversion point near the Woody Creek parcel.”

The Maroon and Castle reservoirs, which would involve dams over 100 feet tall in areas renowned for their scenic qualities, would create around 14,000 total acre-feet of water storage.

Some opposers in the water court case have questioned whether the city needs any water storage; it currently has none besides a small holding pond above the treatment plan, with all required water drawn directly from the creeks. City officials, on the other hand, say that if climate significantly alters snowpack patterns, storage could be needed in the future to keep up with demand. Exactly how much storage would be optimal is being studied by another city-hired consultant.

Deere and Ault contractors drilled four test borings and dug five test pits at the Woody Creek site; the work went forward without a permit, but after the fact and following up on a citizen complaint, Pitkin County, which has jurisdiction on the site, required the contractor to get a retroactive permit and file a revegetation plan.

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