Moffat Collection System Project will impact forest surrounding existing Gross Reservoir

The dam that forms Gross Reservoir, located in the mountains west of Boulder. Photo: Brent Gardner-Smith/Aspen Journalism

From The Boulder Daily Camera (Charlie Brennan):

The Federal Energy Regulatory Commission is expected to rule early next year on what would be the biggest public works project in Boulder County history, exceeding the original construction of the Gross Reservoir Dam, which was completed in 1954.

The tree removal plan outlined in Denver Water’s FERC application states that all trees and their associated debris on about 430 acres along 12.5 miles of shoreline will have to be removed in the course of the expansion, which is envisioned as being completed by 2025.

Denver Water spokeswoman Stacy Chesney said the agency has estimated that “the density of the forest ranges from approximately 150 to 1,800 trees per acre. Based on these initial plans, we estimate up to 650,000 trees will need to be removed in the area surrounding Gross Reservoir.”

In a recent interview, Denver Water President Jim Lochhead vowed that every aspect of the project’s completion is being designed and executed with an eye toward mitigation of its impacts on the high country environment and those who depend on it for their recreation or call it home.

“We recognize that this is a major construction project and it has adverse impacts to the community,” said Lochhead, whose utility serves 1.4 million in Denver and many of its suburbs — but not Boulder County.

“We are trying to understand exactly what those impacts are, and see what the needs of the community are, and do everything we can to help address them.”

Referencing project manager Jeff Martin, Lochhead said, “Whether it’s traffic, hauling on the roads, whether it’s noise associated with the quarry, whether it’s the tree removal issues, it’s Jeff’s job to make sure it goes in a way that we’re doing the best that we can by the local community.”

Martin said: “We recognize the brutal aspects of the project. We don’t want to hide from those. That’s not our objective.”

Stressing that Denver Water intends to factor the concerns of reservoir neighbors into its planning of what’s officially known as the Moffat Collection System Project, Martin said, “We look forward to getting that feedback, seeing how we can make it into the most palatable project we can, and turn it into, maybe not reducing all the impacts, but for the greater good, reducing them as much as we can.”

[…]

A 48-page plan for the required tree removal prepared by Denver Water describes a mix of ponderosa pine, Douglas fir and Rocky Mountain juniper.

According to data the agency compiled in 2005, most of the trees at that time were 20 to 50 feet high, with a breast-high diameter ranging from 4 to 14 inches.

“Because of the topography, e.g., very steep slopes, rock outcrops, etc., several more complex tree removal (logging) systems will need to be used, and some temporary roads will need to be constructed to remove the trees,” the plan states.

It estimates that 50,000 tons of forest biomass are expected to be produced during the required clearing for the expansion of Gross Reservoir, which is to see its dam raised by 131 feet, expanding the reservoir’s capacity by 77,000 acre feet to a total storage capacity of 118,811 acre feet.

While noting that, “Traditionally, most of the slash would have been piled and burned in place,” the plan acknowledges that, “Today, burning large quantities of forest residue, in close proximity to residential areas, is problematic in the extreme.”

Allen Owen, Boulder District forester for the Colorado State Forest Service — a contracted forest resource management partner to Denver Water through the Forests to Faucets program — said he had been unaware of the number of trees Denver Water is planning to pull out of the Gross Reservoir area, or that it will involve the leveling of all growth on 430 acres of shoreline.

He doubts it would actually reach the 650,000 figure.

“That would mean 1,500 trees per acre over the entire 430-acre unit, and I know that’s not the case,” he said. “The stand densities vary all around the perimeter of the shoreline. There are areas that are nothing but solid rock, with no vegetation on it, to units that may have those number of trees. But there are not that many trees over the entire 430 acres. The number seems high.”

Owen expects state foresters will be involved in plotting how the trees’ removal proceeds.

“It’s something way beyond the ability of the Colorado State Forest Service,” he said. “I would consider that a big logging job, on very steep slopes, with very poor access. It is going to be very difficult, at best.”

Martin discussed three different potential scenarios, including removal by truck, burning and burial of felled lumber, or some combination of those strategies.

In cases where trees are located on small rock bluffs, Denver Water’s current removal plan notes, “the use of helicopter may be necessary.”

Denver Water believes new emerging technologies may pose options for removal that weren’t contemplated when its plan was authored.

“One of the things we’ve committed to is developing a process with public input … going out and getting some public input and some stakeholder input and that includes the U.S. Forest Service, the Colorado state forester and Boulder County, and developing some concepts … and then seeing what fits best for the community from there, and then moving forward with the plan,” Martin said…

Denver Water points to steps it is taking to mitigate the effects of construction wherever possible, and also emphasizes measures that it contends offers some in Boulder County a benefit. Lochhead and Martin touted the provision of a 5,000-square-foot environmental pool in the expanded reservoir, to be available for replenishing South Boulder Creek for the benefit of both Boulder and Lafayette at times when it is running dangerously low.

“That’s kind of a neat partnership there,” Lochhead said.

That does not mean that Boulder supports the Gross Reservoir expansion — but nor does it oppose it.

“Boulder has a neutral position on the overall expansion,” said Boulder’s source water administrator, Joanna Bloom.

“If the project somehow falls apart, then Boulder will continue to try to establish the streamflows on South Boulder Creek through other means,” Bloom said…

Boulder County’s stance on the expansion is more complicated.

The county filed extensive comments on both the draft and final environmental impact statements in the Army Corps of Engineers’ review process, and doesn’t agree that the EIS adequately addressed “the myriad of impacts” that would result for Boulder County and its citizens.

On March 23, the county filed an unopposed motion to intervene in the FERC approval process. One of the points the county addressed at length in that intervention relates to tree removal — and its arguments are based on the presumption of a far more modest, but still significant, removal of trees, at a total of 200,000.

“County roads (Flagstaff Road, Magnolia Road and others) are windy with low volume residential traffic and would be inappropriate for use by trucks hauling trees,” the county argued.

“In addition, it may not be possible to safely navigate SH 72 with trucks full of trees. These heavily laden trucks will cause damage to the roads and present safety concerns for road users.”

Moreover, the county contends Denver Water’s project must come through its land use review process, while the utility maintains that the county’s role is superseded by the FERC review process.

Until that conflict is resolved, the county is tempering its remarks, pro or con, on the Gross Reservoir project, so that it will not be seen as having prejudged any application Denver Water might make in the future through the county’s land review process.

Martin recalled that Denver Water worked extensively with Boulder County in 2012 exploring a potential intergovernmental agreement to facilitate the reservoir expansion.

While such a pact was ultimately rejected by Boulder County commissioners by a 3-0 vote, Martin said, “What we did receive was a lot of information from Boulder County and the public on how we need to shape the project in order to meet the needs of both the community and Boulder County.”

However, independent of the environmentalists’ planned federal lawsuit, there might be a need for another judge to sort out the critical question of whether Denver Water’s plans for tree removal and many other aspects of its reservoir expansion must pass through the county’s land use review process.

“I would say that it is likely that it will take litigation, because neither party is willing to give up its position,” said Conrad Lattes, assistant county attorney for Boulder County. “We need some neutral third party to decide this for us.”

However, on a warm and sunny day back before the chill of approaching winter descended on Colorado’s high country, Denver Water’s brass were flush with optimism.

Martin said that for Denver Water, it’s not just about getting the project done.

“We’re also looking at the social responsibility,” he said, “making sure that when it’s said and done, that we did it in the right way; that we could look back and say we did everything within reason and practicality to make this really the most environmentally, socially responsible project we can.”

Gross Dam enlargement concept graphic via Denver Water

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