Runoff/snowpack news: Good year to fill storage — if we had it to fill

June 10, 2014
Northern Integrated Supply Project via The Denver Post

Northern Integrated Supply Project via The Denver Post

From CBS Denver:

Flooding along the Cache La Poudre River damaged nearly two dozen homes and businesses in Greeley last week, and according to officials at the Northern Colorado Water Conservancy District, the Poudre River does not have any dams or reservoirs specifically for flood control. But there is an effort underway to change that.

The Poudre River is full of melted snow — so much so right now that levels are well above average in Larimer and Weld counties, spilling over banks, and flooding homes and businesses.

“We could fill a reservoir in a year like this,” Brian Werner with the Northern Colorado’s Water Conservancy District said.

He points out farmers’ irrigation dams inside the Poudre Canyon, but says water cannot be diverted to those to prevent flooding. He says there is no reservoir along the river because the idea was unpopular in the past.

“I think the general public is more aware when they see these flows and saying, ‘Boy, couldn’t we just store a little bit of that?’ Which is what this proposal does,” Werner said.

Northern Water wants to build two reservoirs off stream that could store water during high flow times. Planners estimate the project would cost $500 million, including $40 million to re-route Highway 287 to make room for Glade Reservoir, and build a smaller one north of Greeley…

But the federal approval process is moving slowly.

“We’ve been working on this in some form for over 20 years, taking some of the flood flows here on the Poudre and storing it,” Werner said.

They do expect to get some news on the status of studies being conducted on the project by the end of this year. It’s unlikely building would start before 2018.

From the Fort Collins Coloradoan (Ryan Maye Handy):

Several of the reservoirs that feed Northern Colorado are full, or approaching overfull, said Brian Werner, a spokesman for the Northern Colorado Water Conservancy District, which helps manage the reservoirs. Carter Lake, southwest of Loveland, is full, and Lake Granby near Rocky Mountain National Park is about to overflow, Werner added.

“We wouldn’t have guessed that in a million years a year ago,” Werner said Tuesday. Only a month ago, it was fifty-fifty if the reservoir would spill. “Now it looks like it will spill.”

Horsetooth is just 2 feet shy of being full, the highest the reservoir has been in late May and early June in the past six years.

The reservoir can hold enough to submerge 156,735 football fields in a foot of water. As of June 3, Horsetooth was holding 154,480 acre-feet of water, putting it around 98.5 percent full, said Zach Allen, a spokesman for Northern Water.

But what happens if Horsetooth does get full? The answer, Werner said, is basically “nothing.”

“We can control all the inflows to Horsetooth,” he said. Flatiron Reservoir and the Big Thompson River feed Horsetooth, and Northern Water controls all the outflows and inflows to the reservoir; Horsetooth’s water level can’t get higher than Northern Water wants it to, Werner said…

Lake Granby, on the other hand, is fed with snowmelt straight from the mountains. It’s levels are uncontrollable, and it could spill over any day now, Werner said.

“You can’t control what nature is going to do” with Granby, he added…

Northern Water for years has pursued an expansion of its water storage capacity to take advantage of plentiful water years. The Northern Integrated Supply Project would build a reservoir larger than Horsetooth northwest of Fort Collins. The proposal has drawn opposition from environmental groups and is in a yearslong federal review of its potential environmental impacts expected to be released late this year…

Much of Northern Colorado’s snowpack, around 200 percent of normal levels after an early May snow, has yet to melt, which brings the potential for much more water to come down from the mountains in the coming weeks.

From email from Reclamation (Kara Lamb):

We have seen the water level at Green Mountain Reservoir rise to the spillway gates as snow melt runoff inflows continue to come into the reservoir. As a result, we were able to increase the release from the dam to the Lower Blue River by 300 cfs today [June 9], using the spillway.

We are now releasing 1800 cfs to the Lower Blue.

From email from Reclamation (Kara Lamb):

The weekend went pretty smoothly for runoff here on the east slope of the Colorado-Big Thompson Project. Thunderstorms boosted runoff to the Big Thompson River slightly with inflow into Lake Estes peaking early this morning around 721 cfs. But this is still a downward trend.

As a result, outflow through Olympus Dam to the Big Thompson Canyon dropped today down to about 125 cfs. As we move into the rest of the week, visitors to and residents of the canyon will continue to see nightly flows rise with snow runoff, enhanced some by rain runoff, just as they have seen for the past week.

Deliveries to the canal that feeds Horsetooth Reservoir have brought Horsetooth back up to full. Its water level elevation has been fluctuating within the top foot of its storage between 5429 and 5430 feet. With it back up near 5430, we have curtailed the canal to Horsetooth and increased the return of Big Thompson River water to the canyon at the canyon mouth using the concrete chute. By 5 p.m. this evening the chute should be running around 300 cfs.

The drop off in snowmelt runoff inflows will allow us to begin bringing some Colorado-Big Thompson Project West Slope water over again using the Alva B. Adams Tunnel. We anticipate the tunnel coming on mid-week and importing somewhere between 200-250 cfs.

Once the tunnel comes back on, we will also turn the pump to Carter Lake back on, probably on Wednesday of this week. Carter’s water level elevation dropped slightly during runoff operations. It is around 95% full. Now that Horsetooth is basically full, Carter will receive the C-BT water. Turning the pump back on to Carter means residents around and visitors to the reservoir will see it fill for a second time this season.

Pinewood Reservoir, between Lake Estes and Carter Lake, is seeing a more typical start to its summer season. It continues to draft and refill with power generation as it usually does this time of year. This is also true for Flatiron Reservoir, just below Carter Lake and the Flatiron Powerplant. Both are expected to continue operating this way through June.

That is the plan we anticipate the East Slope of the C-BT to follow the rest of this week, June 9-13. We will post information if there is a major change; but as it stands now, I do not plan on sending an update again until next Monday. The state’s gage page is always available for those wishing to continue watching the water on a daily basis.

From The Crested Butte News (Toni Todd):

Word on the street this spring was that Blue Mesa Reservoir would be bursting at its banks this summer. Predictions were based on official and unofficial reports of above-normal river flows. However, a 2012 Environmental Impact Statement (EIS) has changed how local dams are operated in wet years, in deference to endangered fish species downstream. This new operational protocol will preclude the reservoir from filling this year.

“The reservoir is now only scheduled to reach a maximum storage of around 80 percent capacity in 2014,” said Upper Gunnison River District manager Frank Kugel. The U.S. Bureau of Reclamation (BOR) began blasting water through Blue Mesa Dam last week, with simultaneous releases happening at Morrow Point and Crystal Reservoirs, a trifecta of water storage and management that makes up what’s known as the Aspinall Unit.

The Record of Decision (ROD) states, “The EIS modifies the operations of the Aspinall Unit to provide sufficient releases of water at times, quantities, and duration necessary to avoid jeopardy to endangered fish species and adverse modification of their designated critical habitat while maintaining and continuing to meet authorized purposes of the Aspinall Unit.”

Given this new norm of operations adapted by the bureau during wet years, will Blue Mesa ever fill again?

“That’s a valid question, since the reservoir often does not fill in dry years due to lack of supply, and now with the Aspinall EIS, it will have trouble filling in wet years,” said Kugel.

“We all signed onto this because we agreed it’s important to save these fish,” said Colorado Fish and Wildlife Aquatic Species coordinator Harry Crocket.

According to the BOR’s website, an update written by hydraulic engineer Paul Davidson, unregulated inflow to Blue Mesa is 126 percent of normal this year, April through July. That’s 850,000 acre-feet of water entering the lake during the runoff months. “This sets the senior Black Canyon Water Right call for a one-day spring peak flow of 6,400 cfs, the Aspinall 2012 ROD target at a 10-day peak flow of 14,350 cfs… Reclamation plans to operate the Aspinall Unit to meet both the water right and ROD recommendations,” said Davidson.

The Colorado pike minnow, bonytail chub, humpback chub and razorback sucker are the fish that stand to benefit. The big flows are expected to improve the fishes’ critical habitat, at a time when the fish will be looking to spawn. Water will inundate otherwise shallow or dry riverbank areas, creating calm, sheltered spots for hatchlings, and heavy flows will wash the larvae into those areas.

The Gunnison River, said Crocket, was “mostly omitted” from the EIS as critical habitat. However, he said, “Historically, it was home to at least a couple of these species.”

“It’s a highly migratory fish,” Crocket said of the Colorado pike minnow. “It’s adapted to this big river system.”

It’s a system irrefutably changed by humans. Critical habitat for the Colorado pike minnow includes 1,123.6 miles of river, to include stretches of the Green, Yampa and White rivers, from Rifle to Glen Canyon, and the Yampa River to its confluence with the Colorado River.

“They [US Fish and Wildlife] did designate critical habitat [from the mouth of the Gunnison] to the Uncompahgre confluence [at Delta],” Crocket said.

The Colorado pike minnow called the Gunnison River home through the 1960s. “After that,” said Crocket, “it blinked out. It’s not been possible for it to be re-colonized.” A new fish passage at the Redlands structure, two miles upriver from the Gunnison-Colorado River confluence at Grand Junction, allows fish to make their way around the barrier and upstream, marking the first time in more than 100 years for those downstream fish to gain passage to the Gunnison.

Meanwhile, upstream, a form of collateral damage resulting from the big water releases at Blue Mesa worries Fish and Wildlife personnel. The number of fish sucked into and blown out through the dam is staggering. The technical term for this is entrainment.
“Bigger water years mean more water through the dam, and more fish entrained,” said Gunnison area Colorado Fish and Wildlife aquatic biologist Dan Brauch. “Certainly, loss of kokanee with those releases is a concern.”

From the Vail Daily (Randy Wyrick):

Water levels and snowpack are 121 percent of normal, with as much as 40 percent yet to melt at some higher elevation areas, according to Snotel data…

Snow water equivalent at the Fremont Pass Snotel site, the headwaters of the Eagle River, had 15.1 inches of snow water equivalent on Friday morning still to melt and run into the river. It hit 17 inches on March 18 and kept piling up until May 17 when it peaked at 25.6 inches. It usually doesn’t melt out until June 18, Johnson said.

Streamflow on the Eagle River in Avon may have peaked on May 30, when the daily mean discharge was 4,110 cubic feet per second, which was 249 percent of median for that date. Thursday’s daily mean discharge was 3,650 cfs, 197 percent of normal for Wednesday.

Gore Creek in Lionshead may have peaked June 4.

“Having 20 to 40 percent of the total snowpack remaining in higher elevations in the Colorado Basin is good overall. It should help sustain streamflows through the month,” [Diane Johnson] said…

Copper Mountain still has 4.1 inches of snow water equivalent. That would normally be melted out by now, Johnson said…

Reservoir storage in the state is running 95 percent of normal and 62 percent of capacity. That, however, depends on where you are.


Green Mountain Reservoir operations update #ColoradoRiver

April 27, 2014
Colorado River Basin in Colorado via the Colorado Geological Survey

Colorado River Basin in Colorado via the Colorado Geological Survey

From email from Reclamation (Kara Lamb):

Work at Green Mountain Dam has wrapped up and it is time to start increasing releases again. Here is the schedule for bumping up over the weekend and Monday. By Monday afternoon, we should be releasing about 900 cfs to the Lower Blue River.

Saturday, April 26, 2014
5:00 p.m. – Increase the reservoir release from 550 cfs to 600 cfs.
10:00 p.m. – Increase the reservoir release from 600 cfs to 650 cfs.

Sunday, April 27, 2014
5:00 p.m – Increase the reservoir release from 650 cfs to 700 cfs.
10:00 p.m. – Increase the reservoir release from 700 cfs to 750 cfs.

Monday, April 28, 2014
7:00 a.m. – Increase the reservoir release from 750 cfs to 800 cfs.
11:00 .m. – Increase the reservoir release from 800 cfs to 850 cfs.
4:00 p.m. – Increase the reservoir release from 850 cfs to 900 cfs.


“…the waterways of Grand County have become the poster child for aquatic death by a thousand cuts” — Allen Best #ColoradoRiver

April 20, 2014
Denver Water's collection system via the USACE EIS

Denver Water’s collection system via the USACE EIS

Another independent journalist covering water issues is Allen Best purveyor of The Mountain Town News. Here’s an analysis of the recent agreement between Denver Water, Trout Unlimited, and Grand County for operating the Colorado River Cooperative agreement. Here’s an excerpt:

Located at the headwaters of the Colorado River, the waterways of Grand County have become the poster child for aquatic death by a thousand cuts…

Called the Mitigation and Enhancement Coordination Plan, the agreement between Denver Water, Grand County, and Trout Unlimited proposes to govern Denver’s incremental diversions through the Continental Divide known as the Moffat firming project. However, according to the architects of the deal, it should also serve as a model in the ongoing dialogue as Colorado’s growing metropolitan areas look to squeeze out the final drops of the state’s entitlements to the Colorado River, as defined by the Colorado River compact of 1922 and other compacts.

“It is a demonstration of a new way of doing business that should be a model as Colorado talks about meeting its water gaps (between demands and supplies),” says Jim Lochhead, chief executive of Denver Water.

“Instead of platitudes or politics or parochialism, you need to do it by sitting down and working together and dealing with the issues,” he adds…

There are skeptics, unable to explain this strange alchemy in which a river can in any way benefit from having less water, as the agreement insists can be the case.

Among those withholding enthusiasm is Matt Rice, the Colorado coordinator for American Rivers. He points out that the agreement covers just 4 of the 32 creeks and streams trapped by Denver Water in the Fraser Valley and the adjoining Williams Fork. Too, like too many other similar programs, the data collection begins after permits are awarded, not before, which he thinks is backward.

In short, while Denver is careful to talk about “enhancements,” he thinks it falls short of addressing full, cumulative impacts.

Cumulative impacts are likely to be a focal point of federal permitting. While the Environmental Protection Agency is likely to have a voice, the vital 404 permit must come from the U.S. Army Corps of Engineers. The parties to the new agreement have asked that their agreement be incorporated into the permit…

A far greater financial cost to Denver specified by the agreement is the agency’s commitment to forfeit up to 2,500 acre-feet annually of the city’s added 18,700 acre-foot take.

Based on the firm yield of the water and Denver’s rate for outside-city raw water to customers, this commitment is valued at $55 million.

Denver will make this water available for release into the creeks and rivers, to keep water temperatures colder and hence more hospitable to insects and fish. The water can also be used for flushing, to mimic what happens naturally during spring runoff, scouring river bottoms, to clear out the silt that clogs the spaces between rocks where mayflies and other insects live – and upon which fish feed…

A final environmental impact statement from the U.S. Army Corps of Engineers is expected in late April. The federal agency can also impose conditions of its own making. They would be included in a record-of-decision, which is expected to be issued in late 2015.

A permit from the Colorado Department of Health and Environment is also needed. Boulder County insists it also has say-so over enlargement of Gross Reservoir, an assertion contested by Denver Water.

In addition, the Federal Energy Regulatory Commission must award a permit for revised hydroelectric generation at Gross.

At earliest, expansion of Gross could start in 2018 and be ready to capture spring runoff in 2022…

The agreement represents a new wave of thinking about impacts of water diversions. The older way of thinking was demonstrated in the Colorado Big-Thompson project. Financed by the federal government, it gave the Western Slope a one-time package, Green Mountain Reservoir, between Kremmling and Silverthorne, to serve Western Slope needs, particularly the farmers near Grand Junction who need water for late-summer fruits and produce. The agreement did not cover a more recent problem seemingly caused by the diversion, algae that obscure the clarity of Grand Lake.

The most recent of of the new agreements since the 1990s provides more living, breathing elasticity. The foundation for the new agreement was announced in 2011 but not finalized until recently. Called the Colorado River Cooperative Agreement, it sharply restricts Denver’s ability to develop new water sources on the Western Slope and also calls for Denver to provide both water and money to address problems in the Vail, Breckenridge and Winter Park areas.

Then, in 2012, came agreements addressing the ambitions by five cities along the northern Front Range to increase the take of spring flows at Windy Gap, similar to what Denver wants to do at the Moffat Tunnel.

The Windy Gap settlement introduced adaptive management, an idea gaining favor in management of rivers of the West for several decades. The essential idea of Learning by Doing, the program embraced for both Windy Gap and the Moffat projects, is that it’s impossible to know exactly what to do in advance…

“In the past, you’d build a project, do the required mitigation and move on. That’s no longer the case. Denver Water is committed to a new way of doing business – one that approaches water management in a way that is collaborative and as beneficial to West Slope interests as possible. The partnership we’ve created through Learning by Doing is permanent. Our commitment is t o work with Grand County, Trout Unlimited and all the partners in Learning by Doing in an ongoing manner permanently into the future.”

More Denver Water coverage here.


Green Mountain Reservoir operations update: Scaling back to 550 cfs by Monday #ColoradoRiver

April 18, 2014

greenmountainreservoir

From email from Reclamation (Kara Lamb):

We’ll be scaling back releases from Green Mountain over the weekend and then plan to maintain the lower release rate through next week. By Monday, April 21, we should be releasing about 550 cfs to the Lower Blue. The reduction in releases is due to some regularly scheduled maintenance. Property owners downstream of the dam have planned some channel work to correspond with the maintenance.

Releases will begin stepping back tomorrow, Saturday. We will go from 750 to 700 cfs around 8 p.m tomorrow evening. On Sunday, we will do two changes: the first at 4 p.m. from 700 to 650 cfs. The second around 10 p.m. from 650 to 600 cfs. On Monday, we will drop down one more time around 6 a.m. from 600 to 550 cfs.

Releases will go back up the following weekend of April 26.

More Green Mountain Reservoir coverage here.


Green Mountain Reservoir operations update: 710 cfs in the Blue River below the dam #ColoradoRiver

April 13, 2014

greenmountainreservoir

From email from Reclamation (Kara Lamb):

Currently, we are releasing about 710 cfs from the dam to the Lower Blue River. The reservoir is at a water level elevation of about 7890 feet–that’s roughly 60 feet below full, or roughly 38% of its total content.

You will see the reservoir water elevation continue to drop for about another month. The current snowpack above the Blue River Basin is around 140% of average for this time of year. I’ve been asked how this compares to snowpack numbers for the 2011 season on the Blue River. In 2011 in April we were closer to 150%. We continue to keep an eye on the snowpack conditions, fluctuating inflows, and the water level elevation and adjusting releases as necessary. It is likely the 710 cfs release rate will remain in place well into next week.

More Green Mountain Reservoir coverage here.


‘Denver-West Slope water agreement finally final’ — Glenwood Springs Post Independent #ColoradoRiver

December 4, 2013
Moffat Collection System Project/Windy Gap Firming Project via the Boulder Daily Camera

Moffat Collection System Project/Windy Gap Firming Project via the Boulder Daily Camera

From the Glenwood Springs Post Independent (Hannah Holm):

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/.

More Colorado River Cooperative Agreement coverage here.


Green Mountain Reservoir operations update: 250 cfs in the Blue River below the dam

July 13, 2013

greenmountainreservoir.jpg

From email from Reclamation (Kara Lamb):

Just a quick note to let you know that today [Friday] we bumped up releases to the Lower Blue to 250 cfs.

More Green Mountain Reservoir coverage here.


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