Ruedi Reservoir expected to fill, and maybe spill — @AspenJournalism #ColoradoRiver #COriver

The ungated spillway at Ruedi Dam and Reservoir, which automatically spills water into the lower Fryingpan River should the reservoir ever fill beyond its holding capacity of 102,373 acre-feet.

From Aspen Journalism (Brent Gardner-Smith):

Those who keep an eye on the lower Fryingpan River, below Ruedi Reservoir, may have noticed that the river’s flow increased this week in three distinct steps.

On Monday, the river was flowing steadily at just about 200 cubic feet per second.

On Tuesday, it stepped up to 250 cfs, and on Thursday, it took another 50 cfs jump, to 300 cfs.

And on Friday, the river jumped another 25 cfs, heading into the weekend flowing at about 325 cfs. (See USGS gage).

The increases in flow were directed by Tim Miller, a U.S. Bureau of Reclamation hydrologist who manages water levels in Ruedi and also manages water releases from the reservoir, which is about 14 miles above Basalt.

The water from the reservoir was being released through the dam’s outlet structures, as well as through the hydropower plant at the base the dam, into an area that’s popular with anglers, and large fish, and nicknamed the “Toilet Bowl,” due to its swirling waters.

Miller’s goal is to fill the reservoir by July 4, while avoiding overfilling the reservoir, which would cause water to flow over the dam’s spillway, which does not have a flow-controlling gate, as some spillways do.

The top of the ungated spillway at Ruedi Dam. Photo credit: Brent Gardner-Smith/Aspen Journalism

Balancing act

Miller is now balancing some factors beyond his control: the deep snowpack above Ruedi, lingering cold temperatures and varying flow levels in the transmountain diversions tunnels in the upper Fryingpan Basin.

On Friday, Ruedi was 64.6 percent full and holding 66,116 acre-feet of water, according to Reclamation. When full, the reservoir holds 102,373 acre-feet.

But, given the deep snowpack above Ruedi, Miller said “it’s very possible” the reservoir could spill, something that, to his knowledge, has only happened a few times since the reservoir and dam were completed in 1968.

The Ivanhoe snow-telemetry, or SnoTel, site above Ruedi, in the Ivanhoe Creek subbasin, is at 10,400 feet. The site shows there was still 54 inches of snow at that elevation Friday. That’s up from 42 inches a week ago but still below the March 14 peak of 90 inches.

“It just really depends on the weather,” Miller said of future releases into and out of Ruedi.

Peak runoff in the upper Colorado River basin within Colorado is now expected to arrive late, between June 15 and June 25, as more cool weather is in the forecast.

Once water reaches this point on the spillway on Ruedi Dam, it’s heading for the river some 285-feet below.

Not for flood control

Victor Lee, also a hydrologist with the Bureau of Reclamation, made a presentation on Ruedi and Green Mountain reservoirs Monday at the Colorado River Basin roundtable in Glenwood Springs.

He said he expected, because of the snowpack, to see above-average releases out of Ruedi as the reservoir fills and to see above-average diversions through the Boustead Tunnel, which sends water collected by the Fryingpan Arkansas Project diversion system under the Continental Divide to Turquoise Lake, near Leadville.

Since 1972, the Fry-Ark Project has diverted an average of 54,000 acre-feet a year through the Boustead Tunnel, but it’s expected to divert 84,000 acre-feet this year, according to Lee.

On Friday, the tunnel was sending east a relatively modest 38 cfs of water, but it had been sending about 300 cfs on May 17.

Lee also sounded a cautionary note about the rare prospect of Ruedi filling, spilling and sending at least 600 cfs of water down the lower Fryingpan.

“I have to stress that Ruedi is not a flood-control project, and if we get filled, there are no gates on the spillway to stop water from going,” Lee said. “And so, if we’re full, and we fill before peak runoff, there is always that chance that we would have excess flows beyond 600 cfs.”

Aspen Journalism covers rivers and water in collaboration with The Aspen Times. The Times published a version of this story on Saturday, May 25, 2019.

#Runoff news: Inflows to Blue Mesa Reservoir = ~200,000 acre-feet as of May 20, 2019

From The Vail Daily (Scott N. Miller) via The Aspen Times:

At the Eagle River Water & Sanitation District’s May 20 State of the River gathering, participants heard a presentation from Karl Wetlaufer, a hydrologist and assistant supervisor with the U.S. Department of Agriculture’s Natural Resources Conservation Service.

Wetlaufer talked about state and regional snowpack and provided some streamflow forecasts. The news was good on both topics.

It isn’t just the Eagle River drainage that’s had a good snow year. Across Colorado, the average “snow water equivalent” in the snowpack stands at 186 percent of the 30-year median. After the drought of 2018, that’s fantastic news.

According to Wetlaufer, Southern Colorado — the part of the state that most needed a big snow year — was the area where the snowpack is greatest. The snowpack in the San Juan, Dolores, Animas and San Juan River basins — closest to the Four Corners area — stood at 294 percent of the median on May 20.

Wetlaufer said that runoff so far has added about 200,000 acre feet of water to one of the state’s biggest reservoirs, Blue Mesa, near Gunnison. At the end of 2018, that reservoir was at its lowest level since 1984.

All the good news across the state is good news to local fishing guides and raft companies.

Sage Outdoor Adventures has a permit to raft Gore Creek through Vail. That didn’t happen last year. Cole Bangert of Sage said in an average year, the company can run raft trips through Vail for three or four weeks per season, mostly in June.

Bangert said he expects a longer season this year, due both to abundant snow and a slow melt so far.

Clear Creek Canyon via Bob Berwyn

From CBS 4 Denver (Michael Abeyta):

[Bruce Becker] says with all the snow we’ve been getting, water flow in the state’s rivers could be the highest we’ve seen since 2011 or 2013…

Add to that the cool start we’ve gotten to the season and conditions are almost perfect for a long and fun season…

Whitewater rafting and kayaking outfitters across the state hope Becker is right because last year’s hot dry summer and winter really hurt business.

“Our other outfitters in southwest Colorado practically had no season. My season on Clear Creek which is my main run was cut a month short and when you only have three months, losing one month hurts.”

On Sunday, a man was in Becker’s office booking a trip for late July. With folks already booking their trips months in advance, he is optimistic this summer on the river will be a good one for everyone.