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@rfconservancy: Join us next Thursday Sept 4th for our annual Carbondale Bicycle Ditch Tour

Aspinall unit operations update: 1100 cfs through the Gunnison Tunnel diversion

From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be reduced from 1800 cfs to 1600 cfs on Tuesday, August 26th at 4:00 PM. Flows in the lower Gunnison River are currently above the baseflow target of 1500 cfs. Significant rainfall has been occurring in the basin this week and the river forecast shows flows continuing to remain above the target for the 10 day forecast period.

Pursuant to the Aspinall Unit Operations Record of Decision (ROD), the baseflow target in the lower Gunnison River, as measured at the Whitewater gage, is 1500 cfs for August. For September, the baseflow target will be 1050 cfs.

Currently, diversions into the Gunnison Tunnel are 1100 cfs and flows in the Gunnison River through the Black Canyon are around 750 cfs. After this release change Gunnison Tunnel diversions will still be 1100 cfs and flows in the Gunnison River through the Black Canyon should be around 550 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

The Colorado River District, et al., are closely monitoring the settling of Ritschard Dam (Wolford Mountain) #ColoradoRiver

Ritschard Dam and Wolford Mountain Reservoir
Ritschard Dam and Wolford Mountain Reservoir

From the Sky-Hi Daily News (Lance Maggart):

Ritschard Dam impounds Wolford Mountain Reservoir, located on Muddy Creek just north of Kremmling. Construction on the Dam was completed in 1995 and falls under the auspices of the dam’s owners the Colorado River Water Conservation District.

Ritschard Dam is an earth-filled dam. As [Jim] Pokrandt explained, “With anything involving earth, settlement is expected.”

Unfortunately, as Pokrandt went on to explain, a portion of the dam has settled faster than the dam designers expected.

“The variations are small, but there is an abundance of caution,” he said…

“We are monitoring the conditions at the dam. The dam is not considered unsafe,” said Bill McCormick, chief of the Dam Safety Branch of the Division of Water Resources.

McCormick explained, “approximately four to five years ago there were anomalous instrumentation readings showing the dam had settled unexpectedly in ways that were not predicted in the design.”

“We have not identified a safety concern that has required us to put a restriction on the reservoir,” he pointed out.

According to Pokrandt, construction equipment visible on the dam is part of ongoing work to install measuring devices to gauge both water levels and movements within the dam.

Data collection and analysis regarding settlement of the earth-fill structure has been under way for several years now and the process will continue.

Pokrandt explained that any construction on the dam undertaken by the District, “will be very expensive” and the District wanted more information and data before any decisions were made regarding new construction.

More infrastructure coverage here.

Getting #energy from oil & gas doesn’t require fresh groundwater

Woodland Park stormwater management

From the Colorado Springs Independent (J. Adrian Stanley):

These are the facts accepted by all parties: Last summer and this summer, Green Mountain Falls has seen destructive floods following unusually heavy rains. The town was not affected by the Waldo Canyon Fire. The floods are not the result of runoff from a burn scar. And Woodland Park, located up the pass, has added major developments in recent years, including some alongside Fountain Creek.

Public officials interviewed for this story said they weren’t ready to start playing the blame game. But some people in Green Mountain Falls, especially those who live or own businesses along the creek, are getting edgy. A few have seen bridges washed out multiple times. Mayor Lorrie Worthey says even her home, which is located on a hill, recently had a flooded mudroom.

“There is more water coming down from Woodland; Woodland has grown a lot,” Worthey says carefully. “With that, we are going to get more water.”

Bill Alspach, Woodland Park’s public works director and city engineer, also is cautious when speaking of the Green Mountain Falls flooding. “Woodland Park has strived to be a good steward of the headwaters,” he says.

Woodland Park development affects two watersheds, Fountain Creek and the South Platte. Since the 1990s, the Fountain Creek side has seen the building of Walmart and Safeway stores, each with sprawling parking lots. An apartment complex is also currently under construction.

Alspach says Green Mountain Falls shouldn’t be affected by such development because Woodland Park has had strict stormwater development requirements since 1994. Driving behind the Walmart, he points out two large, grassy retention ponds that slowly release runoff during storms. He’s checked those ponds during downpours, he says, and they’ve been doing their job.

The Safeway doesn’t have such ponds, but Alspach says that’s on purpose, because allowing the water to run off there was found to reduce peak flows in the creek. The apartment complex also has retention ponds, and sits next to a $2.1 million stormwater project that was recently completed by the city and the Federal Emergency Management Agency. Water flows in an underground box culvert, and is slowed by barricades before it hits a large channel.

He also points out private and public retention ponds that dot the town, especially in newer developments.

Woodland Park just forked over $100,000 for stormwater repairs needed after a damaging July storm, and is still paying off bonds from major stream work in 1998 and 1999. Alspach says he’s working his way west-to-east along Fountain Creek, doing upgrades. By the end of next year, he hopes to be close to finishing all the improvements in the city area, and to have a study in hand of what needs to be done on private and Teller County land that stretches between the eastern edge of the city and the Walmart.

All this work has been done, Alspach notes, with money from grants, Woodland Park’s limited general fund budget, a special streets fund and stormwater fees. It’s been done despite the fact that the town is too small to be bound by state permits for water quality.

“We have really endeavored to do the right thing for a long time,” he says.

More stormwater coverage here.