@ColoradoWater “State of the River” meetings #ColoradoRiver #COriver

Yampa/White/Green/North Platte river basins via the Colorado Geological Survey
Gunnison River Basin via the Colorado Geological Survey
Colorado River Basin in Colorado via the Colorado Geological Survey

Aspinall Unit operations update

Aspinall Unit dams

From email from Reclamation (Erik Knight):

The May 15th forecast for the April – July unregulated inflow volume to Blue Mesa Reservoir is 825,000 acre-feet. This is 122% of the 30 year average. Blue Mesa Reservoir current content is 681,000 acre-feet which is 82% of full. Current elevation is 7502.4 ft. Maximum content at Blue Mesa Reservoir is 829,500 acre-feet at an elevation of 7519.4 ft.

Based on the May 1st forecast, the Black Canyon Water Right peak flow target is listed below:

Black Canyon Water Right

The peak flow target is equal to 6,427 cfs for a duration of 24 hours.

The shoulder flow target is 831 cfs, for the period between May 1 and July 25.

The May 15th forecast of 825,000 af is now in the Average Wet category and the Aspinall Unit ROD flow targets have changed. Based on the May 15th forecast, the flow targets are listed below:

Aspinall Unit Operations ROD

The year type is currently classified as Average Wet.

The peak flow target is 14,040 cfs and the duration target at this flow is 2 days.

The half bank-full target is 8,070 cfs and the duration target at this flow is 20 days.

The spring peak operation has reached peak release level. The release increase made this morning, May 24th, should result in the first day of flows > 14,000 cfs at the Whitewater gage, arriving by the afternoon of May 25th. Today, flows in the Gunnison River through the Black Canyon have reached 11,500 cfs. The current rate of release is planned to continue through Sunday, May 28th. At this time it is projected that there is additional water that needs to be released from the Aspinall Unit to prevent overfilling at Blue Mesa Reservoir, therefore the peak release is continuing to meet more than the 2 day duration target.

@ColoradoRiver: Expanded funding available for agricultural producers to implement irrigation efficiency projects in the Lower Gunnison Basin

Sweet corn near Olathe, CO. Photo credit Mark Skalny, The Nature Conservancy.

The Colorado River District has announced an additional funding opportunity (up to a total of $1.8 million) to support qualifying applicants for planning and implementation of irrigation efficiency improvement projects in the Lower Gunnison Project area. Applications from landowners that address identified resource concerns within the Bostwick Park, Paonia, Smith Fork, and Uncompahgre project areas will be accepted through July 21, 2017, for funding consideration.

This announcement of funding opportunity is an expansion of on-going, cooperatively-managed activities made possible by the Regional Conservation Partnership Program (RCPP) Environmental Quality Incentives Program (EQIP) for on-farm improvements, like conversion to pressure-piped sprinklers.

“We are excited to be able to continue to provide this funding that can be used to make our agricultural partners more productive and competitive while helping to meet important water resource management objectives,” explained Dave Kanzer, Project Manager and Deputy Chief Engineer of the River District.

Successful producer-applicants will receive financial assistance to plan, design and install advanced irrigation systems that address identified natural resource concerns. For example, these include projects that improve: 1) water availability (i.e., water use efficiency), 2) water quality (e.g. salinity and selenium loading), 3) soil health (e.g., cover cropping), and 4) fish and wildlife habitat (i.e., projects that benefit water quantity / quality). The Lower Gunnison Project uses an integrated application, contract process and a favorable cost-share ratio.

Interested applicants, landowners, and/or producers are encouraged to attend a Lower Gunnison Project Funding Interest Meeting in their area:

  • Hotchkiss: June 29 (6-6:15 pm light food/refreshments; Main program starts at 6:15 pm). Hotchkiss Memorial Hall, 276 W Main Street, Hotchkiss, CO 81419
  • Montrose: June 28 (6-6:15 pm light food/refreshments; Main program starts at 6:15 pm). Delta Montrose Electric Association (DMEA), 11925 6300 Rd, Montrose, CO 81402

An application and more information can be obtained by visiting the Shavano Conservation District (102 Par Place, Suite #4, Montrose, CO 81401 / Phone (970) 249-8407 Ext. 115) or Delta Conservation District (690 Industrial Blvd, Delta, CO 81416 / Phone (970) 399- 8194). Interested individuals can also contact the Colorado River District at (970) 945-8522 or go to the following website: http://gunnisonriverbasin.org/projects/lower-gunnison-project/

This funding opportunity complies with the rules and regulations of the Natural Resources Conservation Service Environmental Quality Incentive Program and is open to all eligible agricultural producers without discrimination or bias.

@USBR Increases Releases from the Aspinall Unit to Meet Flow Targets on the Gunnison River

Black Canyon of the Gunnison

Here’s the release from the US Bureau of Reclamation (Justyn Liff/Erik Knight):

The Bureau of Reclamation began increasing releases from the Aspinall Unit, consisting of Blue Mesa, Morrow Point, and Crystal reservoirs on the Gunnison River, on May 14, 2017. The increased release will attempt to meet flow targets on the Gunnison River, designed to benefit endangered fish species downstream while continuing to meet the congressionally authorized purposes of the Aspinall Unit.

Flows in the Gunnison River through the Black Canyon will increase at a minimum of 500 cubic-feet-per-second a day resulting in flows through the canyon that may reach 12,000 cfs by approximately May 23. Flows will remain around 11,500 cfs to 12,000 cfs for 3-5 days before incrementally decreasing toward a range of 5,000 cfs to 5,500 cfs around May 29.

The first “Gunnison Basin News” is hot off the presses

Gunnison River Basin High/Low graph May 2, 2017 via the NRCS.

Click here to read the newsletter from the Gunnison Basin Roundtable. Here’s an excerpt:

Introduction

This newsletter is a project of the Gunnison Basin Roundtable to serve all water stakeholders in the basin. Since we all depend on water, that means everyone! The newsletter operates in conjunction with the http://GunnisonRiverBasin.Org website, which is still under construction but already has some good information. Please send your feedback on the newsletter and the website, as well as announcements of events you would like to have featured in future newsletters, to info@gunnisonriverbasin.com.

News

COLORADO REACHES A SECOND PEAK AFTER A WARM SPELL

After a very dry start to the winter, the snowpack in the mountains of the Gunnison Basin started piling up in December and hit a first peak in early March, about a month earlier than average. Unseasonably warm temperatures brought significant melting, but storms at the end of March increased accumulations again, at least at higher elevations.

You can see how the season has progressed on this graph from the Natural Resources Conservation Service: https://www.wcc.nrcs.usda.gov/ftpref/data/water/wcs/basinsweplots/co/basinplotgun17.gif? .

The Upper Colorado Basin snowpack, ultimately destined to flow towards Lake Powell, has followed a similar path, as this graph shows:

https://www.usbr.gov/uc/water/notice/Graphs/Upper_Colorado.png​.

Aspinall unit operations update

Aspinall Unit

From email from Reclamation (Erik Knight):

The April 15th forecast for the April – July unregulated inflow volume to Blue Mesa Reservoir is 850,000 acre-feet. This is 126% of the 30 year average. Snowpack in the Upper Gunnison Basin is currently 124% of average. Blue Mesa Reservoir current content is 623,000 acre-feet which is 75% of full. Current elevation is 7495.3 ft. Maximum content at Blue Mesa Reservoir is 829,500 acre-feet at an elevation of 7519.4 ft.

Black Canyon Water Right

The peak flow and shoulder flow components of the Black Canyon Water Right will be determined by the May 1 forecast of the April – July unregulated inflow volume to Blue Mesa Reservoir. If the May 1 forecast is equal to the current forecast of 850,000 acre-feet of runoff volume, the peak flow target will be equal to 6,427 cfs for a duration of 24 hours. The shoulder flow target will be 831 cfs, for the period between May 1 and July 25. The point of measurement of flows to satisfy the Black Canyon Water Right is the Gunnison River below Gunnison Tunnel streamgage at the upstream boundary of Black Canyon of the Gunnison National Park.

Aspinall Unit Operations ROD

Pursuant to the Aspinall Unit Operations Record of Decision (ROD), the peak flow and duration flow targets in the lower Gunnison River, as measured at the Whitewater gage, will be determined by the forecast of the April – July unregulated inflow volume to Blue Mesa Reservoir and the hydrologic year type. At the time of the spring operation, if the forecast is equal to the current forecast of 850,000 acre-feet of runoff volume, the hydrologic year type will be set as Moderately Wet. Under a Moderately Wet year the peak flow target will be 14,350 cfs and the duration target at this flow will be 10 days. The duration target for the half bankfull flow of 8,070 cfs will be 40 days.

Projected Spring Operations

During spring operations, releases from the Aspinall Unit will be made in an attempt to match the peak flow of the North Fork of the Gunnison River to maximize the potential of meeting the desired peak at the Whitewater gage, while simultaneously meeting the Black Canyon Water Right peak flow amount. The magnitude of release necessary to meet the desired peak at the Whitewater gage will be dependent on the flow contribution from the North Fork of the Gunnison River and other tributaries downstream from the Aspinall Unit. Current projections for spring peak operations show that flows in the Gunnison River through the Black Canyon could be over 9,000 cfs for 10 days in order to achieve the desired peak flow and duration at Whitewater. If actual flows on the North Fork of the Gunnison River are less than currently projected, flows through the Black Canyon could be even higher. With this runoff forecast and corresponding downstream targets, Blue Mesa Reservoir is currently projected to fill to an elevation of around 7507 feet with an approximate peak content of 719,000 acre-feet.

Aspinall Unit operations update

Morrow Point Dam spilling June 2014 via USBR

From email from Reclamation (Erik Knight):

The April 1st forecast for the April – July unregulated inflow volume to Blue Mesa Reservoir is 930,000 acre-feet. This is 138% of the 30 year average. Snowpack in the Upper Gunnison Basin is currently 147% of average. Blue Mesa Reservoir current content is 582,000 acre-feet which is 70% of full. Current elevation is 7490.1 ft. Maximum content at Blue Mesa Reservoir is 829,500 acre-feet at an elevation of 7519.4 ft.

Black Canyon Water Right

The peak flow and shoulder flow components of the Black Canyon Water Right will be determined by the May 1 forecast of the April – July unregulated inflow volume to Blue Mesa Reservoir. If the May 1 forecast is equal to the current forecast of 930,000 acre-feet of runoff volume, the peak flow target will be equal to 6,575 cfs for a duration of 24 hours. The shoulder flow target will be 921 cfs, for the period between May 1 and July 25. The point of measurement of flows to satisfy the Black Canyon Water Right is the Gunnison River below Gunnison Tunnel streamgage at the upstream boundary of Black Canyon of the Gunnison National Park.

Aspinall Unit Operations ROD

Pursuant to the Aspinall Unit Operations Record of Decision (ROD), the peak flow and duration flow targets in the lower Gunnison River, as measured at the Whitewater gage, will be determined by the forecast of the April – July unregulated inflow volume to Blue Mesa Reservoir and the hydrologic year type. At the time of the spring operation, if the forecast is equal to the current forecast of 930,000 acre-feet of runoff volume, the hydrologic year type will be set as Moderately Wet. Under a Moderately Wet year the peak flow target will be 14,350 cfs and the duration target at this flow will be 10 days. The duration target for the half bankfull flow of 8,070 cfs will be 40 days.

Projected Spring Operations

During spring operations, releases from the Aspinall Unit will be made in an attempt to match the peak flow of the North Fork of the Gunnison River to maximize the potential of meeting the desired peak at the Whitewater gage, while simultaneously meeting the Black Canyon Water Right peak flow amount. The magnitude of release necessary to meet the desired peak at the Whitewater gage will be dependent on the flow contribution from the North Fork of the Gunnison River and other tributaries downstream from the Aspinall Unit. Current projections for spring peak operations show that flows in the Gunnison River through the Black Canyon could be over 8,500 cfs for 10 days in order to achieve the desired peak flow and duration at Whitewater. If actual flows on the North Fork of the Gunnison River are less than currently projected, flows through the Black Canyon could be even higher. With this runoff forecast and corresponding downstream targets, Blue Mesa Reservoir is currently projected to fill to an elevation of around 7518 feet with an approximate peak content of 816,000 acre-feet.