Aspinall Unit operations update: Releases from Crystal to be lowered to 2000 cfs #ColoradoRiver

July 2, 2015
Aspinall Unit

Aspinall Unit

From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be decreased from 3700 cfs to 2000 cfs between July 2nd and July 6th. Releases will be decreased by 200 cfs today, and then by 400 cfs each day over the next 3 days, with a final decrease of 300 cfs on the morning of July 6th. This reduction is in response to the continuing decline in runoff to the Aspinall Unit reservoirs. The current forecast for April-July unregulated inflow to Blue Mesa Reservoir is now 700,000 acre-feet which is 104% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 1500 cfs. River flows are expected to stay above the baseflow target for the foreseeable future.

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 July.

Currently, diversions into the Gunnison Tunnel are around 1000 cfs and flows in the Gunnison River through the Black Canyon are 2800 cfs. After this release change Gunnison Tunnel diversions will be around 1000 cfs and flows in the Gunnison River through the Black Canyon should be around 1100 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

More Aspinall Unit coverage here.


UGRWCD: Morrow Dam spilling — beautiful

June 25, 2015

(If the Tweet above does not display correctly use your browser refresh button. There are timing problems with content between WordPress and Twitter at times.)


Aspinall Unit operations update: Releases increasing to meet Black Canyon Water Right peak flow target of 2,054 cfs

May 8, 2015
Aspinall Unit

Aspinall Unit

From email from Reclamation (Erik Knight):

Significant rainfall in the North Fork of the Gunnison basin has changed things considerably over the last 24 hours. What was predicted to be a 1,500 cfs peak at the Somerset gage turned into a 2,600 cfs peak last night, with over 4,000 cfs in the North Fork at the confluence gage. This resulted in flows reaching 5,800 cfs on the Gunnison River at the Whitewater gage, above the peak flow target of 4,991 cfs.

Currently flows in the Gunnison River through the Black Canyon are 1,050 cfs so release at Crystal Dam will continue to be increased in order to reach the Black Canyon Water Right peak flow target of 2,054 cfs. The peak release for the Black Canyon Water Right will be maintained for 24 hours before releases are ramped down, starting late Saturday night, May 9th. The updated release schedule is shown below:

aspinallunitreleaseschedule0507thru05132015


Aspinall Unit operations update

April 29, 2015
Gunnison Tunnel via the National Park Service

Gunnison Tunnel via the National Park Service

From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be increased from 1150 cfs to 1250 cfs on Wednesday, April 29th at 9:00 AM. This release increase is in response to an increase in diversion to the Gunnison Tunnel. The current forecast for April-July unregulated inflow to Blue Mesa Reservoir is 450,000 acre-feet which is 67% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 890 cfs. River flows are expected to stay above the baseflow target for the foreseeable future.

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 890 cfs for April and May.

Currently, diversions into the Gunnison Tunnel are 800 cfs and flows in the Gunnison River through the Black Canyon are around 350 cfs. After this release change Gunnison Tunnel diversions will be around 900 cfs and flows in the Gunnison River through the Black Canyon should be around 350 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

More Aspinall Unit coverage here.


Aspinall Unit operations meeting Thursday #ColoradoRiver

April 21, 2015
Aspinall Unit dams

Aspinall Unit dams

From email from Reclamation (Erik Knight):

The next Aspinall Unit Operations meeting will be held this Thursday, April 23rd, at the Western Colorado Area Office in Grand Junction, starting at 1 PM.

The address of the WCAO is 445 West Gunnison Ave, Suite #221

More Aspinall Unit coverage here.


Aspinall Unit operations update: Current forecast for inflow into Blue Mesa = 71% of avg

April 15, 2015

Blue Mesa Reservoir

Blue Mesa Reservoir


From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be increased from 1050 cfs to 1150 cfs on Wednesday, April 15th at 9:00 AM. This release increase is in response to an increase in diversion to the Gunnison Tunnel. The current forecast for April-July unregulated inflow to Blue Mesa Reservoir is 480,000 acre-feet which is 71% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 1050 cfs. River flows are expected to stay above the baseflow target for the foreseeable future.

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 1050 cfs for April.

Currently, diversions into the Gunnison Tunnel are 700 cfs and flows in the Gunnison River through the Black Canyon are around 350 cfs. After this release change Gunnison Tunnel diversions will be around 800 cfs and flows in the Gunnison River through the Black Canyon should be around 350 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.


Aspinall Unit operations update

April 8, 2015

Crystal dam spilling May 2009

Crystal dam spilling May 2009


From email from Reclamation (Erik Knight):

Releases from Crystal Dam will be increased from 600 cfs to 750 cfs on Wednesday, April 8th at 8:00 AM. This release increase is in response to an increase in diversion to the Gunnison Tunnel. The current forecast for April-July unregulated inflow to Blue Mesa Reservoir is 480,000 acre-feet which is 71% of average.

Flows in the lower Gunnison River are currently above the baseflow target of 1050 cfs. River flows are expected to stay above the baseflow target for the foreseeable future.

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 1050 cfs for April.

Currently, diversions into the Gunnison Tunnel are 300 cfs and flows in the Gunnison River through the Black Canyon are around 300 cfs. After this release change Gunnison Tunnel diversions will be around 400 cfs and flows in the Gunnison River through the Black Canyon should be around 350 cfs. Current flow information is obtained from provisional data that may undergo revision subsequent to review.

More Aspinall Unit coverage here.


Follow

Get every new post delivered to your Inbox.

Join 1,243 other followers

%d bloggers like this: