From email from Reclamation (Dan Crabtree):
For those that work in an office all day and haven’t noticed, it has become quite warm outside. It appears spring has arrived and with that, it is time for the Gunnison Tunnel to start diverting water. The Uncompahgre Valley Water Users Association (UVWUA) plans to start tunnel diversions on Monday, March 19th. Initially diversions will start at 200 cfs. At this same time the UVWUA will need to complete some repair work on the apron of the diversion dam. This will require flows in the Gunnison River be reduced to approximately 400 cfs so that no water is spilling over the diversion dam. Work on the dam apron will be completed by the end of Tuesday, March 20th. At this time, Crystal Dam will increase releases by 100 cfs while the Gunnison Tunnel continues diverting 200 cfs. The resulting flow in the Gunnison River through the Black Canyon will be around 500 cfs.
Gunnison Tunnel diversions may increase later in the week of the 19th and releases at Crystal will be increased accordingly to maintain the 500 cfs flow in the Gunnison River.
Under the current forecast, Reclamation plans to operate the Aspinall Unit to allow the Black Canyon of the Gunnison one day peak flow target of approximately 2,200 cfs to be met; the timing of which is unknown at this time.
As a reminder, the April Aspinall Operations Meeting will be held in Reclamation’s Western Colorado Area Office, Grand Junction location, on April 26th beginning at 1:00 p.m.
Please contact Dan Crabtree or Erik Knight at the Bureau of Reclamation with questions regarding this operation.
More Aspinall Unit coverage here.