Aspinall Unit Operations Update

Aspinall Unit April – July, 2020 Forecasted Inflow

From email from Reclamation (Erik Knight):

April – July unregulated inflow volume to Blue Mesa Reservoir
Current Forecast (June 1) = 395,000 AF (59% of average)

Blue Mesa Reservoir current conditions
Content = 595,000 AF (72% full)
Elevation = 7491.7 ft
Inflow = 2200 cfs

Crystal Release = 1450 cfs
Gunnison Tunnel diversion = 1050 cfs
Gunnison River flow = 430 cfs

Spring Operations Summary

Aspinall Unit Operations ROD

Hydrologic Category = Moderately Dry
Peak Flow = 4510 cfs
Duration at Peak Flow = 1 day

Baseflow Target: June/July/Aug = 1050 cfs

(Point of measurement is the Gunnison River near Grand Junction streamgage, commonly called the Gunnison River at Whitewater)

Black Canyon Water Right

Peak Flow = 2840 cfs (24 hour duration)
Shoulder Flow Target = 300 cfs (May 1 – July 25)

(Point of measurement is the Gunnison River below Gunnison Tunnel streamgage at the upstream boundary of Black Canyon of the Gunnison National Park)

Projected Operations

Gunnison River flows (Black Canyon/Gunnison Gorge)
Currently around 400 cfs, possibly increasing to 600-700 cfs during July-August
Projected Blue Mesa Reservoir maximum fill = 620,000 AF at 7495 ft elevation
Projected Blue Mesa Reservoir conditions on Dec 31 = 473,000 AF at 7475 ft elevation

Click here to read the current Aspinall Unit Forecast.

Aspinall Unit dams

Leave a Reply