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Fontenelle Dam Releases & Green River Flow Updates

1966 Telephone Island 2-512x219We will post upcoming flow changes as they become available, with the link to Fontenelle Dam daily release information.  Large boulders, rock sills and structures in the river bed pose a constant risk to boaters on this stretch of the Green.  High water has the potential to drastically alter instream characteristics, such as locations of gravel bars, riffles and holes.  Float times during high water can also be expected to decrease.  Low flows will reveal more obstacles for boats and longer float times.  Visitors should be aware of changing flows and the associated risks.  

July 21, 2014

Hello:

Fontenelle Reservoir is currently releasing full powerplant capacity at 1,650 cfs and total release including powerplant and spillway release is approximately 2,200 cfs.  Fontenelle Reservoir inflows continue to migrate to the spillway and spillway releases are currently increasing.  The bypass will not be opened at this time.  

The current spillway use is insufficient to transport the necessary sediment out of the stilling basin.  Therefore, Fontenelle Dam powerplant releases will be decreased to 500 cfs beginning Tuesday, July 22, 2014 at 0900 hours for 24 hours.  Total releases will equal inflow with powerplant capacity at 500 cfs the remainder of releases utilizing the spillway.  

Fontenelle Dam powerplant releases will resume powerplant capacity releases of 1,650 cfs on Wednesday, July 23, 2014 at 0900 hours. Total releases will continue to equal inflow with powerplant capacity at 1,650 cfs and the remainder of releases utilizing the spillway.  

Inflows are decreasing and are anticipated to continuing decreasing to base flows over the next week.  Spillway releases are expected to continue slightly increasing before equalizing tomorrow and then decreasing over the weekend.  

This directive supersedes all previously issued directives and is current until a new directive is issued.   All times identified in this directive are local time (Mountain Daylight Time) and not hour ending.

Your cooperation is greatly appreciated.

Thank you,

​Heather E. Patno

Hydraulic Engineer

Upper Colorado Region

Bureau of Reclamation

 

July 15, 2014 

Fontenelle Reservoir releases are currently 1,750 cfs total release at powerplant capacity.  Fontenelle Reservoir has been filling and the inflows have remained around 4,500 cfs.  Current projections are for Fontenelle Dam to reach spillway elevation of 6,506 ft next week.  Fontenelle Dam releases will spill in order to clear accumulated debris below the spillway.  However, Fontenelle Dam releases will be increased in order to minimize spilled releases.  Therefore, beginning Monday, July 21, 2014, powerplant and bypass releases will be increased to 2,750 cfs, according to the schedule below. 

 

Date               Time    Initial Release              Change            Final Release

 

                     MST    (cfs)                             (cfs)                 (cfs)

07/21/2014      0800    1750                            +250                2000

07/21/2014      1600    2000                            +250                2250

07/22/2014      0800    2250                            +250                2500

07/22/2014      1600    2500                            +250                2750

 

Releases from Fontenelle Dam will equal total release plus reservoir inflow.  It is anticipated that releases will range between 2,750 and 3,250 cfs.  This notification supersedes all previously issued notifications and is current until a new one is issued. 

 

Please note: All times identified in this directive are local time (Mountain Daylight Time) and not hour ending.

 

Thank you,

 

​Heather E. Patno

Hydraulic Engineer

Upper Colorado Region

Bureau of Reclamation

    

Visit the Bureau of Reclamation's website to monitor daily Fontenelle releases at http://www.usbr.gov/uc/water/rsvrs/ops/crsp_40_fn.html  

Last Updated: Jul 22, 2014
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