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Yellowtail Dam & Bighorn Lake Water Supply & Operations Meeting Billings, Montana October 8, 2009

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RECLAMATION. Managing Water in the West. Yellowtail Dam & Bighorn Lake Water Supply & Operations Meeting Billings, Montana October 8, 2009. Welcome & Introductions. Purpose of Meeting. Public outreach / education regarding Yellowtail Dam & Bighorn Lake

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Presentation Transcript
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RECLAMATION

Managing Water in the West

Yellowtail Dam & Bighorn Lake

Water Supply & Operations Meeting

Billings, Montana

October 8, 2009

purpose of meeting
Purpose of Meeting
  • Public outreach / education regarding Yellowtail Dam & Bighorn Lake
  • Recap operations during water year 2009
  • Present operation scenarios for fall / winter 2009-2010
  • Obtain feedback / comment from public & interested parties
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Montana Area Office is responsible for managing the water supplies and administering Reclamation programs for Reclamation projects located in Montana east of the continental divide.
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The Montana Area Office monitors hydrologic and climatic conditions, prepares inflow projections and operation plans, and directs water releases from Yellowtail Dam.
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YELLOWTAIL DAM and BIGHORN LAKE

Spillway Inlet

Bighorn Lake

Visitor Center

Powerplant

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YELLOWTAIL DAM, BIGHORN LAKE and AFTERBAY

Yellowtail Afterbay Dam

Substation

Visitor Center

Yellowtail Dam

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YELLOWTAIL AFTERBAY DAM and AFTERBAY

Sewage Lagoons

Afterbay

Sluice Gates

Afterbay Dam

Bighorn Canal

Radial Gates

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BIGHORN LAKE STORAGE ALLOCATIONS

Dam Crest

Maximum Water Surface or Top of Surcharge Elev. 3660.00 (1,381,189 Acre-Feet)

Elev. 3660.0

SURCHARGE - 52,829 Acre-Feet

Top of Exclusive Flood Elev. 3657.00 (1,328,360 AF)

EXCLUSIVE FLOOD CONTROL - 258,331 Acre-Feet

Top of Joint Use Elev. 3640.00 (1,070,029 Acre-Feet)

JOINT USE - 240,342 Acre-Feet

Top of Active Conservation Elev. 3614.00 (829,687 Acre-Feet)

Spillway crest Elev. 3593.00

ACTIVE CONSERVATION - 336,103 Acre-Feet

FISH

WILDLIFE

RECREATION

AGRICULTURE

POWER

MUNICIPAL

INDUSTRIAL

Top of Inactive Elev. 3547.00 (493,584 Acre-Feet)

Powerplant Penstock Elev. 3450.00

INACTIVE CONSERVATION - 477,576 Acre-Feet

Irrigation Outlet Elev. 3400.00

River Outlet Elev. 3300.0

Top of Dead Elev. 3296.50 (16,008 Acre-Feet)

DEAD - 16,008 Acre-Feet

Streambed Elev. 3166.0

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Recap of Water Year 2009
  • Mountain Snowpack
  • Precipitation
  • Inflow to Bighorn Lake
  • Bighorn River Releases
  • Bighorn Lake Storage Conditions
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Peaked on 4/16 @ 106% of average

Recap of Water Year 2009

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Recap of Water Year 2009

2009 – 2,730 kaf

Ave. – 2,357 kaf

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Recap of Water Year 2009

2009 – 1,657 kaf

Ave. – 1,113 kaf

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Recap of Water Year 2009

WY-2009 April-July Inflow – 1,657 kaf (149% of average)

WY-2009 Annual Inflow – 2,730 kaf (116% of average)

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Recap of Water Year 2009

Peaked on 7/06 at 3647.92 feet

7.92 feet above full pool

5.42 feet higher than in 2008

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Summary Recapping Water Year 2009
  • Water year started out with good precipitation – Oct. above average but dropped to below average during Nov.
  • Precipitation returned to above average during Dec. & Jan. Precipitation dropped to well below average in Feb. returned to well above average during March & April. Unlike last year, precipitation was well below average in May but returned to well above average in June through Aug. with Sept. dropping well below normal.
  • October-March inflows were 80% of average totaling 732 kaf. April-July inflows were 149% of average totaling 1,657 kaf.
  • Annual inflows were 116% of average totaling 2,730 kaf.
  • Bighorn Lake reached a low level at elevation 3619.50 on May 20.
  • Bighorn Lake reached a peak level at elevation 3647.92 on July 6.
  • Bighorn Lake rose 28.4 feet from May 20 to July 6.
  • Fall & winter releases were maintained at 2,450 cfs.
  • Beginning in early April, releases were gradually increased from 2,450 cfs to nearly 4,440 cfs by late May.
  • Beginning in late June & into early July, releases were gradually increased to a peak of 12,500 cfs to control the spring runoff and rate of fill.
  • Rains in June accompanied by unusually large releases out of Buffalo Bill & Boysen, caused inflows to reach a peak of 16,760 cfs on June 22.
  • Since July 6, storage has slowly declined to elevation 3640 by September 22 and has essentially remained near full.
  • Current lake level is only about 0.5 foot below full, 2nd highest of record and releases are currently being maintained at 2,800 cfs.
bighorn lake current conditions
BIGHORN LAKE CURRENT CONDITIONS

October 7, 2009

Elevation

3639.48 ft – 0.52 feet below full pool

0.13 feet lower than last year

Storage

1,063,500 af – 99% full

Inflows = 3,450 cfs

Total Outflow = 2,800 cfs

River = 2,800 cfs

BIA Canal = 0 cfs

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Inflow Forecast to Bighorn Lake – WY-2010

WY-2009 Oct-Mar Actual Inflow – 732 kaf

WY-2010 Oct-Mar Inflow Forecast – 778 kaf

bighorn lake operation scenarios
Bighorn Lake Operation Scenarios

Most Probable Inflow Scenario:

  • October – March Inflow forecast at 778 kaf
  • Maintain fall and winter release at 2,720 cfs through March
  • Reservoir level expected to reach elevation 3620.6 by the end of March.
  • Generation during October – March would total 382.6 GWHrs.
bighorn lake operation scenarios31
Bighorn Lake Operation Scenarios

Minimum Probable Inflow Scenario:

  • October – March Inflow forecast at 685 kaf
  • Maintain fall and winter release at 2,700 cfs through January and gradually reduce to 2,300 cfs in February and to 2,000 cfs in March
  • Reservoir level expected to reach elevation 3618.4 by the end of March.
  • Generation during October – March would total 349.9 GWHrs.
bighorn lake operation scenarios34
Bighorn Lake Operation Scenarios

Maximum Probable Inflow Scenario:

  • October – March Inflow forecast at 843 kaf
  • Maintain fall and winter release at 2,770 cfs through February and increase release to 3,535 cfs during March
  • Reservoir level expected to reach elevation 3620.8 by the end of March
  • Generation during October – March would total 408.9 GWHrs.
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Comments ?

The information presented at this meeting can be found on the Montana Area Office website at:www.usbr.gov/gp/mtao/yellowtail/index.cfm.

Please mail comments to:

Ms. Paula A. Holwegner

Bureau of Reclamation

2900 4th Avenue North, Suite 501

Billings, MT 59107

fax your comments to: 406-247-7338

or email your comments to: pholwegner@gp.usbr.gov

by October 13, 2009

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Reclamation’s Internet Website

http://www.usbr.gov/gp/water/

  • near real-time data available through the HYDROMET data system
  • summaries and plots of historical data
  • annual reservoir operating plan publication
  • monthly water supply reports
  • project data
  • snow plots
  • links to related internet sites
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