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Yellowtail Dam & Bighorn Lake Billings, Montana October 18, 2007 RECLAMATION Managing Water in the West.

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Presentation on theme: "Yellowtail Dam & Bighorn Lake Billings, Montana October 18, 2007 RECLAMATION Managing Water in the West."— Presentation transcript:

1 Yellowtail Dam & Bighorn Lake Billings, Montana October 18, 2007 RECLAMATION Managing Water in the West

2 Bighorn Lake and River Basin Investigations Possible Flood Storage Reallocation Bighorn River Basin Changes (Depletion Study)

3 Flood Control Storage Reallocation

4 BIGHORN LAKE STORAGE ALLOCATIONS Dam Crest Elev Top of Conservation Elev (493,584 Acre - Feet) Surcharge (52,829 af) 3657 (1,328,360 AF) Exclusive Flood Control - 258,331 Acre - Feet 3640 (1,070,029 Acre - Feet) Joint Use - 240,342 Acre - Feet 3614 (829,687 Acre - Feet) Top of Dead Elev (16,008 Acre - Feet) Active Conservation - 336,103 Acre - Feet Inactive Conservation - 477,576 Acre - Feet Dead - 16,008 Acre - Feet

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7 Scenarios Modeled & Reviewed Normal Full Pool Elev. 3640, Current Flood Control Storage Allocation Normal Full Pool Elev 3645, Modified Flood Control Storage Allocation with top of Joint Use raised 5 ft

8 BIGHORN LAKE STORAGE ALLOCATION Dam Crest Elev Top of Conservation Elev (493,584 Acre - Feet) Surcharge (52,829 af) 3657 (1,328,360 AF) Exclusive Flood Control - 258,331 Acre - Feet 3640 (1,070,029 Acre - Feet) Joint Use - 240,342 Acre - Feet 3614 (829,687 Acre - Feet) Top of Dead Elev (16,008 Acre - Feet) Active Conservation - 336,103 Acre - Feet Inactive Conservation - 477,576 Acre - Feet Dead - 16,008 Acre - Feet

9 PROPOSED STORAGE REALLOCATION Dam Crest Elev Top of Inactive Conservation Elev (493,584 Acre - Feet) Surcharge 3657 (1,328,360 AF Exclusive Flood Control - 190,846 Acre - Feet 3645 (1,1370,514 Acre - Feet) Joint Use - 307,827 Acre - Feet 3614 (829,687 Acre - Feet) Top of Dead Elev (16,008 Acre - Feet) Active Conservation - 336,103 Acre - Feet Inactive Conservation - 477,576 Acre - Feet Dead - 16,008 Acre - Feet

10 Possible Flood Storage Reallocation Current Joint Use Pool –240,342 –Elevation Exclusive Flood Pool –258,331 acre-feet –Elevation Conservation Pool –567,445 acre-feet –Elevation Reallocation Joint Use Pool –307,827 acre-feet –Elevation Exclusive Flood Pool –190,846 acre-feet –Elevation Conservation Pool –643,930 acre-feet –Elevation Total Flood Control Storage Space 498,673 acre-feet Elev

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14 Flood Control Impacts Not Addressed To Be Determined by Corps of Engineers

15 BIGHORN RIVER BASIN CHANGES

16 Bighorn Lake Average Inflow Pre-Drought Flows vs. Drought Flows

17 8 Year Average Drought Inflow 53% OF Period

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24 Bighorn River Investigations Bighorn Lake Flood Pool Reallocation –Raise Joint Use Pool 5 feet Bighorn River Basin Depletion Study –New Irrigation or other Development –New Reservoir Storage –New well Development –Changes in Land Management Practices –Changes in Forest Management

25 QUESTIONS & COMMENTS


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