A Perspective on Today’s Colorado River Issues. Upper Colorado Region River Basins.
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Transcript of A Perspective on Today’s Colorado River Issues. Upper Colorado Region River Basins.
Colorado River Basin Hydrology
• 16.5 million acre-feet (maf) allocated annually
• 13 to 14.5 maf of consumptive use annually
• 60 maf of storage • 15.1 maf average annual “natural”
inflow into Lake Powell over past 100 years
• Inflows are highly variable year-to-year
Colorado River Basin Storage (as of July 20, 2010)
Current Storage Percent Full MAF Elevation
(Feet)
Lake Powell 65% 15.73 3,638
Lake Mead 40% 10.46 1,088
Total System Storage 58% 34.42 NA
State of the System (1999-2010)
WY
Unregulated inflow into Powell
% of Average
Powell and MeadStorage
maf
Powell and Mead
% Capacity
1999 109 47.59 95
2000 62 43.38 86
2001 59 39.01 78
2002 25 31.56 63
2003 52 27.73 55
2004 49 23.11 46
2005 104 27.16 54
2006 71 25.80 51
2007 70 24.43 49
2008 102 26.52 53
2009 88 26.40 53
2010* 66 24.78 49
• Inflow based on latest CBRFC forecast; storage and percent capacity based on April 2010 24-Month Study
3,400
3,450
3,500
3,550
3,600
3,650
3,700
Ele
va
tio
n (
ft)
Jan 1964 - Apr 2010
Lake Powell End of Month Elevation
April 201057% of Capacity
Sep 199995% of Capacity
Prior to 1999, Lake Powell was last at level 3,620.50 feet in April 1993.
1,000
1,025
1,050
1,075
1,100
1,125
1,150
1,175
1,200
1,225
Ele
va
tio
n (
ft)
Jan 1937 - Apr 2010
Lake Mead End of Month Elevation
Spillway Crest 1221 ft
Apr 201044% of Capacity
Sep 199995% of Capacity
Prior to 1999, Lake Mead was at level 1,098.00 feet in May 1965 during the filling of Lake Powell.
Mead reached a low of 1,088.31 feet in March 1965 during the filling of Lake Powell.
Prior to 1960, Lake Mead was at level 1,098.00 feet in May 1957 during the 1950s drought.
Mead hit its lowest level since it first filled of 1,083.49 feet in March 1956.
Shortage Criteria & Coordinated Operating Criteria for L. Powell & L. Mead
ROD signed in Dec. 2007
Multiple entities involved in EIS process
Tremendous assistance from stakeholders
Criteria in place till 2026
Glen Canyon Adaptive Management Program
State-of-the-art process
Diverse stakeholder groups
Independent review panels
Recommendations to the Secretary
Colorado River Basin Salinity Control Program
Salinity damage totals nearly $330 million per year in U.S.
Projects prevent more than 550,000 tons of salt from entering Colorado River each year
Colorado RiverEndangered Fish Species
Bonytail (Gila elegans) Colorado Pikeminnow (Ptycheilus lucius)
Humpback Chub (Gila cypha) Razorback Sucker (Xyrauchen texanus)
Endangered Fish Recovery Programs
Programs in the Upper Colorado River and San Juan River
Enables water development to proceed in compliance with ESA