1. Boysen/Buffalo Bill Reservoir Operations John H. Lawson Area Manager Wyoming Area Office April 24, 2007

2. Wyoming Area

4. SNOW WATER EQUIVALENT AS PERCENT OF AVERAGE Natural Resources Conservation Service - Monday MORNING SNOW REPORT (No. 22) April 23, 2007

5. + Change from 4/23/07 +3 +2

6. Bull Lake Dam & Reservoir

7. Water Year April-July Inflow (acre-feet) 2003110,200 2004117,300 2005154,700 2006120,800 2007 Forecast 110,000 Avg 138,800 79% of Avg Basin above Bull Lake Snow Water Equivalent Forecasted Min 85,000 61% of Avg

8. Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow 2000100,000115,000125,000120,000100,000 115,200 2001115,000100,000 90,000 85,800 2002110,000100,000 90,00098,600 2003100,000 110,000130,000110,000 110,200 2004120,000110,000 100,000110,000100,000117,300 2005150,000 135,000 140,000160,000154,700 2006115,000130,000 110,000 90,000120,500 2007115,000 110,000????? Bull Lake Forecasted April-July Inflow (acre-feet)

9. Boysen Dam, Reservoir, & Powerplant

10. Water Year April-July Inflow (acre-feet) 2003262,300 2004320,700 2005589,300 2006200,500 2007 Forecast 300,000 Avg 551,300 54% of Avg Basin above Boysen Reservoir Snow Water Equivalent Forecasted Min 200,000 36% of Avg

11. Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow 2000460,000490,000500,000450,000300,000 278,400 2001420,000330,000 200,000 170,000118,000 2002375,000 325,000 300,000210,00159,200 2003250,000 340,000450,000250,000240,000262,300 2004440,000350,000400,000200,000250,000 320,700 2005525,000510,000400,000 420,000575,000589,300 2006400,000500,000 450,000350,000300,000200,500 2007350,000 300,000??? Boysen Reservoir Forecasted April-July Inflow (acre-feet)

12. Water Year Apr-Jul Inflow (acre-feet) Avg Apr-Jul Inflow (acre-feet) Annual Inflow (acre-feet) 30-yr Average Annual Inflow (acre-feet) 2000278,400 551,300 (1977-2006 avg.) 667,500 (1970-1999 avg.) 626,000 940,900 (1977-2006 avg.) 1,094,100 (1970-1999 avg.) 2001118,000361,700 2002159,200383,800 2003262,300548,200 2004320,700627,800 2005589,300945,300 2006200,500500,700 2007 Exp. 300,000 Min. 200,000 Exp. 555,000 Min. 455,000 Boysen Reservoir Inflow

13. Boysen Reservoir Outflow Water Year Outflow (acre-feet) 30 Year Average Outflow (acre-feet) Oct-MarApr-SepTotalOct-MarApr-SepAnnual 2000338,200380,200718,400 2001247,800352,100599,900 2002142,900306,000448,900 2003109,200326,000435,200 2004130,300338,700469,000346,000602,900948,900 2005145,500682,800828,300 2006315,500369,300684,800 2007181,600 Exp. 365,000 Min. 365,000 ???

15. Buffalo Bill Dam, Visitor Center, & Shoshone Powerplant

16. Water Year April-July Inflow (acre-feet) 2003657,900 2004387,000 2005513,400 2006545,900 2007 Forecasted 425,000 Avg 640,100 66% of Avg Basin above Buffalo Bill Reservoir Snow Water Equivalent Forecasted Min 350,000 55% of Avg

17. Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow 2000500,000540,000550,000 500,000 536,200 2001500,000430,000400,000375,000400,000360,000374,800 2002550,000 490,000500,000550,000530,000552,500 2003500,000550,000 650,000560,000540,000667,900 2004630,000530,000 400,000350,000400,000387,000 2005500,000450,000425,000400,000 485,000513,400 2006600,000650,000 600,000500,000470,000545,900 2007500,000 525,000425,000??? Buffalo Bill Reservoir Forecasted April-July Inflow (acre-feet)

18. Water Year April-July Inflow (acre-feet) 1987447,000 1988394,000 1994413,000 2002375,000 2007 Forecast 425,000 Avg 640,100 Basin above Buffalo Bill Reservoir SWE Comparison to Past Years

19. Water Year Apr-Jul Inflow (acre-feet) Avg 1 Apr-Jul Inflow (acre-feet) Annual Inflow (acre-feet) Average 1 Annual Inflow (acre-feet) 2000536,200 640,100 (1977-2006 avg.) 716,600 (1970-1999 avg.) 664,000 819,100 (1977-2006 avg.) 914,000 (1970-1999 avg.) 2001374,800507,100 2002552,500665,700 2003667,900782,700 2004387,000561,400 2005513,400680,000 2006545,900701,600 2007 Expected 425,000 Min 350,000 Expected 579,000 Min 504,000 Buffalo Bill Reservoir Inflow 1 30-year average 1977-2006

20. Water Year Outflow (acre-feet) Average 1 Outflow (acre-feet) 2000 774,500 (wr 350 cfs) 814,600 2001 638,100 (wr 350 cfs) 2002 573,600 (wr 100 cfs) 2003 675,400 (wr 100 cfs) 2004 587,800 (wr 100 cfs) 2005 668,300 (wr 150 cfs) 2006 710,200 (wr 200 cfs) 2007 Expected 630,000 Min 630,000 (wr 150 cfs) Buffalo Bill Reservoir Outflow 1 30-year average 1977-2006 wr = winter release

22. Projected for 2007 2007 Annual Inflow 579,000 AF Sept. 30, 2007 Res Content 387,000 AF Sept. 30, 2007 State Account 179,000 AF

24. Note: Symbols represent typical reservoir uses. Boysen Reservoir Allocations

25. Note: Symbols represent typical reservoir uses. Buffalo Bill Reservoir Storage Accounts

26. Note: Symbols represent typical reservoir uses. Buffalo Bill Reservoir Allocations