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

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Presentation transcript:

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

Wyoming Area

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

+ Change from 4/23/

Bull Lake Dam & Reservoir

Water Year April-July Inflow (acre-feet) , , , , Forecast 110,000 Avg 138,800 79% of Avg Basin above Bull Lake Snow Water Equivalent Forecasted Min 85,000 61% of Avg

Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow ,000115,000125,000120,000100, , ,000100,000 90,000 85, ,000100,000 90,00098, , ,000130,000110, , ,000110, ,000110,000100,000117, , , ,000160,000154, ,000130, ,000 90,000120, , ,000????? Bull Lake Forecasted April-July Inflow (acre-feet)

Boysen Dam, Reservoir, & Powerplant

Water Year April-July Inflow (acre-feet) , , , , Forecast 300,000 Avg 551,300 54% of Avg Basin above Boysen Reservoir Snow Water Equivalent Forecasted Min 200,000 36% of Avg

Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow ,000490,000500,000450,000300, , ,000330, , ,000118, , , ,000210,00159, , ,000450,000250,000240,000262, ,000350,000400,000200,000250, , ,000510,000400, ,000575,000589, ,000500, ,000350,000300,000200, , ,000??? Boysen Reservoir Forecasted April-July Inflow (acre-feet)

Water Year Apr-Jul Inflow (acre-feet) Avg Apr-Jul Inflow (acre-feet) Annual Inflow (acre-feet) 30-yr Average Annual Inflow (acre-feet) , ,300 ( avg.) 667,500 ( avg.) 626, ,900 ( avg.) 1,094,100 ( avg.) ,000361, ,200383, ,300548, ,700627, ,300945, ,500500, Exp. 300,000 Min. 200,000 Exp. 555,000 Min. 455,000 Boysen Reservoir Inflow

Boysen Reservoir Outflow Water Year Outflow (acre-feet) 30 Year Average Outflow (acre-feet) Oct-MarApr-SepTotalOct-MarApr-SepAnnual ,200380,200718, ,800352,100599, ,900306,000448, ,200326,000435, ,300338,700469,000346,000602,900948, ,500682,800828, ,500369,300684, ,600 Exp. 365,000 Min. 365,000 ???

Buffalo Bill Dam, Visitor Center, & Shoshone Powerplant

Water Year April-July Inflow (acre-feet) , , , , Forecasted 425,000 Avg 640,100 66% of Avg Basin above Buffalo Bill Reservoir Snow Water Equivalent Forecasted Min 350,000 55% of Avg

Water Year JanuaryFebruaryMarchAprilMayJune Actual Inflow ,000540,000550, , , ,000430,000400,000375,000400,000360,000374, , ,000500,000550,000530,000552, ,000550, ,000560,000540,000667, ,000530, ,000350,000400,000387, ,000450,000425,000400, ,000513, ,000650, ,000500,000470,000545, , ,000425,000??? Buffalo Bill Reservoir Forecasted April-July Inflow (acre-feet)

Water Year April-July Inflow (acre-feet) , , , , Forecast 425,000 Avg 640,100 Basin above Buffalo Bill Reservoir SWE Comparison to Past Years

Water Year Apr-Jul Inflow (acre-feet) Avg 1 Apr-Jul Inflow (acre-feet) Annual Inflow (acre-feet) Average 1 Annual Inflow (acre-feet) , ,100 ( avg.) 716,600 ( avg.) 664, ,100 ( avg.) 914,000 ( avg.) ,800507, ,500665, ,900782, ,000561, ,400680, ,900701, Expected 425,000 Min 350,000 Expected 579,000 Min 504,000 Buffalo Bill Reservoir Inflow 1 30-year average

Water Year Outflow (acre-feet) Average 1 Outflow (acre-feet) ,500 (wr 350 cfs) 814, ,100 (wr 350 cfs) ,600 (wr 100 cfs) ,400 (wr 100 cfs) ,800 (wr 100 cfs) ,300 (wr 150 cfs) ,200 (wr 200 cfs) 2007 Expected 630,000 Min 630,000 (wr 150 cfs) Buffalo Bill Reservoir Outflow 1 30-year average wr = winter release

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

Note: Symbols represent typical reservoir uses. Boysen Reservoir Allocations

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

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