USGS Scientific Investigations Report 2009-5184Water Budgets for Coeur d’Alene Lake, Idaho, Water Years 2000

Table 5. Change in storage and summary of mean monthly storage, Coeur d’Alene Lake, Idaho, water years 2000–2005.

[Abbreviations: ft, foot; ft³, cubic foot; acre-ft, acre-foot; –, not applicable]

Water year	January	February	March	April	May	June	July	August	September	October	November	December	Water year change (million ft³)	Water year change (acre-ft)
Change in storage (above 2,100 ft elevation) using mean monthly stage, converted to acre-ft, and subtracted from previous month
1999	–	–	–	–	–	–	–	–	–	-60,220	-22,310	10,630	–	–
2000	-60,540	30,810	42,250	151,020	-58,400	-23,370	7,050	0	-11,160	-60,380	-67,190	-45,190	251	5,760
2001	-22,850	2,160	31,760	71,240	98,790	470	5,210	-960	-18,380	-52,220	-27,180	-25,440	-231	-5,320
2002	3,040	-22,070	35,430	3,310	171,740	-6,630	-66,320	6,160	-19,820	-64,020	-47,060	-18,290	0	0
2003	-11,070	75,860	-12,890	36,610	-19,800	77,610	950	480	-20,980	-45,270	-61,320	-31,250	-113	-2,600
2004	5,940	-5,130	46,570	51,580	11,450	47,930	-1,420	2,860	-6,150	-64,540	-31,080	21,770	688	15,790
2005	-45,560	-4,050	-25,040	102,510	36,320	13,900	1,920	-2,390	-24,230				-892	-20,470

Average monthly storage for period of study (acre-ft)	-21,840	12,930	19,680	69,378	40,017	18,318	-8,768	1,025	-16,787	-57,775	-42,690	-14,628		-1,140
Average monthly storage for period of study, million ft³	-951	563	857	3,022	1,743	798	-382	45	-731	-2,517	-1,860	-637	-49	–
Net mean monthly change (as calculated from previous month), for period of study	–	1,515	294	2,165	-1,279	-945	-1,180	427	-776	-1,785	657	1,222	–	–

Summary of mean monthly storage, in acre-ft, for Coeur d’Alene Lake  (above 2,100 ft elevation) using mean monthly stage, converted to acre-ft														Water year average storage (acre-ft)
1999	–	–	–	–	–	–	–	–	215,840	155,620	133,310	143,940		–
2000	83,400	114,210	156,460	307,480	249,080	225,710	232,760	232,760	221,600	161,220	94,030	48,840		188,028
2001	25,990	28,150	59,910	131,150	229,940	230,410	235,620	234,660	216,280	164,060	136,880	111,440		141,350
2002	114,480	92,410	127,840	131,150	302,890	296,260	229,940	236,100	216,280	152,260	105,200	86,910		179,978
2003	75,840	151,700	138,810	175,420	155,620	233,230	234,180	234,660	213,680	168,410	107,090	75,840		163,126
2004	81,780	76,650	123,220	174,800	186,250	234,180	232,760	235,620	229,470	164,930	133,850	155,620		160,506
2005	110,060	106,010	80,970	183,480	219,800	233,700	235,620	233,230	209,000	158,420	115,830	58,560		172,189

Average (acre-ft)	81,925	94,855	114,535	183,913	223,930	242,248	233,480	234,505	217,718	161,550	115,480	89,535		167,529

Water Budgets for Coeur d’Alene Lake, Idaho, Water Years 2000–2005