chlorophyll a (Summer average, June - August)
West Okoboji Lake						East Okoboji Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE	Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
1971 Bachmann	6/28 to 8/19	6	31	5.0	0.3	1971 Bachmann	7/8 to 8/20	5	49	190.4	17.6
1972 Bachmann	6/12 to 8/26	6	48	3.9	0.3	1972 Bachmann	6/1 to 8/24	5	59	124.8	15.1
1973 Bachmann	6/3 to 8/25	6	58	3.4	0.2	1973 Bachmann	6/6 to 8/25	5	51	67.8	11.1
1979 Bachmann	Jun to Oct	1	14	6.3	1.0	1979 Bachmann	Jun to Oct	1	9	25.8	8.3
1987 Bachmann	6/2 to 8/13	6	66	3.5	0.2	NA	NA	NA	NA	NA	NA
1988 Bachmann	6/6 to 8/8	6	57	3.8	0.2	NA	NA	NA	NA	NA	NA
1989 Bachmann	6/4 to 8/6	6	60	3.2	0.2	NA	NA	NA	NA	NA	NA
1990 Bachmann	5/27 to 7/29	1	9	9.9	4.1	1990 Bachmann	5/27 to 7/29	1	9	35.7	9.4
1993 Lang	6/5 to 8/20	3	18	6.8	1.2	NA	NA	NA	NA	NA	NA
1994 Lang	6/26 to 8/30	3	18	6.9	0.6	NA	NA	NA	NA	NA	NA
1995 Lang	6/4 to 8/6	3	15	3.4	0.7	NA	NA	NA	NA	NA	NA
1997 Lang	6/21 to 8/3	3	12	2.1	0.2	NA	NA	NA	NA	NA	NA
1998 Lang	7/2 to 8/28	3	27	4.8	0.7	NA	NA	NA	NA	NA	NA
1999 CLAMP	6/17 to 8/25	6	33	5.0	0.3	1999 CLAMP	6/17 to 8/31	5	30	66.3	12.0
2000 CLAMP	6/7 to 8/31	6	42	4.1	0.2	2000 CLAMP	6/2 to 8/20	5	35	64.0	9.7
2001 CLAMP	6/14 to 8/22	6	36	6.3	0.5	2001 CLAMP	6/10 to 8/22	5	30	52.9	7.5
2002 CLAMP	6/5 to 8/26	6	36	3.8	0.4	2002 CLAMP	6/5 to 8/28	5	35	37.6	3.8
2003 CLAMP	6/11 to 8/20	6	36	3.3	0.3	2003 CLAMP	6/19 to 8/21	5	25	47.5	11.6
Big Spirit Lake						Upper Gar Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE	Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
1971 Bachmann	7/29 to 8/26	5	15	63.1	12.1	1971 Bachmann	7/8 to 8/23	1	11	126.3	21.8
1972 Bachmann	6/5 to 8/23	5	39	7.8	0.8	1972 Bachmann	6/1 to 8/25	1	10	81.5	32.8
1973 Bachmann	6/6 to 8/30	5	50	10.7	0. 9	1973 Bachmann	6/6 to 8/15	1	8	47.5	17.0
1979 Bachmann	Jun to Oct	1	9	46.2	5.2	1979 Bachmann	Jun to Oct	1	9	89.5	27.2
1990 Bachmann	5/26 to 7/28	1	9	15.6	2.7	1990 Bachmann	5/27 to 7/29	1	9	136.9	25.0
1999 CLAMP	6/18 to 8/6	5	20	11.8	0.9	1999 CLAMP	6/17 to 8/11	1	3	17.3	5.1
2000 CLAMP	6/7 to 8/31	5	35	18.6	3.7	2000 CLAMP	6/2 to 8/25	1	6	58.2	10.6
2001 CLAMP	6/8 to 8/20	5	29	15.0	2.1	2001 CLAMP	6/8 to 8/22	1	6	38.9	11.1
2002 CLAMP	6/7 to 8/28	5	35	21.6	2.3	2002 CLAMP	6/5 to 8/28	1	7	42.3	7.3
2003 CLAMP	6/5 to 8/19	5	29	40.3	4.4	2003 CLAMP	6/28 to 8/30	1	5	59.7	16.5
Lake Minnewashta						Lower Gar Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE	Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
1971 Bachmann	7/8 to 8/23	1	11	185.1	21.0	1971 Bachmann	7/15 to 8/23	1	9	329.5	33.8
1972 Bachmann	6/1 to 8/25	1	10	83.9	22.1	1972 Bachmann	6/1 to 8/25	1	10	127.5	29.4
1973 Bachmann	6/6 to 8/15	1	7	93.3	45.4	1973 Bachmann	6/6 to 8/15	1	7	138.8	61.4
1979 Bachmann	Jun to Oct	1	9	29.6	11.1	1979 Bachmann	Jun to Oct	1	9	72.6	7.2
1990 Bachmann	5/27 to 7/29	1	9	35.5	7.9	1990 Bachmann	5/27 to 7/29	1	9	33.0	8.5
1999 CLAMP	7/28 to 8/11	1	2	17.3	12.7	1999 CLAMP	7/28 to 8/11	1	2	53.4	4.5
2000 CLAMP	6/2 to 8/25	1	6	34.0	11.3	2000 CLAMP	6/2 to 8/25	1	6	40.3	9.9
2001 CLAMP	6/8 to 8/22	1	6	46.4	12.0	2001 CLAMP	6/8 to 8/22	1	6	47.3	15.1
2002 CLAMP	6/5 to 8/28	1	7	64.9	19.3	2002 CLAMP	6/5 to 8/28	1	7	63.6	21.3
2003 CLAMP	6/28 to 8/30	1	5	67.8	22.9	2003 CLAMP	*******	*******	*******		****
Little Spirit Lake						Center Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE	Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
1979 Bachmann	Jun to Oct	1	9	42.8	5.6	1979 Bachmann	Jun to Oct	1	6	90.3	9.2
1990 Bachmann	May to Aug	1	9	62.7	3.3	1990 Bachmann	5/26 to 7/28	1	9	33.0	4.2
NA	NA	NA	NA	NA	NA	1999 CLAMP	7/18 to 8/29	2	7	93.7	33.4
2000 CLAMP	6/24 to 8/19	2	10	125.9	19.4	2000 CLAMP	6/11 to 8/27	2	8	78.6	43.4
2001 CLAMP	6/9to 8/11	2	10	137.8	18.6	2001 CLAMP	7/8 to 8/25	2	6	97.9	37.6
2002 CLAMP	*******	*******	*******		****	2002 CLAMP	*******	*******	*******		****
2003 CLAMP	6/11to 8/18	2	12	182.8	47.7	2003 CLAMP	6/15 to 8/31	2	12	77.1	15.1
Silver Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
1979 Bachmann	Jun to Oct	1	10	34.1	13.4
1990 Bachmann	5/26 to 7/28	1	9	36.2	3.0
1999 CLAMP	7/30 to 8/12	4	8	45.9	8.5
2000 CLAMP	6/6 to 8/22	4	23	60.0	15.4
2001 CLAMP	6/5 to 8/28	4	26	71.2	26.3
2002 CLAMP	6/11 to 8/20	4	24	53.2	10.7
2003 CLAMP	6/10 to 8/19	4	24	75.5	18.1
Elk Lake						Trumbull Lake
Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE	Year Principal Investigator	Sampling Period	Number of lake sampling sites	Total number of samples collected	Avg chl a (mg/m^3)	SE
NA	NA	NA	NA	NA	NA	1979 Bachmann	Jun to Oct	1	11	131.3	16.2
NA	NA	NA	NA	NA	NA	1990 Bachmann	May to Aug	1	9	189.2	13.5
2000 CLAMP	6/20 to 8/16	1	3	201.1	31.8	2000 CLAMP	6/20 to 8/16	1	3	233.1	60.3
2001 CLAMP	6/13 to 8/16	1	3	167.8	68.8	2001 CLAMP	6/13 to 8/16	1	3	151.1	112.1
2002 CLAMP	7/22 to 8/20	1	2	249.1	9.5	2002 CLAMP	7/22 to 8/20	1	2	191.1	91.8
******* Insufficient Number Of Samples To Calculate A Reliable Summer Average