Total Nitrogen (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

Total

N

 

(mg/L)

SE

 

Year

 

 

Principal

Investigator

Sampling

Period

 

Number

of

lake sampling

sites

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

1990

Bachmann

5/27 to

7/29

3

9

0.80

0.04

1990

Bachmann

5/27 to

7/29

3

9

2.00

0.23

1993

Lang

6/5 to

8/20

3

18

0.89

0.03

99

99

99

99

99

99

1994

Lang

6/26 to

8/30

3

18

0.74

0.02

99

99

99

99

99

99

1995

Lang

6/4 to

8/6

3

15

0.75

0.02

99

99

99

99

99

99

1996

Lang

6/14 to

8/5

3

12

0.56

0.01

99

99

99

99

99

99

1997

Lang

6/21 to

8/3

3

12

0.75

0.03

99

99

99

99

99

99

1999

CLAMP

6/17 to

8/25

6

36

1.26

0.08

1999

CLAMP

6/17 to

8/31

5

30

2.53

0.17

2000

CLAMP

6/7 to

8/31

6

42

 

1.03

0.08

2000

CLAMP

6/2 to

8/20

5

35

2.61

0.17

2001

CLAMP

6/14 to

8/22

6

36

0.73

0.03

2001

CLAMP

6/10 to

8/22

5

25

1.55

0.06

2002

CLAMP

6/5 to

8/23

6

42

0.81

0.03

2002

CLAMP

6/5 to

8/28

5

35

1.40

0.06

2003

CLAMP

6/11 to

8/20

6

36

0.95

0.03

2003

CLAMP

6/8 to

8/21

5

30

2.01

0.11

 

                Big Spirit Lake

                Upper Gar Lake

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

 

 

Number

of

lake sampling

sites

 

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

 

Year

 

Principal

Investigator

Sampling

Period

 

Number

of

lake sampling

sites

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

1990

Bachmann

5/26 to

7/28

3

9

1.30

0.13

1990

Bachmann

5/27 to

7/29

3

9

2.80

0.24

1999

CLAMP

6/18 to

8/20

5

25

1.57

0.11

1999

CLAMP

6/17 to

8/25

1

5

2.54

0.44

2000

CLAMP

6/7 to

8/31

5

35

1.25

0.07

2000

CLAMP

6/2 to

8/25

1

7

2.15

0.07

 

2001

CLAMP

6/8 to

8/20

5

30

0.93

0.05

2001

CLAMP

6/8 to

8/22

1

6

1.56

0.14

2002

CLAMP

6/7 to

8/28

5

35

0.96

0.04

2002

CLAMP

6/5 to

8/28

1

7

1.23

0.08

2003

CLAMP

6/5 to

8/19

5

29

1.57

0.08

2003

CLAMP

6/12 to

8/30

1

6

1.80

0.19

 

              Lake Minnewashta

                Lower Gar Lake

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

 

 

Number

of

lake sampling

sites

 

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

 

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

Number

of

lake sampling

sites

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

1990

Bachmann

5/27 to

7/29

3

9

2.40

0.23

1990

Bachmann

5/27 to

7/29

3

9

3.00

0.23

1999

CLAMP

7/14 to

8/25

1

4

1.99

0.20

1999

CLAMP

7/14 to

8/25

1

4

3.28

0.65

2000

CLAMP

6/2 to

8/25

1

7

2.55

0.18

2000

CLAMP

6/2 to

8/25

1

7

2.82

0.33

2001

CLAMP

6/8 to

8/22

1

6

1.59

0.06

2001

CLAMP

6/8 to

8/22

1

6

1.82

0.09

2002

CLAMP

6/5 to

8/28

1

7

1.55

0.17

2002

CLAMP

6/5 to

8/28

1

7

1.87

0.18

2003

CLAMP

6/12 to

8/30

1

6

2.10

0.09

2003

CLAMP

6/12 to

8/30

1

6

2.75

0.44

 

              Little Spirit Lake

                Center Lake

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

 

 

Number

of

lake sampling

sites

 

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

 

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

Number

of

lake sampling

sites

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

1990

Bachmann

May to

August

3

9

3.3

0.19

1990

Bachmann

5/26 to

7/28

3

9

3.30

0.40

NANA

NNAA

NNAA

NNAA

NNA

NA

1999

CLAMP

 

7/18 to

8/29

2

7

3.34

0.60

2000

CLAMP

6/24 to

8/19

2

10

3.47

0.34

2000

CLAMP

6/11 to

8/13

2

6

3.53

0.68

2001

CLAMP

6/9 to

8/11

2

10

3.17

0.27

2001

CLAMP

7/8 to

8/25

2

8

3.34

0.31

2002

CLAMP

6/5 to

8/23

2

14

4.99

0.59

2002

CLAMP

6/9to

8/19

2

12

2.86

0.31

2003

CLAMP

6/11 to

8/18

2

12

4.61

0.47

2003

CLAMP

6/15to

8/31

2

12

2.87

0.16

 

              Silver Lake

 

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

 

 

Number

of

lake sampling

sites

 

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

 

 

 

 

 

 

 

1990

Bachmann

5/26 to

7/28

3

9

2.40

0.13

 

 

 

 

 

 

1999

CLAMP

 

7/30 to

8/26

4

12

2.23

0.13

 

 

 

 

 

 

2000

CLAMP

6/6 to

8/22

4

23

3.52

0.29

 

 

 

 

 

 

2001

CLAMP

6/5 to

8/28

4

28

5.48

0.41

 

 

 

 

 

 

2002

CLAMP

6/11 to

8/20

4

24

2.33

0.20

 

 

 

 

 

 

2003

CLAMP

6/10 to

8/19

4

24

3.11

0.17

 

 

 

 

 

 

 

              Elk Lake

                Trumbull Lake

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

 

 

Number

of

lake sampling

sites

 

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

 

Year

 

 

Principal

Investigator  

   

 

Sampling

Period

 

Number

of

lake sampling

sites

 

Total

number

of

samples

collected

Avg

Total

N

 

(mg/L)

SE

NA

NA

NA

NA

NA

NA

1990

Bachmann

May to

Aug

3

9

3.30

0.12

2000

CLAMP

6/20 to

8/16

1

3

5.80

0.30

2000

CLAMP

6/20 to

8/16

1

3

5.37

0.31

2001

CLAMP

6/13 to

8/16

1

3

4.93

0.53

2001

CLAMP

6/13 to

8/16

1

3

6.11

1.56

2002

CLAMP

7/22 to

8/26

1

2

6.28

0.26

2002

CLAMP

7/223 to

8/26

1

2

3.47

0.5