Clean Lakes Program: North Twin - Lagrange County

 

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Indiana Clean Lakes Program Lake Report

North Twin

 

Lagrange County

1989

         
Sample Location: Deep Hole
Sample Date: 1989-07-31
Year
Max Depth
(m)
Secchi
(m)
Light 3'
(%)
1% Light Level
(ft)
DO @5'
(%)
pH
Epi
pH
Hypo
Cond
Epi
Cond
Hypo
Alk
Epi
Alk
Hypo
SRP
Epi
SRP
Hypo
TP
Epi
TP
Hypo
Chl-a
(ug/L)
NO3
Epi
NO3
Hypo
NH3
Epi
NH3
Hypo
TKN
Epi
TKN
Hypo
1989
11.6
2.4
54
30
97
8.3
7.4
370
370
126
160
0.01
0.01
0.086
0.079
0.959
0.394
0.082
0.976
0.554
1.316
Depth (m)
 0 
 1 
1.5
 2 
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Temp (oC)
24
24
24
24
22
18.5
14.5
12
11
10
9.5
DO (mg/L)
8.2
8.1
8.2
8.1
8
9.3
6.3
1.8
0.2
0.2
0.1
                                                                           
% Water Column Oxic: 90.9
 
Blue-Green Dominance (% of NU): 44
 
          Carlson TSI: 58
                    Indiana TSI: 9
                                                                           
Blue-Greens (#/L): 285   Greens (#/L): 0   Diatoms (#/L): 12   Other Algae (#/L): 186   Rotifers (#/L): 160   Zooplankton (#/L): 0
 
 

1993

         
Sample Location: Deep Hole
Sample Date: 1993-07-20
Year
Max Depth
(m)
Secchi
(m)
Light 3'
(%)
1% Light Level
(ft)
DO @5'
(%)
pH
Epi
pH
Hypo
Cond
Epi
Cond
Hypo
Alk
Epi
Alk
Hypo
SRP
Epi
SRP
Hypo
TP
Epi
TP
Hypo
Chl-a
(ug/L)
NO3
Epi
NO3
Hypo
NH3
Epi
NH3
Hypo
TKN
Epi
TKN
Hypo
1993
11.6
1.8
52
32
92
8.2
7.6
385
360
150
186.8
0.01
0.01
0.01
0.01
0.74
0.489
0.097
0.04
0.532
0.505
0.518
Depth (m)
 0 
 1 
1.5
 2 
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Temp (oC)
25
25
25
25
25
24
22.5
19.5
16
14
12
11.5
10.5
DO (mg/L)
8
8
7.9
7.9
7.9
7.6
7.7
7.5
4.5
1.5
0.2
0.1
0.1
                                                                           
% Water Column Oxic: 80.4
 
Blue-Green Dominance (% of NU): 88
 
          Carlson TSI: 39
                    Indiana TSI: 12
                                                                           
Blue-Greens (#/L): 1903   Greens (#/L): 28   Diatoms (#/L): 17   Other Algae (#/L): 155   Rotifers (#/L): 52   Zooplankton (#/L): 0
 
 

2000

         
Sample Location: Deep Hole
Sample Date: 2000-07-06
Year
Max Depth
(m)
Secchi
(m)
Light 3'
(%)
1% Light Level
(ft)
DO @5'
(%)
pH
Epi
pH
Hypo
Cond
Epi
Cond
Hypo
Alk
Epi
Alk
Hypo
SRP
Epi
SRP
Hypo
TP
Epi
TP
Hypo
Chl-a
(ug/L)
NO3
Epi
NO3
Hypo
NH3
Epi
NH3
Hypo
TKN
Epi
TKN
Hypo
2000
11.6
1.7
35
29
80.2
8.3
7.7
414.4
128
171
0.01
0.01
0.025
0.032
0.56
0.281
0.059
0.425
0.562
0.443
1.27
Depth (m)
 0 
 1 
1.5
 2 
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Temp (oC)
26.3
26.6
26.6
26.6
26
24.7
22.3
17
14.3
12.1
10.8
10.4
10.1
DO (mg/L)
6.66
6.5
6.5
6.55
6.51
6.7
6.4
6.9
5
1.5
0.3
0.3
0.3
                                                                           
% Water Column Oxic: 73
 
Blue-Green Dominance (% of NU): 30
 
          Carlson TSI: 43
                    Indiana TSI: 6
                                                                           
Blue-Greens (#/L): 687   Greens (#/L): 360   Diatoms (#/L): 622   Other Algae (#/L): 327   Rotifers (#/L): 229   Zooplankton (#/L): 73.7
 
 

2014

         
Sample Location: Deep Hole
Sample Date: 2014-06-23
Year
Max Depth
(m)
Secchi
(m)
Light 3'
(%)
1% Light Level
(ft)
DO @5'
(%)
pH
Epi
pH
Hypo
Cond
Epi
Cond
Hypo
Alk
Epi
Alk
Hypo
SRP
Epi
SRP
Hypo
TP
Epi
TP
Hypo
Chl-a
(ug/L)
NO3
Epi
NO3
Hypo
NH3
Epi
NH3
Hypo
TKN
Epi
TKN
Hypo
2014
2.2
8.4
8.2
378
411
151
167
0.01
0.01
0.023
0.023
1.79
0.304
0.383
0.083
0.277
0.59
0.695
Depth (m)
 0 
 1 
1.5
 2 
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Temp (oC)
25.61
25.67
25.67
25.09
23.88
18.95
16.78
14.67
13.59
12.85
DO (mg/L)
7.78
7.69
7.76
7.95
8.42
14.74
14.32
11
7.6
6.22
                                                                           
% Water Column Oxic:
 
Blue-Green Dominance (% of NU):
 
Blue-Green Dominance (% of cells):
          Carlson TSI: 45
                   
                                                                           
Blue-Greens (#/L):   Greens (#/L):   Diatoms (#/L):   Other Algae (#/L):   Rotifers (#/L):   Zooplankton (#/L):
Blue-Greens (cells/L):   Greens (cells/L):   Diatoms (cells/L):   Other Algae (cells/L):   Rotifers (cells/L):   Zooplankton (cells/L):
 
 

 

In 2011 CLP changed plankton sampling methods, thus the Indiana TSI is no longer calculated.
Epi
Epilimnion
Alk
Alkalinity (mg CaCO3/L)
DO
Dissolved Oxygen (mg/L)
NH3
Ammonia (mg-N/L)
SRP
Soluable Reactive Phosphorus (mg-P/L)
Hypo
Hypolimnion
Chl-a
Chlorophyll-a (ug/L)
Light 3'
Percent light penetration at 3ft
NO3
Nitrate (mg-N/L)
TP
Total Phosphorus (mg-P/L)
   
Cond
Conductivity
1% Light Level
Depth of the 1% light level (ft)
TKN
Total Kjeldahl Nitrogen (mg-N/L)
Temp
Temperature (oC)