Clean Lakes Program: Brokesha - Lagrange County

 

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Indiana Clean Lakes Program Lake Report

Brokesha

  

Lagrange County

1990

          
Sample Location: Deep Hole
Sample Date: 1990-07-09
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
1990
5.5
2.8
70
17
100
7.6
7
300
305
131.1
162.2
0.01
0.01
0.026
0.029
2.16
0.151
0.123
0.027
0.043
0.951
0.861
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)
25.3
25
23.5
18.1
15.5
13.4
DO (mg/L)
8.3
8.3
9.3
3.5
0.3
0.1
                                                                           
% Water Column Oxic: 83
  
Blue-Green Dominance (% of NU): 57
  
          Carlson TSI: 45
                    Indiana TSI: 15
                                                                           
Blue-Greens (#/L): 2353   Greens (#/L): 0   Diatoms (#/L): 311   Other Algae (#/L): 1353   Rotifers (#/L): 136   Zooplankton (#/L): 0
 
 

1993

          
Sample Location: Deep Hole
Sample Date: 1993-07-12
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
5.5
3.3
54
18
91
8
7.5
310
310
131
155.5
0.01
0.01
0.019
0.022
0.027
0.067
0.024
0.039
0.392
0.303
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)
27.5
27.5
27
27
23.5
19
15
12
DO (mg/L)
7.8
7.6
7.5
7.5
8
3.5
0.3
0.1
                                                                           
% Water Column Oxic: 82
  
Blue-Green Dominance (% of NU): 76
  
          Carlson TSI: 45
                    Indiana TSI: 14
                                                                           
Blue-Greens (#/L): 7655   Greens (#/L): 728   Diatoms (#/L): 256   Other Algae (#/L): 1318   Rotifers (#/L): 112   Zooplankton (#/L): 0
 
 

2000

          
Sample Location: Deep Hole
Sample Date: 2000-07-24
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
5.5
3.2
20
17
110.9
8.4
296.8
124
0.01
0.029
1.05
0.022
0.018
0.802
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)
26.2
26
25
24.8
24.7
24.3
22.3
DO (mg/L)
9.41
9.4
9.14
9.2
9.63
7.91
0.83
                                                                           
% Water Column Oxic: 100
  
Blue-Green Dominance (% of NU): 23
  
          Carlson TSI: 42
                    Indiana TSI: 6
                                                                           
Blue-Greens (#/L): 265   Greens (#/L): 0   Diatoms (#/L): 41   Other Algae (#/L): 820   Rotifers (#/L): 8   Zooplankton (#/L): 8.5
 
 

2003

          
Sample Location: Deep Hole
Sample Date: 2003-07-14
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
2003
5.18
2.6
65
16
101.5
8.6
8.3
319.1
323.4
144
151
0.01
0.01
0.01
0.027
1.34
0.013
0.013
0.018
0.018
0.686
0.64
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)
27.3
27.3
27
25.9
25.4
23.7
8.6
8.3
7.3
7.8
7.4
5
DO (mg/L)
8.6
8.3
7.3
7.8
7.4
5
0
0
0
0
0
0
                                                                           
% Water Column Oxic: 100
  
Blue-Green Dominance (% of NU): 45
  
          Carlson TSI: 39
                    Indiana TSI: 5
                                                                           
Blue-Greens (#/L): 2477   Greens (#/L): 23   Diatoms (#/L): 1227   Other Algae (#/L): 1505   Rotifers (#/L): 208   Zooplankton (#/L): 23.9
 
 

2014

          
Sample Location: Deep Hole
Sample Date: 2014-07-21
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
5.79
2.7
55.71
15.09
7.8
8.2
279
336
134
131
0.01
0.01
0.031
0.026
2.32
0.013
0.013
0.018
0.032
0.698
0.648
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)
25.4
25.2
24.9
24.5
23
19.1
DO (mg/L)
4.88
5.31
4.29
4.18
3.18
0.67
                                                                           
% Water Column Oxic:
 
Blue-Green Dominance (% of NU): 97.7
  
Blue-Green Dominance (% of cells): 73.4
           Carlson TSI: 46
                   
                                                                           
Blue-Greens (#/L): 14330   Greens (#/L): 2136   Diatoms (#/L): 178   Other Algae (#/L): 2492   Rotifers (#/L): 311   Zooplankton (#/L): 84
Blue-Greens (cells/L): 340   Greens (cells/L): 6   Diatoms (cells/L): 0   Other Algae (cells/L): 2   Rotifers (cells/L): 0   Zooplankton (cells/L): 0
 
 

 

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)