Clean Lakes Program: Hoffman - Kosciusko County

 

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Indiana Clean Lakes Program Lake Report

Hoffman

  

Kosciusko County

1989

          
Sample Location: Deep Hole
Sample Date: 1989-08-15
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
10.4
1.4
38
20
124
8.4
7.4
580
480
180
230
0.01
0.012
0.02
0.109
3.636
6.201
0.045
2.225
1.132
3.75
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
23.7
23
22
21
18.8
16.2
15.3
DO (mg/L)
10.5
10.4
10.4
9.4
7.2
5.3
1.9
0.1
0.1
0.1
                                                                           
% Water Column Oxic: 70
  
Blue-Green Dominance (% of NU): 92
  
          Carlson TSI: 51
                    Indiana TSI: 36
                                                                           
Blue-Greens (#/L): 2191   Greens (#/L): 75   Diatoms (#/L): 0   Other Algae (#/L): 30   Rotifers (#/L): 77   Zooplankton (#/L): 0
 
 

1994

          
Sample Location: Deep Hole
Sample Date: 1994-08-16
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
1994
10.4
1.4
40
12
135
8.5
7.5
525
610
166.3
279.8
0.01
0.046
0.01
0.092
7.43
1.09
0.1
0.047
2.27
0.564
3.03
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
24
23
23
22.5
22.2
22
21
19.5
17.5
16.5
DO (mg/L)
9.8
11.5
11.6
11.2
9.7
8.2
7.7
5.5
0.1
0.1
0.1
                                                                           
% Water Column Oxic: 66
  
Blue-Green Dominance (% of NU): 37
  
          Carlson TSI: 47
                    Indiana TSI: 25
                                                                           
Blue-Greens (#/L): 3239   Greens (#/L): 200   Diatoms (#/L): 377   Other Algae (#/L): 4548   Rotifers (#/L): 0   Zooplankton (#/L): 361
 
 

1998

          
Sample Location: Deep Hole
Sample Date: 1998-07-28
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
1998
10.4
1.25
35
13.5
124
8.32
7.4
577
559
160.2
255.6
0.01
0.013
0.027
0.071
9.77
1.582
0.055
0.082
1.858
0.682
2.479
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
26.2
26.2
26.2
26.1
24.7
22.3
18.9
17.2
16.1
15.6
DO (mg/L)
9.85
9.92
9.89
9.85
9.65
8.29
1.73
0.02
0.01
0
0
                                                                           
% Water Column Oxic: 55.6
  
Blue-Green Dominance (% of NU): 63
  
          Carlson TSI: 54
                    Indiana TSI: 32
                                                                           
Blue-Greens (#/L): 1681   Greens (#/L): 418   Diatoms (#/L): 300   Other Algae (#/L): 182   Rotifers (#/L): 55   Zooplankton (#/L): 29.6
 
 

2004

          
Sample Location: Deep Hole
Sample Date: 2004-07-12
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
2004
9.4
1.6
67
13.8
143
8.6
8.5
618
555
163
165
0.015
0.012
0.018
0.029
9.98
3.858
3.843
0.03
0.109
0.87
0.963
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)
27.1
27.1
27
26.1
24.7
22.6
20.5
18.6
17.2
16.2
DO (mg/L)
11.4
11.5
11.4
11
9.2
4.5
0.4
1.3
0.01
0
                                                                           
% Water Column Oxic: 50
  
Blue-Green Dominance (% of NU): 8.9
  
          Carlson TSI: 51
                    Indiana TSI: 13
                                                                           
Blue-Greens (#/L): 183   Greens (#/L): 46   Diatoms (#/L): 233   Other Algae (#/L): 1479   Rotifers (#/L): 91   Zooplankton (#/L): 26.8
 
 

2008

          
Sample Location: Site 1
Sample Date: 2008-06-30
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
2008
7
1.3
19
11
79.1
8.1
7.6
502
493
171
192
0.01
0.01
0.034
0.051
19.63
2.01
1.71
0.082
0.452
0.986
0.938
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)
22.3
22.2
21.9
21.8
21.8
20.2
19.5
18.8
16.6
DO (mg/L)
7
7.8
7.6
7.5
7.4
2.6
1.1
1.1
0
                                                                           
% Water Column Oxic: 85.7
  
Blue-Green Dominance (% of NU): 8.5
  
          Carlson TSI: 57
                    Indiana TSI: 19
                                                                           
Blue-Greens (#/L): 549   Greens (#/L): 1670   Diatoms (#/L): 1830   Other Algae (#/L): 2150   Rotifers (#/L): 274   Zooplankton (#/L): 8.8
 
 

2008

          
Sample Location: Site 2
Sample Date: 2008-06-30
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
2008
9
1.2
19
12.7
104.3
8.4
7.6
492
484
162.5
218.5
0.01
0.012
0.024
0.051
14.53
2
0.182
0.072
1.02
0.835
1.575
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)
23.1
23.1
23.1
23
22.9
22.8
19.8
18.3
16
14.8
DO (mg/L)
8.9
8.7
8.8
8.6
8.5
8.2
0.71
0
0
0
                                                                           
% Water Column Oxic: 44.4
  
Blue-Green Dominance (% of NU): 26.1
  
          Carlson TSI: 55
                    Indiana TSI: 23
                                                                           
Blue-Greens (#/L): 3700   Greens (#/L): 3277   Diatoms (#/L): 2907   Other Algae (#/L): 3753   Rotifers (#/L): 529   Zooplankton (#/L): 8.3
 
 

2010

          
Sample Location: Deep Hole
Sample Date: 2010-08-17
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
2010
9.5
1.2
12
3.9
106.4
8.4
7.4
451
526
143
311
0.01
0.029
0.031
0.051
14.42
0.099
0.013
0.048
2.954
0.905
4.551
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)
26.8
26.8
26.8
26.8
26.8
26.5
25.3
20.6
18.1
16.5
15.8
DO (mg/L)
8.4
8.3
8.6
8.4
8.3
7.3
0.1
0
0
0
0
                                                                           
% Water Column Oxic: 42
  
Blue-Green Dominance (% of NU): 51.7
  
Blue-Green Dominance (% of cells): 55.6
           Carlson TSI: 56
                    Indiana TSI: 57
                                                                           
Blue-Greens (#/L): 2483258   Greens (#/L): 633314   Diatoms (#/L): 666647   Other Algae (#/L): 683313   Rotifers (#/L): 0   Zooplankton (#/L): 11.4
Blue-Greens (cells/L): 33796   Greens (cells/L): 30282   Diatoms (cells/L): 667   Other Algae (cells/L): 683   Rotifers (cells/L): 0   Zooplankton (cells/L): 0
 
 

2012

          
Sample Location: Deep Hole
Sample Date: 2012-07-18
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
2012
9.1
1.45
38.9
18
49.5
8.6
7.4
496
470
136
268
0.01
0.124
0.027
0.162
8.04
0.022
0.046
0.018
2.301
0.61
3.09
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)
30.3
29.4
29
28.7
28.1
27.5
26
23.1
17.3
15.8
15
DO (mg/L)
4.1
4.18
3.77
3.68
3.48
3.32
1.25
0.08
0.05
0.02
0.01
                                                                           
% Water Column Oxic: 55.6
  
Blue-Green Dominance (% of NU): 81.8
  
Blue-Green Dominance (% of cells): 18.2
           Carlson TSI: 59
                   
                                                                           
Blue-Greens (#/L): 681959   Greens (#/L): 1421958   Diatoms (#/L): 1218821   Other Algae (#/L): 420783   Rotifers (#/L): 1201   Zooplankton (#/L): 726
Blue-Greens (cells/L): 19661   Greens (cells/L): 2729   Diatoms (cells/L): 1220   Other Algae (cells/L): 421   Rotifers (cells/L): 1   Zooplankton (cells/L): 1
 
 

 

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)