Dissolved Oxygen and Temperature
Depth Profiles - 2014 
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Sampling Site A
 
 Depth, M
 Temp, C Dissolved Oxygen (mg/L)
0.5
25.0 
8.7 
1.0
25.0 
8.7 
2.0
25.0 
8.7 
3.0
25.0 
8.7 
4.0
24.6 
7.5 
5.0
22.1 
4.5 
6.0
19.6 
0.3 
7.0
18.4 
0.10 
8.0
16.2 
0.02 
9.0
15.1 
0.02 
10
Bottom 
Bottom 
 
 
 
Sampling Site B
 
 Depth, M
 Temp, C Dissolved Oxygen (mg/L)
0.5
23.5 
8.3 
1.0
23.4 
8.2 
2.0
23.4
8.1 
3.0
23.4 
8.1 
4.0
23.4 
8.0 
5.0
23.4 
8.0 
6.0
23.3 
7.9 
7.0
19.2
0.18 
8.0
17.3 
0.08 
9.0
15.8
0.03 
9.5
15.2 
0.01 
Water Sampling Locations
The results reported here were obtained as part of the Broad-scale Fisheries Monitoring Program which was carried out in July of 2014, and published by the Ontario Ministry of Natural Resources and Forestry, 2014.
 
These results show that an anoxic (oxygen depleted) zone exits in White Lake.  The effects of low dissolved oxygen content of lake water may trigger the release of phosphorus (internal loading) from sediments. An excellent discussion of this effect is provided in the following publication:
 
Twin Lake Phosphorus Internal Loading Investigation; Bassett Creek Watershed Management Commission, March 2011
 
Oxygen levels in White Lake waters have been previoiusly measured and found to be low in late summer causing concern that increased phosphorous levels in water could partly be the result of phosphorous entering the water (up to the surface) from lake sediments, which generally have phosphorous concentrations orders of magnitude greater than phosphorous concentrations found in the lake water itself.
Site A
Sampling Date:    July 2, 2014
Latitude: 45.280702
Longitude: 76.525767
Secchi Depth: 2.9 M
A
B
Site b
Sampling Date:    July 7, 2014
Latitude: 45.279947
Longitude: 76.519002
Secchi Depth: 2.9 M