2017
The ice went out of the lake this year April 23/24. Water samples were taken at the 3 traditional sites on April 29th. While the phosphate results appear to indicate an alarming increase over last year, a review of past results does show peaks of equivalent magnitude at times as well. Perhaps the most disconcerting, and related issue, is the constantly increasing spread of Eurasian Milfoil in the lake.
For more detail see the 2017 Spring Newsletter.
2016 Results
Spring 2016 the ice went out on April 22. Water samples were taken on April 30 at 3 sites to test for Phosphorous. 3 samples were taken at each site and then averaged with the following results: Culbute basin 9; North basin 8.3; South basin 8.7. At the same time Secchi Disk readings were taken and at each site the readings were 5.0m or more (the rope only goes to 5.0m) According to standards used by the OME, these results mean that Grand Lake is OLIGOTROPHIC: “clear water with very low levels of phosphorous, algae and nutrients”. GOOD NEWS ON BOTH FRONTS!
E-coli tests will be done in August.
If anyone is interested in getting involved with a view to taking over the water testing program, please contact the Association.
It also would be good if someone from Green/Mountain Lake would volunteer because it is hard to get a boat through the channel from Grand.
Previous Tests
|
Années/Years |
2007 |
2008 |
2009 |
2010 |
2011 |
2012 |
2013 |
Moyenne/ Average |
|
Lac/Lake |
||||||||
|
Achigan |
3 |
6,3 |
– |
3,3 |
6,3 |
7,3 |
6,0 |
5,4 |
|
Baie Mud |
– |
– |
– |
11,3 |
– |
– |
– |
11,3 |
|
Barnes |
9,2 |
– |
6,6 |
5 |
11,7 |
9 |
15,7 |
9,5 |
|
Bataille |
11 |
5 |
11,7 |
4,6 |
14 |
9,5 |
9,5 |
9,3 |
|
Bonin |
6,5 |
– |
– |
– |
2 |
– |
– |
4,3 |
|
Bois-Franc |
– |
– |
5,6 |
– |
2 |
– |
– |
3,8 |
|
Brassard |
7 |
4 |
7,6 |
3,8 |
2,3 |
7 |
6,7 |
5,5 |
|
Champeau |
4,7 |
11,7 |
6 |
6 |
7,7 |
17,3 |
– |
8,9 |
|
Chevreuil |
5 |
– |
9 |
7,3 |
15,3 |
10,6 |
– |
9,4 |
|
Clair |
4 |
4,4 |
– |
2 |
8 |
– |
4,7 |
4,6 |
|
Corrigan |
– |
– |
3,6 |
10,3 |
11,7 |
9,6 |
9,0 |
8,8 |
|
Dam |
– |
– |
5,8 |
– |
10,7 |
21,3 |
– |
12,6 |
|
Des Chutes |
– |
– |
– |
– |
18,3 |
– |
– |
18,3 |
|
Dodds |
3 |
– |
– |
– |
– |
– |
– |
3,0 |
|
Écluse |
– |
3,2 |
– |
– |
– |
– |
– |
3,2 |
|
Épinettes |
4,3 |
– |
3,6 |
7,3 |
8 |
8,7 |
6,7 |
6,4 |
|
Gilmour |
12,1 |
3 |
8,1 |
8 |
13 |
35 |
7,7 |
12,4 |
|
Girard |
9,3 |
4,5 |
3,3 |
2 |
12 |
– |
9,0 |
6,7 |
|
Grand |
13,6 |
7,6 |
9,2 |
8,3 |
17,3 |
11,5 |
9,5 |
11,0 |
|
Hardwood |
2,4 |
2 |
2,7 |
2,3 |
6 |
8,3 |
5,7 |
4,2 |
|
Lachaine |
– |
16 |
– |
– |
– |
– |
– |
16,0 |
|
Létourneau |
6,7 |
6 |
– |
– |
6 |
– |
– |
6.2 |
|
Louise |
6 |
– |
3,3 |
3,3 |
9 |
7,3 |
6,7 |
5,9 |
|
Main |
– |
– |
– |
– |
14 |
– |
– |
14,0 |
|
Marbre |
3,2 |
4,5 |
– |
4 |
3,3 |
9,3 |
6,5 |
5,1 |
|
Maskinongé |
– |
13,3 |
4,5 |
7,5 |
12,3 |
14,3 |
9,0 |
10,2 |
|
McArthur |
5,7 |
5,7 |
5,6 |
5,5 |
8,3 |
2 |
7,0 |
5,7 |
|
McFee |
5 |
2 |
– |
2 |
6,6 |
5,1 |
4,5 |
4,2 |
|
McGlashan |
5,7 |
4 |
2 |
3 |
10,7 |
– |
6,7 |
5,3 |
|
McGregor |
16,5 |
7,6 |
11,3 |
5,3 |
18 |
– |
4,2 |
10,5 |
|
McMullin |
25 |
18 |
– |
– |
28 |
– |
– |
23,7 |
|
McNicole |
– |
– |
– |
– |
12,3 |
– |
– |
12,3 |
|
Perdrix |
22 |
– |
16,3 |
25,8 |
18,2 |
25,7 |
8,7 |
19,4 |
|
Petit Lac Clair |
6 |
9,3 |
6,6 |
7,3 |
– |
– |
– |
7,3 |
|
Rhéaume |
16,2 |
– |
13,7 |
7 |
14,7 |
13,1 |
10,8 |
12,6 |
|
Robinson |
– |
11 |
– |
– |
– |
– |
– |
11,0 |
|
St-Antoine |
– |
– |
– |
– |
10,7 |
– |
13,4 |
12,1 |
|
St-Germain |
2,7 |
2 |
2,5 |
2,8 |
7 |
8 |
6,4 |
4,5 |
|
St-Pierre |
7,3 |
8,2 |
9,1 |
– |
13 |
20,9 |
8,4 |
11,2 |
|
TenPenny |
– |
– |
4,3 |
11,3 |
7 |
27 |
2,0 |
10,3 |
|
Truite |
– |
3,3 |
14,6 |
3,7 |
9,7 |
5,6 |
8,3 |
7,5 |
|
Twin |
6,7 |
– |
– |
– |
– |
– |
– |
6,7 |
| Figure 1 : Phosphore des lacs en µg.L-1 (23 lacs échantillonnés en 2013 | ||||||||
