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Michigan Administrative Code (Last Updated: November 16, 2016) |
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Department EQ. Environmental Quality |
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Water Resources Division |
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Chapter Water Resources Protection -- Part 4. Water Quality Standards |
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Part 4. WATER QUALITY STANDARDS |
Section 323.1070. Temperature of Great Lakes and connecting waters.
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(1) The Great Lakes and connecting waters shall not receive a heat load which would warm the receiving water at the edge of the mixing zone more than 3 degrees Fahrenheit above the existing natural water temperature.
(2) The Great Lakes and connecting waters shall not receive a heat load which would warm the receiving water at the edge of the mixing zone to temperatures in degrees Fahrenheit higher than the following monthly maximum temperature:
(a) Lake Michigan north of a line due west from the city of Pentwater.
J F M
A
M
J J A S
O
N
D
40 40 40
50
55
70 75 75 75
65
60
45
(b) Lake Michigan south of a line due west from the city of Pentwater.
J F
M
A
M
J
J
A
S
O
N
D
45 45
45
55
60
70
80
80
80
65
60
50
(c) Lake Superior and the St. Marys river:
J F
M
A
M
J
J
A
S
O
N
D
38 36
39
46
53
61
71
74
71
61
49
42
(d) Lake Huron north of a line due east from Tawas point:
J F
M
A
M
J
J A
S
O
N
D
40 40
40
50
60
70
75 80
75
65
55
45
(e) Lake Huron south of a line due east from Tawas point, except Saginaw bay.
J F
M
A
M
J
J
A
S
O
N
D
40 40
40
55
60
75
80
80
80
65
55
45
(f) Lake Huron, Saginaw bay:
J F
M
A
M
J
J
A
S
O
N
D
45 45
45
60
70
75
80
85
78
65
55
45
(g) St. Clair river:
J F
M
A
M
J
J
A
S
O
N
D
40 40
40
50
60
70
75
80
75
65
55
50
(h) Lake St. Clair:
J F
M
A
M
J
J
A
S
O
N
D
40 40
45
55
70
75
80
83
80
70
55
45
(i) Detroit river:
J F
M
A
M
J
J
A
S
O
N
D
40 40
45
60
70
75
80
83
80
70
55
45
(j) Lake Erie:
J F
M
A
M
J
J
A
S
O
N
D
45 45
45
60
70
75
80
85
80
70
60
50
History: 1979 AC; 1986 AACS.