Administrative
Rules for
PART 4 Water Quality Standards
of the Natural Resources and Environmental Protection Act 1994 PA 451, as
amended
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(Effective December 13,
1973; revised December 2, 1986)
Rule 75.
(1) Rivers, streams, and
impoundments naturally capable of supporting coldwater fish shall not receive a
heat load which would do either of the following:
(a)
Increase the temperature of the receiving waters at the edge of the
mixing zone more than 2 degrees Fahrenheit above the existing natural water
temperature.
(b)
Increase the temperature of the receiving waters at the edge of the
mixing zone to temperatures greater than the following monthly maximum
temperatures:
J F M A M J J A S 0 N D
38 38 43
54 65 68 68 68
63 56 48 40
(2)
Rivers, streams, and impoundments naturally capable of supporting
warmwater fish shall not receive a heat load which would warm the receiving
water at the edge of the mixing zone more than 5 degrees Fahrenheit above the
existing natural water temperature.
(3)
Rivers, streams, and impoundments naturally capable of supporting
warmwater fish shall not receive a heat load which would warm the receiving
water at the edge of the mixing zone to temperatures greater than the following
monthly maximum temperatures:
(a)
For rivers, streams, and impoundments north of a line between Bay City,
Midland, Alma and North Muskegon:
J F M A M J J A S 0 N D
38 38 41
56 70 80 83 81
74 64 49 39
(b)
For rivers, streams, and impoundments south of a line between Bay City,
Midland, Alma, and North Muskegon, except the St. Joseph river:
J F M A M J J A S 0 N D
41 40 50
63 76 84 85 85
79 68 55 43
(c)
St. Joseph river:
J F M A M J J A S 0 N D
50 50 55
65 75 85 85 85
85 70 60 50
(4)
Non-trout rivers and streams that serve as principal migratory routes
for anadromous salmonids shall not receive a heat load during periods of
migration at such locations and in a manner which may adversely affect salmonid
migration or raise the receiving water temperature at the edge of the mixing
zone more than 5 degrees Fahrenheit above the existing natural water
temperature.
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service of the State Bar of Michigan Environmental Law Section. The administrative rules, which were
re-formatted for consistency, are not intended to replace official versions and
are subject to revision and/or repeal.
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