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Nutrient and Algal Criteria for Trophic
Classification of Colville Reservation Lakes
The table below gives the nutrient and algal
criteria for classifying lakes on the basis of
lake productivity. The values range from those of
low productivity Lakes (Oligotrophic) to high
productivity lakes (Eutrophic) with values in
between indicating more or less average
productivity lakes (Mesotrophic).
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Productivity Criteria
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Oligotrophic
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Mesotrophic
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Eutrophic
|
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Total N micro g/L at spring overturn
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<100
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100-500
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500-1000
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Total P, micro g/L at spring overturn
|
0-2
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2-7
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>7
|
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Chlorophyll a, micro g/L growing season
mean
|
0-2
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2-7
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>7
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Secchi disc (m), growing season mean
|
6
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3-6
|
<3
|
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Hypolimnetic oxygen depletion rate
mgOxygen/square m/day
|
<250
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N/A
|
>500
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