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 Lake Grades

 

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Data Info

Secchi Depth
Trophic State Index
Lake Grades
Chlorophyll
Nutrients

GIS

Aquatic Plant Surveys

 

 

Does your lake get a passing grade?
A grading system for water quality has been developed using surface total phosphorus, chlorophyll, and secchi depth data by Dick Osgood (and subsequently modified by John Barten). The criteria are shown in the table below.

Grade
Percentile
TP
(ug/L)
>90
< 23
< 10
> 3
70 to 90
23 to 32
10 to 20
2.2 to 3
30 to 70
32 to 68
20 to 48
1.2 to 2.2
10 to 30
68 to 152
48 to 77
0.7 to 1.2
<10
>152
>77
< 0.7

> means greater than
< means less than

 

 

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