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Estimating depth of outside weed edge

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Does anyone have a general rule of thumb for estimating how deep the grass will be in natural northern lakes? Would be good to know when looking over a map prior to fishing. 

 

I know it can vary, but also know that light penetration plays the biggest role, would be nice if there was a formula like 1.5 times water clarity is deepest weeds will grow.

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In the Northern lakes I fish, Michigan, Wisconsin it depends on a few things.  First and formost, the type of "weed" or grass that is growing.  Cabbage, milfoil, sand grass, eel grass, and a few more species all exist at different depths from 15 feet to 2 feet.  The only way to know for sure is to get out and graph it or throw a bottom dragging bait and see what you pull up.  

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There are some nice studies out there on this subject showing good correlation between light penetration and maximum growing depth of vegetation. While there will always be one-off examples and outliers, the studies generally show that submerged vegetation requires a minimum of 10% incident light for growth. Using Secchi Depth transparency, about 90% of the time the max depth of growth will be 3X water clarity, with around 60% of that falling within 2X water clarity.

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... and water clarity can change significantly throughout the year, so using clarity as a gauge can be "murky" at best.

 

oe

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