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C-
My last few dives in the SW side of Lake Tahoe (heavy population area) had
vis ranges from 20' on one dive to 40' on the others. When I first started
diving there in the mid '80s vis was over 100' and the old timers said it
was nothing compared to what it used to be. The rocks were clean now they
have at least 1/2" or more of algae building up on them. 

When you go over to the sparsely populated East side it still has decent vis
but nothing like it was, you can really see the effects of population in
action. When you get around the resort areas its like diving a lousy pond.
Because of how the gunk is zoned out I have always speculated it was because
of fertilizers used by homeowners, parks & golf courses. Its interesting to
hear about this happening to other lakes.
Jeremy


>  Interestingly, I have watched a local impoundment (Lake Lanier) go from a
>beautiful lake with 30 foot visibility at the surface to a eutrophicated
>sewer in just 15 years of development primarily because of fertilizers used
>by homeowners around the lake.

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