GRAND LAKE - Heavy rains in late winter and early spring have further degraded Grand Lake's water quality and prompted state officials to scale back the upcoming alum treatment.
Instead of using a low dose of alum sulfate across the entire 13,500-acre lake, a more concentrated treatment will focus on only 4,900 acres in the center of the lake. This area has the highest level of phosphorus, which has been washed off the mostly agricultural land surrounding the lake and into its water. [
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