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Big Hollow Lake Water Quality Improvement Plan available online

  • 3/18/2021 12:04:00 PM
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MEDIAPOLIS – Iowans interested in the results of a DNR study to improve water quality in Big Hollow Lake in Des Moines County can view a presentation on the Iowa DNR’s YouTube channel.

Big Hollow Lake is on the state’s list of impaired waters for high levels of algae and fluctuations in pH. The current study, or DNR water quality improvement plan, shows how these problems are caused by too much phosphorus in the lake. The problems impact recreation on the lake and aquatic life.

The plan explores the amounts and sources of phosphorus entering the lake and offers potential solutions to reduce those levels and work toward fixing the problem. The document is designed as a guide for local resource agencies, partners, stakeholders and residents to improve the lake. 

The presentation is available now at through April 19. The full document can be downloaded on the Iowa DNR’s website at the following:

Public comments on the plan must be submitted by April 19 to Jeff Berckes by E-mail at, or by mail to Jeff Berckes, Iowa DNR, Wallace State Office Building, 502 E. Ninth St. Des Moines, Iowa 50319.

After gathering Iowans’ comments, the DNR will forward the final plan, also called by its technical name of Total Maximum Daily Load (TMDL), to the U.S. Environmental Protection Agency for approval.