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Contact(s): Marcia Willhite, DNR Water Evaluation Section Chief, 608-267-7425
August 6, 2019

Buckhorn State Park is located on the Castle Rock Flowage, one of three flowages on the Wisconsin River that would have  - Photo credit: DNR
Buckhorn State Park is located on the Castle Rock Flowage, one of three flowages on the Wisconsin River that would have site-specific water quality standards for phosphorus under a proposal that is the topic of an upcoming public hearing.Photo credit: DNR

MADISON - The public will have an opportunity to learn more about and comment on a proposed rule to create site-specific water quality standards for phosphorus on three reservoirs in the Wisconsin River Basin at a public hearing on August 13 in Wisconsin Rapids with simulcasts in Rhinelander and Portage.

The Wisconsin Department of Natural Resources is proposing the site-specific criteria for Petenwell Lake, Castle Rock Lake and Lake Wisconsin.

The DNR uses a process called Total Maximum Daily Load to develop a pollution "budget" for a water body that establishes reductions needed to meet water quality goals, according to Marcia Willhite, DNR Water Evaluation Section Chief.

The TMDL for the Wisconsin River Basin, in which the three water bodies are located, requires substantial reductions in phosphorus. While phosphorus is too high in all three lakes and needs to be reduced, the current broadly established criteria are not appropriate for all three.

"Because the water in Castle Rock and Petenwell lakes produces less algae per unit of phosphorus than other lakes of their type, the standard for phosphorus doesn't need to be set as low to get rid of the algae," Willhite said. "The situation in Lake Wisconsin is the opposite. This lake typically meets its current phosphorus standard, but still has too much algae, so a more stringent phosphorus standard and a bigger reduction in phosphorus is needed for Lake Wisconsin to make it healthy for recreation."

Willhite said some people may think that this rule allows more phosphorus to accumulate in lakes that already have algae problems, "but that is not the case - it needs to be reduced in all three lakes, just not as much in Castle Rock and Petenwell as it does in Lake Wisconsin."

Public participation is a critical component of agency rule making. The proposed language is available by searching the DNR website,, for "proposed permanent rules" under Board Order WY-09-18.

The public hearing will be held at 1:30 p.m. on August 13 at the Wood County Land & Water Conservation Dept., River Block, 111 W. Jackson St., Wisconsin Rapids. To allow greater participation, the hearing will be simulcast to the Rhinelander DNR Service Center, 107 Sutliff Ave., and to the Columbia County Health and Human Services, 111 E. Mullett St. in Portage.

Written comments may be submitted at the public hearings or to Marcia Willhite by email at,, by U.S. mail to Wisconsin DNR, PO Box 7921, Madison, WI 53707-7921, or calling 608-267-7425. The deadline for comments is August 20, 2019.

Last Revised: Tuesday, August 06, 2019

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