Those concerned about the possible plans for a future improvement project to South Twin Lake in rural Calhoun County were brought up to speed Tuesday night on the Iowa Department of Natural Resources’ vision for the lake.
The Rockwell City Community Center was filled to standing room only during the public meeting. More than 100 people came to voice their concerns and hear what the DNR has in store. At the meeting, DNR officials informed residents of the Rockwell City and Twin Lakes area of the process involved in lake restoration, while clarifying rumors of South Twin’s future.
“We have no definite plans at this time,” said Jim Wahl, regional fishery supervisor with the DNR. “The idea now is just to share information. The DNR feels that South Twin Lake is not living up to its full potential.”
Mike McGhee, Iowa lakes program manager for the DNR, said there are currently 131 lakes within the state that are considered prioritized lakes. These lakes are observed for their water quality, public benefit and feasibility of restoration.
“With this project, we would like to see water clarity of 4 to 5 feet during the months of April through September, keep beaches to recreational standards and create and maintain a healthy aquatic environment,” said McGhee when explaining what the potential outcomes of the shallow lake improvement project would be.
Doug Janke, DNR shallow lakes project manager, said South Twin Lake would benefit from the improvement project because recent tests indicate that its water clarity is only about 6 inches.
“The goal is to improve water quality in the lakes,” he said. “But first you must improve the clarity.”
Janke also informed those in attendance that another project goal is to improve the plant population within the lake. More plant growth would likely require the lake to be drained and dried to rid the lake of unfavorable fish, such as carp. This would allow sediment to settle to the bottom and create a mud flat in which new plants can grow.
Currently, there are only five known species of plant life in South Twin Lake. An improvement project to Diamond Lake in northwest Iowa, similar to that proposed for South Twin, resulted in an increase from three known plant species to 24.
“Vegetation is an important part of this project,” said Lannie Miller, a DNR fishery biologist.
One rumor Janke and Mike Mahn, a DNR wildlife biologist clarified is that the project doesn’t mean the lake would not be permanently lowered.
“This is an issue that has been met with a lot of controversy,” said Mahn. “We will need to drain the lake, but it’s still too early to discuss any specifics on how it would be done.”
While DNR officials feel Twin Lakes would benefit from the project, some Twin Lakes residents, such as Dave and Mary Gidel, feel the lake should simply be dredged and be given more access points. They believe the lake is good as it is for sailing, wakeboarding and fishing, but its boat ramp, which lacks a dock, keeps it underutilized.