Two Chisago County lakes removed from Minnesota’s impaired waters list

With North Center and South Center lakes delisted, Chisago SWCD and NRCS staff continue to work with landowners and community partners to advance positive water quality trends emerging throughout the 20-lake chain just north of the metro


Nancy Moe-Mergens and Mike Mergens worked with Chisago SWCD on a lakeshore restoration that replaced invasive grass with native plants. They never intended to have a beach on their North Center Lake property, but Nancy said it’s possible for landowners to incorporate a bit of beach in a restoration. Ten years worth of rural and urban conservation projects are paying off in the 20-lake Chisago Lakes Chain of Lakes. Photo Credit: Nancy Moe-Mergens

CHISAGO COUNTY — When the Minnesota Pollution Control Agency removed North Center and South Center lakes from the impaired waters list this spring, Chisago Soil & Water Conservation District staff celebrated a continuation — not a conclusion — of targeted watershed work.

North Center and South Center were two of nine lakes in the 20-lake chain added to the impaired waters list in 2008. Removal requires meeting water quality standards for five consecutive years.

In Chisago County, the accomplishment reflects hundreds of conservation practices implemented over 10-plus years, stretching from lakeshore lawns to farm fields. Landowners’ work with the SWCD and its partners has led to improving water quality trends throughout the Chisago Lakes Chain of Lakes.

“All the other lakes where we have water quality trend data are also improving. That’s exciting. It’s not just one or two lakes,” said Jerry Spetzman, Chisago Lakes Lake Improvement District (LID) administrator. “A lot of the projects happening on North and South Center are also happening on the entire chain of lakes.”

Jerry Spetzman, Chisago Lakes LID administrator.

Phosphorus and chlorophyll-a levels are generally decreasing throughout the chain. Phosphorus feeds the algae that can turn lakes green. Chlorophyll-a indicates the presence of algae. Secchi disk readings, a measure of water clarity, are generally improving.

A targeted watershed demonstration grant from the Minnesota Board of Water and Soil Resources brought five years of dedicated Clean Water Funds to the Chisago Lakes Chain of Lakes starting in 2015. Work accomplished through that grant reduced phosphorus by an estimated 690 pounds a year. One pound of phosphorus can create 500 pounds of algae.

The SWCD has leveraged more than $1.7 million in Clean Water Funds, including the targeted watershed demonstration program grant, to gain additional dollars for conservation projects affecting the chain of lakes. It secured a Mississippi River Basin Initiative award — dedicated funding from the USDA’s Natural Resources Conservation Service that provided about $125,000 in assistance. The LID has contributed $40,000 annually. The St. Croix River Association contributed $50,000 total. Water quality work gained enthusiastic support from the cities of Lindstrom and Center City.

By the time it wrapped up in 2020, the targeted watershed grant had funded projects involving 43 landowners. Leveraged local, state and federal funds can cover up to 100% of costs. In exchange, landowners agree to a 10-year contract to maintain the practice.

SWCD and NRCS staff have continued the watershed-based approach. It starts by identifying pollution hotspots, and then working with willing landowners to implement conservation practices. From earthen structures that curb field erosion to rain gardens that filter runoff, conservation practices implemented throughout the chain of lakes ultimately benefit the St. Croix River downstream.

“It’s like a watershed success story. It’s great for North and South Center, but it’s also great for the entire watershed,” Spetzman said.

Chisago SWCD Administrator Craig Mell handles the contracts. SWCD water resources specialist Casey Thiel summarizes data collected though the LID’s water quality monitoring program, and works with urban and lakeshore property owners. SWCD resource conservationist Shane Hultman works with agricultural producers. Throughout the watershed, they’ve become recognized as a resource.

“We’re being seen more — and differently than the people who help farmers. Going back 10 years, that’s what the SWCD was. There wasn’t a direct connection to lake water quality,” Thiel said.

Chisago Lake Lutheran Church and the Center City water tower reflect in North Center Lake. The conservation projects and practices put in place by both urban and rural residents have resulted in improved water quality throughout the Chisago Lakes Chain of Lakes. Photo Credit: Joleen Rein

The SWCD has applied the targeted approach throughout the county. Staff is assigned to designated watersheds.

“This is the way that we do business. We use that model and it works. We prove every day that it works. From the assessments to applying for the grants to following up with monitoring to doing more assessments — that whole process. It works,” Thiel said.

Mell said it can take years to get a commitment from an ag producer. “They need to see it working elsewhere. They need to hear from their farming peers that it works,” Mell said.

Dedicated funding makes it easier to align projects with producers once they’re ready to proceed.

Spetzman summarized the Chisago Lakes Chain of Lakes effort:

“It’s all of us. It’s everyone who lives in the watershed, even people who don’t live on (one of the 20 lakes). … It’s all of us together.”

“It was a fabulous program,” Chisago County farmer Pat Eichten said of working with Chisago SWCD and NRCS to install erosion control projects including this grassed waterway, seen in summer 2020. The project drew from targeted Mississippi River Basin Initiative funding, state and local dollars. Photo Credit: Chisago SWCD


Pat Eichten’s first experience working with NRCS and the SWCD on a conservation project “eliminated the problem instantly,” he said, and worked so well that he pursued two more projects on rented land.

Targeted MRBI funding, combined with local and state dollars, reimbursed all three 100%.

Together, Eichten and SWCD staff identified resource concerns.

The first project — a water and sediment control basin (WASCOB) and a grassed waterway — diverted runoff from the steel roofs of a dairy barn and two pole sheds, and eliminated a 7-foot gully that split his Franconia Township field. Subsequent work installed grassed waterways and culverts. All three projects slow runoff and allow sediment and the pollutants it carries to settle out.

Together, the three projects cost about $40,000.

“I don’t know if we would have pursued it without the funding. Even with a 50% cost-share you would have tried to maybe plant the field differently, or implement your own grass runways,” Eichten said. “We probably wouldn’t have done it at all. It’s a great service if you can get this done without bankrupting the farmers at the same time.”

Eichten started farming full time after high school. He took over from his parents in 1993, and in 2003 got out of dairy and took an off-farm job as a rural mail carrier. He raises corn, soybeans and some hay on 250 to 300 acres. Eichten said he wanted to keep the land in ag production — or at least in family ownership and untouched by developers — for as long as possible.

Helping farmers continue to farm, and farm successfully, is Hultman’s big-picture goal for the county.

The WASCOBs are the most popular, easiest and fastest-acting of the erosion control options available to farmers through the MRBI.

“They work extremely well,” said Hultman, who surveys and designs projects.

Eichten said he doesn’t worry about gully-washers anymore. The WASCOB has filled with water 5 feet deep and drained by the end of the day without damaging the field.

“I always tell them the programs are there; it never hurts to ask,” Eichten said, describing how he told other farmers about the SWCD. “I try to push it because I know it’s a great program.”

With MRBI dedicated funding, the possibility that landowners would receive NRCS Environmental Quality Incentives Program (EQIP) funding for projects within targeted watersheds was nearly certain. A WASCOB project might lead a farmer to consider other practices such as cover crops or no-till.

“We get the field repaired for them first,” Hultman said. “You start with the problem, the resource concern, then you move into … getting them into the soil health movement.”

The cover crop Byron Dahlheimer planted in his Chisago County field was greening up by mid-April. Last fall he rented a no-till drill from Chisago SWCD, which had funding available to offset part of the seed cost. This view depicts a water and sediment control basin, which was installed previously with Clean Water Fund and Mississippi River Basin Initiative assistance. Photo Credit: Chisago SWCD


Byron Dahlheimer is trying cover crops for the first time.

With a rented no-till drill from Chisago SWCD, last fall he seeded a rye cover crop into 40 acres of harvested soybean fields. The 200-acre corn and soybean farm he runs with his brother and two sons lies across the road from North Center Lake. Dahlheimer previously installed two water and sediment control basins with Clean Water Fund and MRBI assistance.

Chisago SWCD funding will reimburse part of his cover crop seed cost. He described how he would determine success:

“First if it helps the soil, and then return on investment — if it’s going to pay off to do it. That may take a while to find out. That may take several years.”

Dahlheimer said he had been thinking of trying cover crops on his lighter soils — something he’d seen work well in states farther south — when a neighbor mentioned the signup available through the Chisago SWCD.

“I was looking for a way to help the soil a little bit, put some green down,” Dahlheimer said.

If cover crops work for the operation, he plans to buy his own drill. This spring, he’ll plant no-till corn into the 40 acres, which he described as gently rolling.

“Because of our proximity to the lakes, all the land we farm drains right into the lake system,” Dahlheimer said. “So we try to be careful what we do, or try to make it better.”

Like Dahlheimer, many landowners start with a WASCOB. Once the initial problem is fixed and they become familiar with staff, they may consider trying something new.

“The greatest asset is when you have somebody that’s really happy about a project and they tell everybody else about it,” Hultman said.

The rain garden installed on a strip of Aaron Hanson’s Lindstrom yard slows runoff from three-quarters of the city block. He’ll maintain the rain garden and pollinator habitat, which a contractor installed in 2019. Photo Credit: Aaron Hanson


Aaron Hanson spent part of his childhood on North Center Lake. He moved back to the area three years ago. In one season, he accomplished what likely would have taken years to install — a rain garden and pollinator habitat on a 10-by-40-foot strip of his Lindstrom yard.

Runoff from nearly three-quarters of the city block flows to a stormwater drain on that property. An alley separates the site from lakeshore lots on South Lindstrom Lake.

His job as an energy program specialist with the University of Minnesota’s Institute for the Environment acquainted Hanson with the benefits of pollinator-friendly habitat. He knew he wanted to plant native species to attract pollinators. Until he walked the property with Thiel, he hadn’t considered a rain garden.

“If I was left to my own devices, I would not have been able to do the rain garden part of it. I would have slowly but surely converted the grass into pollinator habitat,” Hanson said. The project was reimbursed 100% by Clean Water Funds and LID funds. “The Clean Water Funds allowed me to do all of the things all at once. Of course, it’s something I would have wanted to do, but that’s an investment in my property that would not have taken priority.”

A contractor installed the 8-by-30-foot rain garden two years ago. It fills when it rains, and then slowly drains. The flower species chosen provide spring-through-fall nectar sources.

“I think a lot of these environmentally friendly technologies can also be beautiful,” Hanson said, adding that inspiring others to consider planting pollinator habitat was one motivation to maintain the strip.

“(The SWCD) made it really easy and fun to contribute to a healthier lake,” Hanson said.

An angler fishes on North Center Lake. North Center and South Center lakes have been removed from the state’s impaired waters list. Photo Credit: Joleen Rein

Monitoring Details

MEETING STANDARDS: Minnesota has a two-part water-quality standard for eutrophication, which describes the effect of nutrients. Phosphorus levels must be at or below a certain level. Additionally, either Secchi disk readings, which measure clarity, or chlorophyll-a readings must meet the standard.

From 2013 through 2019, phosphorus levels and Secchi disk readings in North Center and South Center lakes consistently met water quality standards for aquatic recreation. Chlorophyll-a conditions have improved but did not meet the standard.

ACCEPTABLE LEVELS: For 889-acre South Center Lake to meet water-quality standards that support aquatic recreation, the average levels of total phosphorus must be below 40 micrograms per liter and Secchi disk readings must be at least 1.4 meters. For 754-acre North Center Lake, the average total phosphorus levels must be below 60 micrograms per liter, Secchi disk readings at least 1 meter. The standards differ because South Center Lake is classified as a deep lake, North Center Lake a shallow lake.

In Lindstrom, new or rebuilt city streets are made narrower when possible to reduces stormwater runoff and cut city maintenance costs. Where it dead-ends at South Lindstrom Lake, Linden Street was made narrower. It’s flanked by a stormwater treatment system that includes rain gardens. Photo Credit: Ann Wessel, BWSR

SWCD’s Expanding Role

ST. CROIX RIVER-RELATED: Since 2015, the Chisago SWCD has received $925,500 in Clean Water Fund grants related to curbing St. Croix River gully erosion via targeted, prioritized erosion control projects along the river and its tributaries.

ONE WATERSHED, ONE PLAN: Chisago SWCD staff will serve as the fiscal agent for the Lower St. Croix River One Watershed, One Plan, which received $1.62 million in dedicated Clean Water Funds from BWSR. Implementation will begin in 2021. Fifteen local government partners developed the plan, which prioritized conservation efforts for the next 10 years.

MAINTENANCE: Seasonal employees hired through an SWCD partnership with the LID maintain projects on public property. They weed, remove sediment and monitor publicly owned water quality projects for needed repairs. Those projects include vegetated swales, rain gardens, lakeshore buffers and stormwater pond enhancements. Urban projects are inspected every year; ag projects every two years.

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NRCS Dedicated Funds

MRBI: An initiative of the USDA’s Natural Resources Conservation Service, the Mississippi River Basin Initiative centers on practices that improve water quality, restore wetlands, enhance wildlife habitat and sustain agricultural profitability in the Mississippi River basin. Water quality concerns, mostly related to nutrient-loading, prompted NRCS to make the Mississippi River a priority. “The big goal is to try to limit the hypoxic zone in the Gulf of Mexico. They’re starting at the top of the watershed and working their way down,” Hultman said.

SECOND MRBI AWARD: The Chisago SWCD in 2021 received a $425,000 MRBI award, which brought dedicated funding to the Goose Creek Watershed. The watershed includes Goose Lake, Rush Lake and Rush Creek. It drains to the St. Croix River, a Mississippi River tributary.

The Minnesota Board of Water and Soil Resources’ mission is to improve and protect Minnesota’s water and soil resources by working in partnership with local organizations and private landowners.



Minnesota Board of Water and Soil Resources

Our mission is to improve and protect Minnesota’s water and soil resources by working in partnership with local organizations and private landowners.