Rochester Didn't Find Its Geese. It Built Them a Lake.

Walk the path around Silver Lake on a September morning and you will hear them before you see them: a low, constant honking that rises and falls as one flock lands and another lifts off toward the Zumbro. Longtime residents mostly stop noticing the sound after a while. Visitors stop and stare. Both groups tend to assume the same thing, that this is simply what happens when a lake sits in the middle of a Minnesota city and geese, being geese, found it.

That assumption is backwards. Rochester didn't inherit a wild goose population that happened to settle downtown. The city built the conditions that made this exact flock possible, on purpose in some cases and by accident in others, and it has spent the last two decades trying to undo what it built. Understanding that reversal changes how you see every goose on that lake.

A private flock, a warm lake, and a species that wasn't supposed to exist anymore

The story starts with one man's hobby. In the 1920s, Dr. Charles Mayo, one of the founding brothers of the clinic that carries his family's name, bought 15 Canada geese to keep on the roughly 3,000-acre game refuge surrounding his Mayowood estate. He was an avid conservationist who liked feeding them on his walks. The birds did what birds do, and the flock grew well past 15.

The real turning point came later, when a coal-fired power plant on Silver Lake began using the water as a cooling discharge point in the late 1940s. The warm water kept the lake from freezing, which meant geese that would normally fly south for winter simply stayed. By the early 1950s, more than 6,000 geese were living year-round on a lake half a mile from downtown, a number that kept climbing as word got around, so to speak, among migrating flocks looking for open water in the middle of a frozen state.

Here is the detail almost nobody outside wildlife biology circles knows. In 1962, researcher Harold Hanson of the Illinois Natural History Survey came to study the Rochester flock and made a discovery that mattered well beyond city limits. The birds on Silver Lake were giant Canada geese, a subspecies that had been presumed extinct for decades. Rochester's oddball population of overfed, overwintering birds turned out to be one of the last strongholds of a bird the scientific community had written off. That discovery helped kick off a national recovery effort that eventually rebuilt the giant Canada goose from a handful of remnant flocks into a common sight across the continent, as chronicled by Atlas Obscura in its history of the city's relationship with the birds.

The number that should stop you: nearly 40,000 geese, in a city of under 100,000 people

The flock kept growing for decades after that. By 2005, close to 40,000 giant Canada geese were living on and around Silver Lake, at a time when Rochester's entire human population sat below 100,000. Put another way, for every 2.5 people who lived in Rochester, there was a goose that also called it home, and unlike the humans, the geese weren't paying property taxes or picking up after themselves.

The city had a blunt way of explaining why that mattered. An adult goose drops two to three pounds of droppings a day. Multiply that across tens of thousands of birds concentrated around one small lake and you get trails that become unusable, picnic areas that become uninviting, and a stretch of the South Fork Zumbro River that the Minnesota Pollution Control Agency has classified as impaired for recreational use because of fecal coliform bacteria, according to the city's own accounting of the problem. The geese Rochester had spent 80 years cultivating had become, in sheer volume, a public works issue.

The undoing, one small step at a time

The reversal started quietly. A vegetation buffer went in along the Silver Lake shoreline in 2007, aimed partly at filtering runoff and partly at making the shoreline less inviting to nesting geese. The power plant that had kept the lake artificially warm for six decades shut down the following year, and Silver Lake began freezing over in winter again for the first time since the Truman administration. Corn feeders that had let visitors hand-feed the birds for generations came out of the park.

The flock thinned considerably. By 2013, a fall migration count put the population at 23,500, the lowest in decades, down from those mid-2000s peaks near 40,000. The state's own wildlife supervisor at the time noted that the year-round resident flock, the birds that never leave regardless of season, had settled into a range of roughly 1,000 to 2,000, a fraction of what Silver Lake once held.

That decline was mostly incidental, a side effect of closing a power plant for reasons that had nothing to do with wildlife management. What has happened since 2021 is intentional. The city adopted egg addling, a method that coats or oils eggs so they never hatch while the parent geese continue to incubate them undisturbed, which keeps adult geese from simply renesting elsewhere. It is not culling and it is not lethal. It is a slow, deliberate lowering of the birth rate.

The program runs every spring at four specific locations:

• Silver Lake
• Cascade Lake
• Soldiers Field
• Kutzky Park

The city resumed this year's round of egg addling at the end of March 2026, and Paul Widman, Rochester's director of Parks and Recreation, framed the ongoing effort in terms that sound almost like watershed management rather than pest control.

"These efforts are about long-term balance. The resident goose population has grown beyond what our parks can support. A consistent, non-lethal approach helps reduce impacts and create a more inviting park experience."

The city describes the technique as safe, effective, and conducted under state and federal permits, since Canada geese remain federally protected and any population management has to work within those rules rather than around them.

Not everyone wants a smaller flock

Here is where the story stops being tidy. Reporting from Minnesota Public Radio in May 2026 found real friction over the egg addling program, with some Rochester residents pushing back not because the method is inhumane but because they don't want fewer geese at all. For a segment of the city, the honking, the crowds of birds along the trail, and even the mess are simply part of what Rochester sounds and feels like. A hundred years of cultivating this flock, first by accident and then on purpose, built something that people now consider theirs, and asking them to accept a quieter, cleaner Silver Lake is asking them to give up a piece of the city's personality along with the droppings.

That tension is unlikely to resolve cleanly. The city has permits, a documented water quality problem, and a management plan it intends to keep running every spring. The residents who show up to public comment periods have a hundred years of civic memory and a fair point about what makes a place feel like home. Both things are true at once, which is usually how the most interesting local stories work.

What this actually tells you about the lake you walk past

The geese at Silver Lake were never a natural phenomenon that Rochester happened to host. They are the visible result of a private citizen's hobby, an industrial cooling system, a scientific rediscovery that mattered nationally, and now a fifteen-year municipal effort to walk the whole thing back to something closer to balance. If you have lived here long enough to remember when the flock felt endless, you were watching the tail end of an engineered peak. If you moved here more recently and think of the geese as a modest, occasional nuisance, you are seeing the result of a management program that has been quietly working since before most people paid attention to it.

The lake itself is still one of the better reasons to live near downtown, whether you are watching the Rochester Rowing Club practice at dawn or picking up the paved loop that connects Silver Lake to the wider trail network stretching out toward Quarry Hill and Mayowood. Knowing why the birds are there, and why the city keeps trying to have fewer of them, just adds a layer to a walk you were already going to take.

If you are the kind of person who wants to understand a place at this level of detail before deciding where to put down roots in it, that instinct tends to serve buyers and sellers well too. Michelle Kalina and her team bring that same attention to the neighborhoods behind the listings, from downtown Rochester's established blocks to the acreage on its edges. If Silver Lake's history has you curious about the neighborhoods around it, you can request a private White Glove consultation whenever you're ready to talk specifics.