Big Cormorant's Waterline Has a Four-Year Memory

How low is Big Cormorant heading into freeze-up? On September 13, 2026, the lake read 1,353.21 feet above sea level. That's 16.68 inches below its Ordinary High Water Level of 1,354.60 feet, according to the Big Cormorant Lake Association's lake information page. The Minnesota DNR's own gauge for the lake also lists September 13 as its latest reading, at 1,353.2 feet.

A foot and a third under the mark matters more than it sounds. Becker County just had one of its wettest Septembers on record, and a big rain like that usually feels like it should fix things. But this low water has been building for four years, and one good month can't make up for it.

Eight Inches Gone Between Memorial Day and Mid-September

The association logs the level all season. Tim Krieg told members at the June meeting that volunteers check clarity and depth every month in Pikes Bay and on the main lake. This year's log shows a slow spring and a fast late summer.

On May 25 the lake was 8.4 inches below the high water mark. It barely moved through the Fourth of July: 8.76 inches below on June 21 and 8.28 inches below on July 4. Then it started to fall. It went to 9.24 inches below on July 20, 11.4 inches on July 26, 13.56 inches on August 7 and 15.96 inches on August 23. That's close to seven inches lost in about five weeks of high summer. A small bump to 15.48 inches below on September 4 didn't last, and September 13 brought the lowest reading of the year so far.

Every September Since 2018, Side by Side

On its own, a single reading doesn't say whether this fall is normal. The association keeps a year-by-year archive, and its mid-September readings make the comparison easy.

This year's May starting point of 8.4 inches below is almost exactly where the lake ended last summer, at 8.52 inches below in September 2025. So 2026 started where a normal year ends and kept dropping. By mid-September, 2026 sat just under 2018's mid-September figure. The only lower year in the table is 2021, the drought year, when the lake was more than two feet below the mark and slid to 29.52 inches below by November 4.

This is not a record. The DNR's gauge record goes back to 1953, and the lowest elevation it shows is 1,345.94 feet, recorded June 16 of that year, more than seven feet below this September's reading. But among recent falls, this one is clearly low.

Why One Wet September Doesn't Erase It

The DNR put a name to this pattern in an August 3, 2026 news release. Much of north-central Minnesota, it said, is in "storage drought." That means water stored in lakes, soil and groundwater has run down far enough that it typically takes years to recover. State Climatologist Luigi Romolo laid out the numbers in the same release:

"A few heavy rain events aren't enough to pull an area out of storage drought. Over the past four years, north-central Minnesota has received 12 to 16 inches below normal precipitation. So, it would take months of precipitation far above normal amounts to bring lake levels and soil moisture back to typical levels."

September brought some of that above-normal rain. Drought.gov's Becker County page ranks September 2026 as the county's 10th-wettest September in 132 years, at 2.09 inches above normal. Even so, January through September still came in 0.43 inches below normal, and the whole county remained in drought in the data valid October 13, 2026. Most of the county was rated moderate drought and a small share severe.

The September 13 lake reading was taken before most of that rain fell. Neither the association nor the DNR gauge has posted a newer number for Big Cormorant, so the next reading will be the first to show how much of September's rain actually reached the lake.

Clarity Is Still Within Recent Range

Clarity dropped over the same months, and the numbers can look alarming at first. The main-lake Secchi reading went from 40 feet on May 25 to 23 feet on September 13. Pikes Bay went from 38 feet to 17 feet.

Compared with earlier years, it's fine. In lakewide water-quality records for 2021 through 2025, each season's least-clear reading fell between 14.1 and 20 feet. A main-lake reading of 23 feet in mid-September is clearer than any of those. The Minnesota Pollution Control Agency's summary for Big Cormorant describes good clarity and low algae through the open-water season. Pikes Bay is measured at a different spot, so its 17 feet isn't directly comparable to the main lake.

The DNR's release also points out that low water isn't all bad for the lake. Low levels let lakebed sediment settle and firm up, and they can spur aquatic plants that shelter fish and insects and help reduce shoreline erosion. Part of the lakebed that's exposed right now is doing that work.

Where the Legal Shoreline Sits When the Water Doesn't

This is where a low year affects shoreline owners directly. The Ordinary High Water Level is the line the DNR regulates from, and it doesn't move when the lake drops. In the same release, the DNR noted that in low-water areas this line "could be considerably farther up the banks than the current water level." On Big Cormorant this fall, the gap between the two was 16.68 inches of elevation as of September 13.

Here's what the published rules and programs say:

• Work below the high water line. The DNR's permit guidance says filling, excavation and other work proposed below the Ordinary High Water Level may need a public waters work permit, and it recommends checking with the area hydrologist first.
• Low-water projects. DNR section manager Randall Doneen asked people in the August release to hold off on "manipulating lake level outlets or undertaking enhanced shoreline alterations during temporary low-level conditions."
• Watershed permits. Sam Blattenbauer reminded members at the association's June meeting that any work in the Cormorant Lakes Watershed District needs a permit. Permits are free, and the district has hired an inspector who photographs projects around the lake. On September 20, 2026, the district posted a notice directing shoreline owners to the DNR's updated riprap guidance.
• Paying for a buffer. At the June meeting, held at YMCA Camp Cormorant, Karl Koenig of Becker County Soil & Water described the agency's Shoreline Restoration program, which pays 75% of the cost of putting in a buffer zone. Tim Krieg added that the Big Cormorant Lake Area Foundation's grant program can cover the remaining cost so participating owners pay nothing out of pocket. The foundation had two applications in at the time, according to the June 2026 minutes.

This is general information, not legal advice. Before you dig, fill or armor anything on your frontage, confirm your project with the DNR area hydrologist and the watershed district.

Freeze-Up Dates to Plan Around

Boats still on lifts have a deadline, and the association's ice record gives a sense of when it usually arrives. Recent ice-in dates on Big Cormorant:

• 2025: December 5
• 2024: December 9
• 2023: January 2, 2024
• 2022: December 1
• 2021: December 7
• 2020: December 15
• 2019: November 25
• 2018: November 20

Two of the last eight years froze before Thanksgiving, and one stayed open into January. The lake has two public accesses, each with one trailer ramp. In its September 2026 newsletter, the Otter Tail County Coalition of Lake Associations passed along DNR advice that low water can make larger boats harder to launch and retrieve, and can expose stumps, rocks, holes and sandbars at the end of a ramp. The DNR says to check a specific access in LakeFinder or call the area office for current conditions. Ice went out this year on April 23, and the next level reading on the association's page will show whether September's rain got the lake any closer to where it started in May.

A low fall shows up later in ways people don't expect: a beach that looks bigger in listing photos, a dock that needs an extra section, a buffer planting that a buyer asks about next spring. If you're thinking about what this year's waterline means for your own frontage, or whether a shoreline project now would add value when it's time to sell, Monica Kaiser has spent more than 26 years reading Big Cormorant shorelines and would be glad to walk yours with you. Request your home valuation, and we'll start from where the water sits today.