Protecting the natural beauty and water quality of the Brainerd Lakes and Alexandria area is a shared responsibility between homeowners and the Minnesota Department of Natural Resources (DNR). Central to these protections are the concepts of the Ordinary High Water Level (OHWL) and Shore Impact Zones (SIZ). Navigating these regulations is essential for any lakeshore project, as non-compliance can lead to hefty fines, required restoration, or the denial of future permits.
The DNR establishes the baseline standards, but these are typically administered and enforced by local county offices (Crow Wing or Douglas). The goal is to minimize runoff, prevent erosion, and preserve the “treeline” aesthetic from the water. Understanding where your property lines end and the “protected” shoreline begins is the first step in any responsible remodel or new build.
- OHWL (Ordinary High Water Level): The elevation delineating the highest water level maintained for a sufficient period to leave evidence on the landscape. All setbacks are measured from this line.
- Shore Impact Zone (SIZ): Land located between the OHWL and a line at half the distance of the required structure setback (e.g., if the setback is 75 feet, the SIZ is the first 37.5 feet).
- Bluff Impact Zone (BIZ): A bluff and the land within 20 feet of the top of the bluff. This area is extremely sensitive to erosion.
The Shoreland Regulatory Framework
Minnesota classifies lakes into three categories, each with varying levels of protection and setback requirements.
| Lake Classification | Typical Structure Setback | Shore Impact Zone (SIZ) |
| General Development (GD) | 75 Feet | 37.5 Feet |
| Recreational Development (RD) | 100 Feet | 50 Feet |
| Natural Environment (NE) | 150 Feet | 75 Feet |
Note: These distances may decrease if the property is sewered. Always verify with your local County Land and Resource Management office.
Vegetation Management
The DNR prohibits “intensive” clearing in the Shore and Bluff Impact Zones. To maintain a natural buffer that filters runoff, homeowners are generally limited to what is known as Limited Clearing.
- View Corridors: You are typically allowed to clear or prune trees and shrubs to create a “view corridor” to the lake. This is often limited to a maximum of 25% of your shoreline frontage or a specific width (e.g., 25 feet), whichever is less.
- Screening: You must leave enough vegetation to ensure that structures and vehicles remain largely screened from the view of those on the water.
- Disease & Safety: Removal of dead, diseased, or hazardous trees is generally permitted but often requires a local “Shoreland Alteration Permit” to ensure a restoration plan is in place.
Engineering Shoreline Access
Because foot traffic on steep slopes leads to soil compaction and erosion, the DNR and Counties have strict standards for how you access your dock.
- Stairway Width: Residential stairways must be no wider than 4 feet.
- Landings: To prevent large platforms near the water, landings are capped at 32 square feet and cannot have roofs or canopies.
- Construction Style: Stairways should be built on posts or pilings rather than being dug into the bank. This “at-grade” approach allows water to flow underneath and prevents the staircase from becoming a channel for erosion.
Frequently Asked Questions (FAQ)
How close can my deck really be to the lake in Crow Wing or Douglas County?
Decks are considered structures and must typically follow the same setback as the house (e.g., 75 feet on a General Development lake). In some specific cases, a deck may encroach slightly into the setback if it is unroofed and meets local “performance standards,” but it can never enter the Shore Impact Zone.
Can I remove trees in the Shore Impact Zone if they block my view of the lake?
Yes, but only through “Limited Clearing.” You can prune branches or remove a select number of trees to create a viewing corridor, provided the house remains mostly screened from the lake. “Clear-cutting” or removing the majority of the canopy in the SIZ is strictly prohibited and carries significant penalties.
What defines “Limited Clearing” (the 25% rule) for shoreline vegetation?
“Limited Clearing” allows for the removal of trees and shrubs within a specific width of your lot—usually 25% of the total frontage or 25 feet, whichever is less. The goal is to allow a view and a path to the water while maintaining 75% of the shoreline in its natural, vegetative state to filter runoff.
Do I need a DNR permit to replace an existing dock landing or staircase?
While you generally do not need a DNR permit for a standard temporary dock, you do need a local Shoreland Alteration Permit from your county (Douglas or Crow Wing) to replace a permanent staircase or landing. The county will ensure the new structure meets modern width and material standards to prevent erosion.
What is the “bluff impact zone” and why are building restrictions so strict there?
A Bluff Impact Zone includes the bluff face and the land 20 feet back from the top. Restrictions are strict because bluffs are geologically unstable; adding weight (structures) or removing deep-rooted vegetation can trigger a “slope failure” or landslide, endangering your home and the lake’s ecosystem.
What happens if I work without a permit in the Shore Impact Zone?
Unpermitted work in the SIZ is a violation of the local Land Use Ordinance. Counties can issue “Stop Work” orders, impose daily fines, and—most importantly—require you to hire a professional to restore the shoreline to its original, natural state at your own expense.
Navigating shoreland rules is about protecting the legacy of Minnesota’s lakes. At Wensmann Contractors, we act as your liaison between your vision and the regulatory requirements of the DNR and local counties. We specialize in “compliance-first” design, ensuring your project is beautiful, legal, and environmentally sound for generations to come.
By: Wensmann Contractors Team Last Updated: March 10, 2026
Greg Wensmann, 2021 CMBA Builder of the Year, specializes in DNR-compliant lake home construction and shoreline restoration throughout Central Minnesota.