Olmsted County, MN Environmental Rules: Boat Dock Permits (2026)
Key Facts
- Governing section
- Ch. 1400 § 9.15(C)(3), Water-Oriented Accessory Structures
- Structures per lot
- One water-oriented accessory structure or facility
- Size limit
- 10 feet tall, 250 square feet maximum
- Setback
- At least 10 feet from ordinary high-water level
- Boat-storage exception
- Up to 400 sq ft, 20 ft wide max
- Permit needed
- Section 9.10 zoning permit for buildings, decks
Summary
Olmsted County's shoreland zoning code caps water-oriented accessory structures like docks, boathouses and watercraft storage buildings at one per residential lot, ten feet tall and 250 square feet, set back at least ten feet from the ordinary high-water level, and buildings or decks in shoreland need a Section 9.10 zoning permit before construction.
3. Water oriented accessory structures or facilities: Each residential lot may have one water oriented accessory structure or facility if it complies with the following provisions: a. The structure or facility must not exceed ten (10) feet in height, exclusive of safety rails, and cannot occupy an area greater than 250 square feet. The structure or facility may include detached decks not to exceed eight (8) feet above grade at any point or at-grade patios. b. The structure or facility is not in the Bluff Impact Zone. c. The setback of the structure or facility from the ordinary high-water level must be at least ten (10) feet. d. The structure is not a boathouse or boat storage structure as defined under Minnesota Statutes, Section 103G.245;
Full Breakdown
15(C)(3) of the Olmsted County Zoning Ordinance limits each residential lot in the Article IX Shoreland Overlay District to one water-oriented accessory structure or facility, covering docks, boathouses, watercraft-storage buildings and similar improvements near the water. The structure cannot exceed ten feet in height, excluding safety rails, and cannot occupy more than 250 square feet, though it may include a detached deck up to eight feet above grade or an at-grade patio. 245. The structure must be treated with vegetation, topography, added setback or color to cut its visibility from the water and neighboring shoreland under summer leaf-on conditions, its roof can be used as an open-air deck with safety rails but not an enclosed room or storage space, and it can never be used for human habitation or hold water supply or sewage treatment equipment.
On general development and recreational development waterbodies, a structure used solely to store watercraft and boating equipment may grow to 400 square feet if it is no wider than 20 feet measured along the shoreline. 15(C)(3) dimensional limits.
Violations & Fines
Building a water-oriented accessory structure larger than the Section 9.15(C)(3) limits, without the required setback, or without the Section 9.10 zoning permit is a misdemeanor under Sections 3.08 and 3.10 of the ordinance, with each day of the violation a separate offense. The Zoning Administrator can require removal or an after-the-fact permit, or seek an injunction.
Frequently Asked Questions
How big can my dock or boathouse be?
Do I need a permit to build a dock structure with a deck?
Can I build a boathouse for storing my boat?
Does this apply to docks in Rochester or the city of Oronoco?
Sources & Official References
Other rules in Olmsted County
Compare Olmsted County to another location·View the Minnesota environmental rules overview
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