Enhanced Wake Area

Wake surfing is a genuinely fun sport, and the people doing it here are our neighbors. This is an attempt to explain one thing clearly: a wake boat is engineered to do something ordinary boats are engineered to avoid — create the largest possible wave. That design goal has physical consequences that reach farther, and deeper, than most people expect. Those consequences depend heavily on how big and how deep a lake is.

Our chain is small and, in two of three cases, shallow. Here's what that means:

— 500 Ft from Shore and 20 ft Depth —

The Effects
 

CLICK FOR FULL SCREEN DISPLAY

 

A wakesurf boat is engineered to do something ordinary boats are engineered to avoid: create the largest possible wave. That design goal has physical consequences that reach farther, and deeper, than most people expect — and how much they matter depends almost entirely on how big and how deep a lake is.

It's not just a bigger boat

Three systems work together to build the wave:

01

Ballast tanks

Take on hundreds to thousands of pounds of lake water, pushing the hull deeper into the water.

02

Bow-high trim

Holds the boat plowing at 10–12 mph — too fast for no-wake, too slow to climb onto plane.

03

Surf systems

Plates, tabs, and hydrofoils shape the wake into a rideable face on one side of the boat.

This is the boat working exactly as designed. Nothing about it implies a careless operator.

What researchers measured

3–12× the wave energy of a comparable ski boat

In field measurements, wakesurf boats produced the largest waves of any boat tested — in height, in total energy, and in power.

500 ft to fade to a normal boat's wake

Bigger waves need more distance to spend their energy. Wisconsin's shoreline rule is 100 feet, written before these boats existed.

20 ft minimum depth for surfing

Enhanced-wake operation drives turbulence downward, not just outward — double the 10 feet recommended for ordinary cruising.

Why depth matters here

Turbulence reaches the lakebed Sediment is resuspended Phosphorus is released Algae growth

Lakebed sediment holds decades of accumulated phosphorus. Stirring it back into the water column feeds algae — the same nutrient problem that shoreline buffers, septic upgrades, and years of water-quality work have been slowly reducing. Church Pine's clarity in particular is a function of sediment staying put in its deep trench.

Now apply that to our chain

Most of the wake boat debate is really a debate about geometry. The findings are about distance and depth, so the size and shape of a given lake decides whether they're easy or impossible to satisfy. On our chain, depth is largely fine. Room is the problem.

Church Pine

87 acres · 45 ft max · 23 ft mean

Has the depth, not the room. A 45-foot glacial trench, but only about a quarter mile across — so a 500-foot buffer off each shore leaves a sliver roughly 300 feet wide.

Round (Wind)

39 acres · 22 ft max

Has the depth, not the room. Deep enough in places, but at 39 acres it's far too small for a 500-foot buffer of any kind — and the island adds shoreline in the middle of the lake.

Big

245 acres · 24 ft max · 17 ft mean

Has the room, not the depth. The only one of the three with open water for a real shoreline buffer, but a 17-foot mean depth falls short of the surfing threshold.

The pattern is worth sitting with. A 500-foot buffer needs clearance on both sides at once, so a lake has to exceed 1,000 feet in width before any of its water qualifies. Church Pine and Round are simply too narrow. Big Lake is the only one of the three where that distance exists — which is why the District's suggested enhanced wake area is there.

What actually helps

  • Go deep. Depth is the single highest-leverage choice an operator controls. Use the District's suggested enhanced wake area on Big Lake.
  • Go wide. Far more room than the 100-foot legal minimum.
  • Move your line. Repeated passes concentrate all that energy on one stretch of bank.
  • Drop ballast on the way in. Out of surf mode, the boat isn't loading the water the same way.
  • Drain your tanks. State law — and our three lakes share water, so anything introduced at one landing reaches all three.
  • Your wake is yours. Under Wisconsin law, wake damage is treated like collision damage.

Nothing on this page is a rule. The District has adopted a recommendation, not an ordinance. It works on good faith, the way most stewardship on a small chain of lakes does. Every figure is sourced under Data & Studies.

 
Working Solutions

If you own a wake boat on this chain, you've probably read the last tab with some frustration. Our lakes are small. No amount of good intention changes their dimensions.

But these lakes can't support enhanced-wake surfing is not the same statement as your boat doesn't belong here. Those two get collapsed together constantly in this debate, and they shouldn't be.

Your boat without ballast is just a boat

Empty the tanks, stay off surf mode, and your boat is an ordinary inboard. Cruise it, pull a tube, pull a skier, take the family out at sunset. The research supports this distinction directly rather than as a courtesy — the University of Minnesota tested wake boats in both modes and issued different recommendations for each:

Any powerboat, cruising or planing 10 ft or greater
Wake boats, while surfing 20 ft or greater

Note what that means here. Big Lake's mean depth is 17 feet and Church Pine's is 23. Out of surf mode, your boat comfortably satisfies the researchers' own recommendation across our chain. The constraint that makes surfing difficult here is room, not depth — and room isn't a factor at all for ordinary operation.

This isn't a distinction we invented. Vermont — which has the most restrictive wake sports rules in the country — treats an unballasted wake boat as an ordinary boat: if the ballast isn't filled, only the standard 200-foot shoreline offset applies rather than the 500-foot wakesports requirement. Wisconsin town ordinances have generally been written the same way, restricting full ballast rather than the boats themselves. So when you see "wake boat ordinance" in a headline, it usually means no enhanced wakes — not no wake boats.

Two honest caveats: a V-drive inboard still pushes real thrust downward, so shallow bays deserve care from any boat. And an "empty" ballast tank generally isn't dry.

Ballast tanks and invasive species

This is where wake boat owners can do something nobody else on the lake can, because nobody else has ballast tanks.

Our three lakes are one connected system. Church Pine flows into Round, Round into Big, Big out to Horse Creek. Anything introduced at one landing reaches all three. There is no containing an introduction to one basin and no undoing one.

Draining is required by law and it is not sufficient. Ballast systems on many wake boats aren't engineered to fully drain — roughly five gallons commonly remains. That residual water is exactly where the organisms that matter live: zebra mussel veligers, spiny water flea, starry stonewort fragments. All microscopic or nearly so, all invisible in a bilge. If your boat has only ever been on this chain, this is a non-issue. If you trailer between lakes, it matters a great deal.

What Wisconsin law requires before leaving any landing

  • Inspect the boat, trailer, and equipment
  • Remove all mud, plants, and attached animals
  • Drain all water — motor, livewell, bilge, and ballast tanks — plugs out
  • Dispose of unwanted bait in the trash
  • Never move live fish away from a waterbody

What actually decontaminates a ballast system

Draining is the legal floor. This is the effective version, per WI DNR guidance:

  1. Drain on an incline. Positioning the boat on a slope removes substantially more than draining on the flat.
  2. Pull the bags if you can. On boats with accessible soft ballast bags, remove and drain them directly — the most complete option available to an owner.
  3. Hot water flush. Low-flow hot water at 120°F, run into and out of the ballast system for 3–5 minutes, or per your owner's manual. This is the step that kills what draining leaves behind.
  4. Rinse the exterior with high-pressure hot water at 140°F.
  5. Rinse interior components with low-pressure hot water at 120°F.
  6. Dry, if you have time. Slower than a flush, and free.
  7. Skip the chemicals. DNR advises against chemical decontamination — equipment damage risk plus the discharge problem.

Free tip: if you're hitting several lakes, do the clean ones first and known-infested waters last. Order of operations costs nothing.

If you want to surf

  • Use the suggested area on Big Lake. It's mapped where the water is deepest and farthest from shorelines, docks, and moored boats.
  • Depth first, always. The turbulence that resuspends sediment goes down, not out.
  • Vary your track. Moving your line spreads the energy. Free, and it works.
  • Drop ballast on the way in.
  • Consider a bigger lake for surf days. Larger water exists within a reasonable tow. Check two things first: whether the destination has its own ordinance — a growing number of Wisconsin lakes do — and decontamination before you come back.
  • Think about time of day. Early morning and evening put your wake into the busiest shoreline hours. Midday is usually easier on everyone, including you.

There are not many wake boats on this chain. That's precisely why this can still be a conversation between neighbors.

 
Data & Studies

We've tried to source every claim on this site and to be clear about what's a measurement, what's a recommendation, and what's contested. Where researchers declined to recommend policy, we say so. Where the wake sports industry disagrees, we've included their position.

Boating & Depth Data

Our chain, by the numbers

Our three connected lakes feature vastly different depths, shoreline profiles, and bottom compositions. To protect aquatic habitat, prevent sediment resuspension, and minimize shoreline erosion, researchers recommend maintaining a minimum depth of 20 feet for wake surfing, 10 feet for powerboat cruising, and a buffer of at least 500 feet from shore.

Use the guide below to review lake dimensions, public access points, and how each water body aligns with research recommendations and voluntary District Board suggestions.

Surface area, depth, available distance from shore, bottom composition, and public access for Big Lake, Round (Wind), and Church Pine.
Lake Surf Suitability Mean Depth Max Depth Surface Area Bottom Landing
Big
Depth: 20 ft+ in Suggested Area Shore Buffer: 500 ft+ Zone
17 ft (avg) 24 ft 245 acres 85% sand · 10% muck · 5% gravel Yes
Round (Wind)
Depth: 22 ft Max Shore Buffer: Too Narrow
Not listed 22 ft 39 acres 90% sand · 10% muck No
Church Pine
Depth: Deep Trench Shore Buffer: Too Narrow
23 ft 45 ft 87 acres 80% sand · 15% muck · 5% gravel Yes

* A note on Round (Wind) Lake's depth: The WDNR lake listing shows a maximum depth of 7 feet. The District's comprehensive lake management plan and aquatic plant management plan both show 22 feet, which matches on-water soundings. We believe the DNR figure is a clerical error and have used 22 feet here.

Data Sources: Wisconsin DNR lake data (area, depth, bottom composition). Depth and distance recommendations: University of Minnesota St. Anthony Falls Laboratory (2022, 2025). Note: A vessel 500 feet from shore requires clearance on both sides, meaning a lake must exceed 1,000 feet in total width to qualify. Water flows: Church Pine → Round → Big → Horse Creek.

The primary research

The main body of work comes from the University of Minnesota's St. Anthony Falls Laboratory (SAFL), an interdisciplinary fluid mechanics lab established in 1938. Its boat-wake research program launched in 2020 and has published two phases, with a third completing fieldwork in fall 2025. Funding came primarily from more than 200 individual public donations, plus Minnesota's Environment and Natural Resources Trust Fund for Phase 2.

Phase 1 · February 2022

Wave height, energy, and power

A Field Study of Maximum Wave Height, Total Wave Energy, and Maximum Wave Power Produced by Four Recreational Boats on a Freshwater Lake

Method
Field measurement, not computer modeling. Four boats — two wakesurf, two typical recreational — run on Lake Independence, Minnesota, in fall 2020 across a range of speeds and ballast weights. Five wave-height sensors were installed at a test shoreline and left in place for the duration. Boats were driven at four set distances from shore — 225, 325, 425, and 625 feet — five passes per condition.
Findings
  • At both slow and fast speeds, the wakesurf boats produced the largest waves measured in height, energy, and power.
  • In each boat's most typical operating mode, wakesurf boats required more than 500 feet from shorelines, docks, and other boats for their wake characteristics to drop to levels comparable to the non-wakesurf boats — described by the researchers as a little less than 1.5 football fields.
  • Under the conditions producing the largest wave, that distance was more than 425 feet.
  • In both modes, the indicated distance is more than twice the 200 feet that Minnesota guidelines then recommended for common recreational boats.

Stated limitation. Phase 1 characterized the waves themselves. It did not measure shoreline erosion, water quality, or ecological impact. Those questions were left to later phases.

Summary Full report

Phase 2 · July 2025

Below the surface

Lakebed and water-column impacts of seven powerboats. 185 pages.

Method
Seven powerboats commonly used on Minnesota waters — two deck boats, three bowriders, two wake boats — tested across the 2022 and 2023 field seasons on Lake Minnetonka. Acoustic sensors measured pressure and water velocity through the water column and at the lakebed, at two locations and two depths, alongside sediment sampling and water-quality parameters. Each boat was tested in its two most-used settings: for non-wakeboats, leisure cruise and planing; for wakeboats, surfing and cruising. Five passes directly over the sensors per condition.
Findings
  • All powerboats produce currents and turbulence capable of disturbing the lakebed. This is not a wake-boat-only finding.
  • The more powerful turbulence from wakeboats can directly resuspend sediment into the water column.
  • Resuspension can indirectly release nutrients such as phosphorus from sediment, which can stimulate excessive algae growth.
  • All powerboats cruising or planing should operate in 10 feet of water or greater.
  • Wakeboats during surfing should operate in 20 feet or greater.
In the researchers' words
Co-author Jeff Marr framed the takeaway around operator behavior rather than restriction: that avoiding shallow spots makes a large difference for all motorized boats, that staying in deep water while wakeboarding or surfing is an easy and effective way to both enjoy and protect the water, and that boaters should give space between their boat, other boaters, and the shoreline.

Summary Full report Researcher FAQ

Phase 3 · fieldwork completed fall 2025

Wind waves vs. wake waves

Compares wind-driven waves against boat-generated wake waves and their respective impacts on the lake environment.

This is the phase most likely to address a fair question wake boat owners raise — how enhanced wakes compare to what a windy afternoon does on its own. Results pending.

What the researchers have not done. SAFL has consistently declined to recommend specific regulations. The lab has published measurements and operational guidance and left policy to legislators, local governments, and lake associations. Anyone citing these studies as calling for a particular ordinance is adding something the researchers didn't say.

 
Where to Surf

The District Board has adopted a recommendation designating where enhanced-wake operation makes the most sense on our chain — the water that is deepest and farthest from shorelines, docks, and moored boats.

That area appears as a green layer. See the link below the map or on the ‘Boat Viewer’ tab.

Interactive Boating Viewer

Click to expand the map of our Enhanced Wake Area

If you're launching here for the first time, this is the fastest way to see what you're working with.

Two things to know before you look:

This is a recommendation, not an ordinance.

No one can be cited for operating outside the designated area. It carries no penalty. We're asking, not requiring.

Our lakes are shallower than they look.

Big Lake averages 17 feet and tops out at 24. Church Pine holds a deep trench but is only about a quarter mile wide. Most visiting boaters have no way to know that from the surface, which is most of the reason this map exists.

State law still applies everywhere on the chain: slow-no-wake within 100 feet of any shoreline, dock, pier, or raft, and 200 feet for personal watercraft.

 
Links & Videos

We've included sources here that disagree with each other. The wake sports industry, lake advocacy groups, state agencies, and university researchers do not all reach the same conclusions, and you're better served seeing that directly than getting our summary of it. Sources are labeled so you know what you're reading before you click.

 

FOX 9 Report on Enhanced Wakes

Recommended viewing on wake boat impacts.

UMN SAFL Phase 2 lakebed study video

Released with the July 2025 report. Shows what the sensors recorded as different boats passed overhead — the downward energy is the part almost nobody has seen.

Last Wilderness Alliance Video

Recommended viewing on wake boat impacts.

Ballast tank decontamination demonstration

Pacific States Marine Fisheries Commission, referenced by WI DNR. Genuinely useful if you trailer between lakes.

 

The research itself

Law, rules, and agencies

Lake advocacy organizations

These groups advocate for wake boat restrictions. Their research summaries are useful; read them as advocacy.

The industry perspective

Included deliberately. If you're going to weigh the argument, weigh both sides of it.

  • Water Sports Industry Association The 200-foot / 10-foot-depth position, and the "Wake Responsibly" best-practices campaign covering repetitive passes, noise, and shoreline distance. Their operational guidance overlaps substantially with ours even where the numbers differ.
  • Your boat's owner's manual The ballast draining and decontamination sections in particular. Most owners haven't read them.

Our own materials

  • District recommendation on the enhanced wake area The Board's adopted recommendation and the reasoning behind it.
  • Comprehensive Lake Management Plan Our long-range water quality and stewardship plan — and the source of the 22-foot depth figure for Round (Wind) Lake.
  • Aquatic Plant Management Plan Plant survey data and management strategy across all three lakes.
  • Board meeting agendas and minutes Posted ahead of each meeting. All District members are welcome to attend.