Flood Risk Near Sleeping Bear Dunes: Lake Level, Not Storm Surge

Why This Isn't a FEMA V/VE Zone Story

Ocean coastal flood risk is driven by storm surge -- a hurricane or nor'easter pushing a wall of water and waves ashore over hours, mapped by FEMA into V, VE, and AE flood zones based on wave-action exposure. Lake Michigan doesn't get hurricanes, and doesn't produce that kind of event. What it does produce is a slower, cyclical rise and fall in the lake's overall water level, driven by precipitation, snowmelt, and evaporation across the entire Great Lakes basin over months and years rather than hours -- and when the lake is high, wave action reaches much further inland, undercutting bluffs and consuming beach that would otherwise sit well above the water at a lower lake level. That's a genuinely different mechanism from ocean storm surge, and it calls for genuinely different research than a V/VE zone lookup.

The 2019-2020 Record High: A Real, Well-Documented Event

Lake Michigan's water level rose from a below-average stretch running roughly from 1999 to 2013 to a near-record high in late 2019, at more than 582 feet on the lake's standard measurement datum, before easing slightly starting in 2021, according to shoreline research published in peer-reviewed sources. That rise wasn't gradual and harmless -- it accelerated erosion at the base (the 'toe') of bluffs along the lake, and longshore currents rapidly redistributed the sediment that eroded away. Peer-reviewed research measuring shoreline change along the Lake Michigan east shore found 20 to 62 meters of shoreline retreat in studied stretches between 2013 and 2020 -- corresponding to 52% to 95% of some beaches' entire starting width lost in that single seven-year window.

One particularly severe documented storm event during that period eroded 10 to 20 feet of dune bluff in a single 12-hour period, driven by the combination of near-record lake levels, an additional roughly one-foot storm-driven surge on top of that, and large wind-driven waves -- a real illustration of how quickly this kind of event can move when high lake levels and a strong storm coincide. Elsewhere on Lake Michigan during this same period, a home in Muskegon fell into the lake after erosion destabilized the sandy bluff beneath it -- a documented case from a different Michigan lakeshore town, cited here specifically to illustrate the real mechanism, not as an event that happened in the Glen Arbor area.

Erosion Specific to the National Lakeshore Itself

Sleeping Bear Dunes National Lakeshore is not a passive backdrop to this lake-level story -- the National Park Service studies and documents erosion within its own boundary directly, because the dunes and bluffs are the park's core resource. In February 1995, a 1,600-foot stretch of popular beach at the Lakeshore suddenly slid into Lake Michigan, prompting NPS to bring in the U.S. Geological Survey to study the landslide-prone area and help predict when it might move again. The National Park Service's own materials describe the mechanism directly: the glacial moraine sediment that forms bluffs like Empire Bluff and the Sleeping Bear bluffs has been eroded by wind and waves for thousands of years, and as waves cut away the base of a bluff, the sand and gravel that's exposed gets picked up by wind and deposited on top -- meaning bluff-base erosion and new dune growth above are part of the same physical process, not two separate problems.

More recently, in 2025, erosion forced NPS to remove the Lake Michigan Overlook platform at Stop 9 on the Pierce Stocking Scenic Drive -- a wooden viewing platform that had stood for 44 years -- after strong winter winds eroded the sand supporting its pilings to the point that, in the park's own words, the western pilings were no longer on solid ground. NPS took the structure down for safety and had not announced rebuild plans as of that reporting. Separately, researchers documented significant, measurable shoreline retreat along the coastal zone of the Manitou Islands between 1999 and 2021, driven by aeolian (wind-blown) processes and dune 'blowouts' that reshaped the islands' western shore. None of this is a marketing claim about the dunes being dramatic -- it's the park's own, published research record.

EGLE's High Risk Erosion Area Program: Michigan's Real Regulatory Framework

Outside the federally protected National Lakeshore boundary, Michigan's Department of Environment, Great Lakes, and Energy (EGLE) regulates shoreline erosion risk through its High Risk Erosion Area (HREA) program, which currently designates roughly 250 miles of shoreline along Lakes Michigan, Superior, and Huron as high-risk, defined as eroding at an average rate of one foot per year or more over at least 15 years. Rather than measuring from the water's edge, HREA setbacks are measured from an 'Erosion Hazard Line' -- typically the top of an eroding bluff, not the shoreline itself -- and are calculated for both a 30-year projected recession distance (governing structures built to be readily moveable) and a larger 60-year projected distance (governing septic systems and larger, permanent structures).

Existing structures already built within these setbacks aren't required to be relocated to comply, but any new permit application triggers EGLE site review of the proposed structure's location relative to the current erosion hazard line. Notably, during the 2019-2020 high-water crisis, EGLE announced an expedited shoreline-erosion permitting process specifically for homes threatened by high lake levels -- a real, documented example of the state actively adjusting its permitting response to an emergency water-level event, not a purely theoretical regulatory framework.

Getting a Real Determination for a Specific Property

Whether a specific parcel near Sleeping Bear Dunes sits within a designated High Risk Erosion Area, how close it is to the current erosion hazard line, and what setback would apply to any new construction are all address-specific questions this page cannot answer in the abstract. EGLE's own High Risk Erosion Area maps (available through michigan.gov/egle) are the direct source for checking a specific parcel's designation, and EGLE's Water Resources Division is the direct contact for confirming current setback requirements before assuming a lot is buildable in a specific location relative to a bluff or shoreline.

This page does not name a specific erosion rate, current lake level, or HREA designation for any individual Glen Arbor-area address, because these genuinely vary parcel to parcel and change as EGLE updates its mapping and as the lake's level continues its natural multi-year cycle. Get the actual current determination for the actual address before budgeting construction plans or an insurance premium around an assumed setback.

What This Page Doesn't Cover

This page explains how lake-level-driven flood and erosion risk actually works near Sleeping Bear Dunes, and the real regulatory framework (EGLE's HREA program) that governs shoreline construction outside the federal park boundary. It does not state a current lake level as of this reading, a specific erosion rate for any individual address, or the exact acreage currently within Leelanau County's portion of the statewide HREA-designated shoreline. It also does not resolve whether a bluff-adjacent property inside versus outside the National Lakeshore boundary faces different construction rules -- that distinction, and the federal boundary's likely additional restrictions, is covered in more depth on this site's Seawall & Bulkhead page. Confirm all current lake-level, erosion-rate, and permitting facts directly with EGLE's Water Resources Division and, for anything near the federal boundary, the National Lakeshore's own office. Nothing on this page is engineering, legal, or insurance advice.