Lake Levels

Wonder Lake was designed with a “run-of-the river” dam spillway, where all flow leaving the lake cascades over a concrete spillway with a fixed (non-adjustable) weir. This weir elevation is fixed at 803.0 feet above sea-level.
Lake Status

The Fight Against Invasive Species

The Wonder Lake Master Property Owners Association is reminding boaters, anglers, and water skiers to remove, drain, and dry after a day on the water to prevent the spread of invasive species. These Be a Hero—Transport Zero™ steps can now be found at 14 boat ramps around the Illinois private lake.
Lake Status

Hackmatack National Wildlife Refuge

The Hackmatack National Wildlife Refuge is a newly established United States national wildlife refuge that will include noncontiguous properties, especially tallgrass prairie patches, wetland properties, and oak savanna parcels, located in the northwestern region of the Chicago metropolitan area and the southern part of the Milwaukee area.
Lake Status

Managing Dead Carp

Subdivision and lakefront properties can experience a significant die-off of carp in the spring or early summer, which can occur on other area lakes as well.

Lake Status

Newsletters

About the MPOA

Monthly newsletters will keep you up to date on the activities on and around Wonder Lake.

September 2025 newsletter

News from MPOA President Brad Dennison — Yacht Club is removing buoys October 4th Time for everyone to be careful when enjoying late season boat rides! Thank you to the volunteers from the Yacht Club for taking the time to put the safety buoys in and remove them each season. Protect Wonder Lake’s Shoreline The MPOA has invested millions of dollars in dredging Wonder Lake and thousands more installing rip rap to safeguard the islands. These efforts are vital—but they only go so far if individual shorelines remain unprotected. If your shoreline lacks protection, it’s equivalent to dumping wheelbarrows of soil directly into the lake.

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M.P.O.A. Bylaws

ARTICLE I  
Section 1. The name of this corporation shall be MASTER PROPERTY OWNERS’ ASSOCIATION, INC. FOR THE WONDER LAKE, ILLINOIS AREA. (Revised 9/13/2023) Section 2. This Corporation (hereinafter referred to as the M.P.O.A.) is an Illinois not for profit corporation, chartered by the Secretary of State on September 18, 1965, as provided by the General Not For Profit Act of Illinois, approved July 17, 1943, in force January 1, 1944.

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