Welcome to Square Pond Improvement Association

Square Pond is located on the border between Shapleigh and Acton, in southern Maine. The lake is spring fed and has few other natural inlets or outlets.

Today, most of the lakefront property is owned by summer residents from out of state. Over 400 camps and residences dot the shoreline. Many are now owned by second and third generation families. Each year, a few more “camps” are converted for year round residences.

The Square Pond Improvement Association (SPIA), an IRS 501C-3 organization, was formed by Square Pond lake shore property owners in approximately 1958. SPIA is dedicated to protecting the lake environment, especially water quality, shoreline and area wildlife. The SPIA is also active in promoting group recreation and water safety awareness.

Current News and Lake Announcements | View All »


  • SPIA Survey Results

    8/18/2019

    SPIA Survey Results

    Check out the results of the recent SPIA Survey

  • Clean Your Boat Free of Milfoil

    6/19/2019

    Clean Your Boat Free of Milfoil

    Minnesota Sea Grant's "Clean Your Boat Video" provides information on aquatic invaders and tips on how to properly clean your boat so that you will not spread them.

Conservation Initiatives

  • Invasive Plant Team Notes

    INVASIVE PLANT TEAM NOTES

    As always, the threats from invasive species are growing, especially with this year's mild winter, early spring and warmer summer. this creature.

    More Information »

  • MAINE'S MOST UNWANTED

    MAINE'S MOST UNWANTED

    Under Maine law, it is now illegal to transport ANY aquatic plant on the outside of a vehicle. It is also illegal to sell, propagate, or introduce to Maine waters these eleven invasive aquatic plants.

    More Information »

  • MYSTERY SNAILS

    MYSTERY SNAILS

    Generally found in flowing water or proximity to flowing water (e.g., river mouths). Feed primarily on particulate detritus in soft sediments.

    More Information »

Our Square Pond Gallery | View All »

  • Signs covered for the season!

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