The city of Lakeville continues implementing water management controls for Lake Marion, working with state agencies to regulate water levels and prevent flooding in the business district, according to a recent presentation on the lake's history.

Lake Marion has experienced dramatic water level fluctuations throughout its history, dropping 14 feet during the 1930s drought and rising 12 feet in less than two years during the late 1930s recovery period. The lake reached near-record highs in 1984, threatening recently built shoreline homes.

To address these significant fluctuations, Lakeville requires state permits to manage the lake's water outlets. The city's water resources management plan emphasizes protecting surface water quality, managing storm water, and using natural retention ponds to improve water quality.

Current regulations include no-wake boating restrictions when water levels exceed certain thresholds to minimize shoreline erosion and property damage during high water events. Deep water outlets can cause downstream flooding, particularly affecting the Lakeville Business District when lake levels are high.

Lake Marion has served as a central feature of Lakeville since 1853, when settler JJ Brackett established his homestead on the lake's south shore. The presentation highlighted the lake's role as both a vital community resource and environmental indicator throughout the city's development.