WISCONSIN RESERVOIR REPORT

Last Updated: January 1, 2026

Wisconsin's network of dams and reservoirs is currently experiencing a trend of lower-than-average water levels, as evidenced by the latest observations of gage height measurements. Lake Winnebago, the state's largest inland lake, recorded gage heights in Oshkosh and near Stockbridge at 2 feet and 2 feet respectively, both below the average of 2.61 feet and 2.57 feet. Similarly, Lac Vieux Desert near Land O'Lakes, Devils Lake near Baraboo, Lake Mendota, and Lake Monona at Madison, as well as Lake Waubesa at McFarland, are all reporting gage heights below their respective averages. These are significant water bodies in Wisconsin, and their reduced levels may be indicative of broader environmental factors affecting the state's water resources.

Cross-referencing multiple data sources, including the "The Biggest Weather Moments Of 2025 In Minnesota - Duluth Country Radio," which can provide insights into regional climatic patterns, and "After years of safety lapses, feds yank license for Michigan hydro dam - MLive.com," which highlights regulatory and safety issues that can impact dam operations, suggests a complex set of factors influencing the observed conditions. The lower water levels across Wisconsin's dams and reservoirs could be attributed to a combination of below-average precipitation, potentially diminished snowpack, and river flows that have failed to replenish basin storage to normal levels. While the presented data does not directly link specific weather events to the observed water levels, the historical context from the past year's weather moments may provide clues to the current hydrological shortcomings. It is crucial for stakeholders and residents to closely monitor these conditions, as they could affect water availability, dam operations, and possibly necessitate conservation measures if trends continue.

Wisconsin has multiple reservoirs and dams that play a crucial role in providing water for irrigation, hydroelectric power generation, and recreational activities. The major reservoirs and dams in the state include Lake Winnebago, Lake Wisconsin, Castle Rock Lake, and Petenwell Lake. These reservoirs are fed by several rivers and creeks, such as the Wisconsin River, Fox River, Rock River, and Black River. The hydrology in the area is influenced by the snowpack in the northern mountains, particularly during the spring and summer months when snowmelt contributes to the streamflow. In recent years, Wisconsin has experienced both record high and low water levels due to changing climate patterns and extreme weather events. In 2021, drought conditions in the state led to lower than average water levels in some reservoirs and creeks. However, seasonal trends also play a role in water levels, with typically higher levels in the spring and early summer months. Overall, reservoirs and dams remain an important component of the state's water infrastructure, and their management is critical in ensuring sustainable water use and management.

Wisconsin has multiple reservoirs and dams that play a crucial role in providing water for irrigation, hydroelectric power generation, and recreational activities. The major reservoirs and dams in the state include Lake Winnebago, Lake Wisconsin, Castle Rock Lake, and Petenwell Lake. These reservoirs are fed by several rivers and creeks, such as the Wisconsin River, Fox River, Rock River, and Black River. The hydrology in the area is influenced by the snowpack in the northern mountains, particularly during the spring and summer months when snowmelt contributes to the streamflow.

In recent years, Wisconsin has experienced both record high and low water levels due to changing climate patterns and extreme weather events. In 2021, drought conditions in the state led to lower than average water levels in some reservoirs and creeks. However, seasonal trends also play a role in water levels, with typically higher levels in the spring and early summer months. Overall, reservoirs and dams remain an important component of the state's water infrastructure, and their management is critical in ensuring sustainable water use and management.