Lake Constance Water Levels Drop to Historic June Record Low.

Lake Constance, which borders Switzerland, Germany, and Austria, has recorded its lowest water level ever measured for the month of June. Experts attribute the dramatic decline to months of unusually low rainfall and below-average snowfall in the surrounding mountain regions.

The western section of the lake, known as the Untersee, has been particularly affected. Several boats have been left stranded along the shoreline as water levels continue to fall. According to water management officials in the Swiss canton of Thurgau, exceptionally dry weather conditions since early spring have significantly reduced the amount of water flowing into the lake.

April was especially dry across the region, while winter snowfall remained well below normal levels. As a result, the usual snowmelt that helps replenish the lake during spring was insufficient to restore water levels.

Lake Constance is particularly vulnerable to extended dry periods because, unlike most major Swiss lakes, its water levels are not artificially regulated. Together with Lake Walen, it remains one of the few large lakes in Switzerland that fluctuates entirely according to natural conditions. This makes both droughts and flooding events more noticeable.

Current measurements indicate that Lake Constance is approximately one metre below the long-term average for June. The situation is also affecting transportation and tourism. Shipping operator Untersee und Rhein (URh) has reported navigation difficulties, with parts of the Rhine River between Stein am Rhein and Diessenhofen currently inaccessible to passenger vessels due to low water levels.

Environmental experts warn that prolonged drought conditions and rising temperatures could lead to more frequent water shortages in the future. The development has renewed concerns about climate change and its growing impact on Switzerland’s lakes, rivers, and natural ecosystems.