Low water reveals a new island in Lake Zurich

Lake Zurich is low enough to give Stäfa a temporary island. On October 5, 2026, the lake stood at 405.24 metres above sea level, revealing ground off the Stäfa shoreline that normally remains submerged. The site is associated with the Stäfner Stein, a rock that usually marks the visible feature in this part of the lake.

The newly exposed landform is small, yet substantial enough for a small boat to moor beside it and for visitors to stop for a picnic. Its appearance has drawn attention because the lake rarely falls far enough to reveal it. The current conditions follow a prolonged dry period, and the source report said no extended spell of rain was in sight when it was published.

The sight offers a precise, local measure of a much broader weather pattern. Water levels can turn a familiar shoreline into a changing landscape within days or weeks. For residents, boat users and visitors along the canton of Zurich, the exposed island is both a curiosity and a visible sign that the lake is well below its usual appearance.

The island has surfaced before, but only during exceptional low-water periods. According to the report, it was last visible 74 years ago, when Lake Zurich experienced its previous major low-water event. It had also emerged in 1909, during another period of extremely low levels.

Those dates place the current sighting in a longer record of fluctuations rather than making it a completely new geological feature. The land was always there beneath the lake. Dry weather has simply lowered the water far enough to expose it again.

The Stäfner Stein provides another historical reference. A mark cut or placed on the stone records the water level reached in 1909. The mark is now visible for the first time in many years, allowing people at the lakeside to compare the present level with an earlier low-water point.

The repeated appearance of the same landform also shows why local landmarks matter in tracking environmental change. Formal measurements establish the lake’s elevation, while a rock and a shoreline feature make that change legible to the public. At Stäfa, a historical marker has become part of the news.

The exposed shore remains a changing and potentially awkward place to land. The island may be large enough for a small boat, but its temporary character matters. Water levels can rise again after sustained rainfall, covering low ground and altering the route back to shore. The exposed surface may also contain uneven rocks, soft sediment and slippery edges that are normally hidden underwater.

Visitors who approach by boat need to account for changing depth around the island. A route that is passable at one water level can become shallow, obstructed or difficult to navigate as the lake falls. The same conditions can make departure harder if wind pushes a small craft toward exposed rocks.

The source report describes the site as suitable for mooring a small boat and enjoying a picnic. It does not establish that the area has been assessed as a formal recreation site. People approaching it should therefore treat it as an unmarked natural feature, keep clear of unstable edges and avoid leaving litter.

The lake’s low level also exposes more shoreline beyond the island. That broader change can affect access points, boat ramps and familiar walking routes around Lake Zurich.

The island will remain visible only as long as the lake stays unusually low. The report said Lake Zurich was unlikely to return to its normal level quickly, given the lack of prolonged rain forecast at the time. That leaves the feature open to visitors for a while, although its exact appearance will change with every shift in the waterline.

For Switzerland, the episode offers a clear example of how weather conditions become visible in daily life. A lake measured in metres above sea level can look dramatically different when the water recedes enough to uncover rocks, old markings and a small island. The change is especially noticeable in a densely settled region where the lake is used for transport, recreation and tourism.

The record also provides a reference point for future observations. Residents can compare the Stäfner Stein’s historical mark, the present shoreline and later water levels. Those comparisons cannot, by themselves, explain the causes of a dry spell or predict the next one. They do show how quickly a familiar landscape can shift.

For now, the island remains a temporary feature off Stäfa, visible because Lake Zurich has fallen to a level rarely seen in recent decades.