Former Heidesee and abandoned Heideseelokal

When and how it came about cannot be said with certainty. Older people from Gifhorn are of the opinion that the lake on the B 188 is a remnant of peat cutting. Wikipedia says it formed during the Ice Age. The only thing that is certain is that the lake has no spring, but is fed by groundwater and rainwater. Even before World War II it was a popular destination. The Heidesee restaurant opened on the front bank around 1938 and had a large terrace overlooking the lake. In summer you sat there, ate cake, drank coffee or took a paddle boat or later a pedal boat across the water. In winter, young and old alike sled and skated on the wide expanses of ice. Since the Heidesee was never particularly deep, it froze over relatively quickly.In the years that followed, visitors from far away dwindled, but it was still a welcome resort for people from the surrounding area. The Heidesee restaurant closed in 2011, after which the site was left to its own devices. With each passing year, nature reclaimed a little more - until finally two consecutive summers of drought caused the lake to dry up and overgrow from the shore.
Source: steynerley.de/der-verschwande-see

The building (former cafe) is in poor condition and the former Heidesee is more and more silted up. There is no water at all. The birch now gets back from the shore meter by meter.

In the past, in the last century and when the hotel was still used as an excursion restaurant, there was even a boat rental shop here. The jetty is still there. Little by little the lake has silted up. Unfortunately, it has dried up completely since around 2018. Hardworking young people collected the rubbish from the lake bed.
The lake had no inflow.
Apparently it is not due to the lower water table but to the lack of precipitation.