Prisovice, 463 46
Type of facility: Pond, reservoir, gravel pit
The larger of the two Písečáky lakes covers an area of 28.1 ha; the smaller one with its island is 12.6 ha. Since the 1970s, Velký Písečák especially has been used for swimming, fishing and the ever-popular windsurfing, which saw its heyday here back in the late 80s and early 90s. The new body of water led to the establishment of the Sailing Club and the construction of the related facilities on the eastern shore of the lake. Suring and sailing are banned on Malý Písečák. Stricter rules for activities on the lakes have been in place since 2008, in response to the opening of the camp between the two lakes, as well as the extension of hiking route no. 7318 and the no. 3048 bike trail and the establishment of a biocorridor and 3rd degree water supply zone. The swimmers who once made it across the large lake with the aim of finding hidden shallows are nowhere to be seen today, as because of sailboats swimming is only permitted within 20 metres of the shore. The western part of the shore of Malý Písečák can be used as a naturist beach. In recent years the covered refreshments stand has become a popular place for locals and tourists.
The area around Písečáky has not always been so peaceful. In early December 1993 tragedy struck the local Czech anglers’ association when huge numbers of fish died. These included some seven tonnes of carp, pike-perch, eel, pike and walleye, some of which weighed up to 20 kg. An investigation found the cause of death to be a high concentration of nitrogenous substances, caused by manure or fertilizer seeping into the water reservoir during a heavy thaw. In early March 2000, the Jizera River flooded, devastating the wider area around both lakes, followed on 23 July 2009 by torrential rain with gale-force winds.