Allner See, lake in Germany

Allner See is an artificial lake in a bend of the Sieg river, separated from the village of Allner to the northeast by the A 560 motorway. It covers 0.10 km² at an elevation of 63.5 m. A small play and sunbathing lawn lies by the water; about 85% of the land area is closed to visitors and serves bird protection. Schloss Allner, a 15th-century castle, stands directly to the north.

Sand and gravel were excavated from 1979 for the A 560 motorway, leaving a pit about six metres below the water table. In 1986 the Hennef town administration decided to create a lake, and embankments and protection strips were built. Trees were planted and landscaping finished in 1990, the year the motorway opened.

The lake takes its name from the neighbouring Allner district, separated from the water by the A 560; Schloss Allner, a 15th-century castle, stands directly north of the lake. Around 85% of the land area is closed to visitors and serves bird protection, while a small play and sunbathing lawn may be used from 6:00 to 22:00.

Only a small play and sunbathing lawn may be used, between 6:00 and 22:00; roughly 85% of the land area is off-limits. Swimming is not officially approved as a bathing water, though the lake is stocked with fish for anglers and stand-up paddling is allowed, while other water sports are prohibited.

Around 85 percent of the land area is closed to visitors and serves bird protection; only a small play and sunbathing lawn may be used, between 6:00 and 22:00. The lake itself is not approved as a bathing water, though the English source reports swimming and stand-up paddling while other water sports are banned.