View of the Karolinenwehr and the Old Town of Landsberg am Lech

The Lechner is called the Karolinenwehr.
The Karolinenwehr is a four-stage weir of the Lech near the old town of Landsberg am Lech.

To the right of the weir system, which was probably built in 1364, is the Mühlbach, which used to drive mills and is now used to generate electricity. The originally single-stage weir was severely damaged several times by floods and was expanded in the 18th, 19th and 20th centuries by installing additional stages. The weir has been rebuilt several times over the past decades, most recently between 1993 and 1996.
A bypass existed for rafting, on which rafts were led around the weir over the wooden plank route of the "long journey" for a fee. After rafting declined in the 20th century, the "long journey" was canceled in the 1970s.
de.wikipedia.org/wiki/Karolinenwehr

Wikipedia (Karolinenwehr, 2022-12-28):
de.m.wikipedia.org/wiki/Karolinenwehr
Wikipedia (List of monuments in Landsberg am Lech, 2022-12-28):
de.m.wikipedia.org/wiki/Liste_der_Baudenkmäler_in_Landsberg_am_Lech
“Lech weir … 210 meter long, four-stage facility diagonally to the course of the river, essentially 18th century, addition of the third weir floor in 1883, addition of the fourth weir floor in 1935, frequent renovations, most recently in 1994; north of the Caroline Bridge. … D-1-81-130-237”

Landsberg is always worth a trip.