p. 204: The "pont-vanne de la' digue' (de débordement) du Rhin "no sluice, but lock,
p. 246 "Pont vanne sur la Lauter".
p. 314 "Continuing to follow … the lands of Fahr Wehr, Salmen Wehr and Stumpfwies (France) and Breiten Wehr …" passes through the central point of the bridge called Wehr-Brücke, … passes between the meadows of Wehr Wiesen (France, plan No. 60) Die Schanzen Theiler and Das Kriegs Wehr (Bavaria), (Wehr = weir)
p. 330 item 35 "bridge of Wehr, over the Lauter" (weir)
NON-NAVIGABLE WATERCOURSES AND OFF-LET CANALS FORMING PART OF THE FRONTIER.
p. 330 item 36 "Sluice bridge over the Lauter" (obviously same as below)
p. 335 item 39 "Weir over the Lauter"
p. 335 item 45 "Weir of St. Rémy Mill"
p. 335 item 50 "Weir of the Bienwald Mill"
p. 336 item 60 "sluice-bridge over the Lauter on the line of the Rhine". (confluent of Lauter with Rhine)
I know the small creek Lauter. It’s not navigable. That’s why no sluice is required.
See also
https://www.google.de/maps/@49.0326561,8.1541107,23878m/data...Compare the photo
https://stock.adobe.com/fr/images/pont-vanne-entre-les-sable... for Pont-vanne entre les Sables d'Olonne et la Chaume.