The Gère swan squadron ventures out onto the Rhône during the day and likely sleep under Place Saint-Louis. (just to the right of the Lattré de Tassigny bridge pictured here... coincidentally at the lowest point between Mont Salomon and Mont Arnaud)
<a href="//commons.wikimedia.org/wiki/User:SashiRolls" title="User:SashiRolls">SashiRolls</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>