I walked across the bridge on the lock and dam spanning the Neckar River.  The foam smelled like soap suds, and that is just what it was.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/24736216@N07">Roger Wollstadt</a> from Sarasota, Florida, U.S.A.
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/24736216@N07/2965027466/">Gundelsheim from Neckar River Lock (1960)</a>