22nd sentence of the 22nd book

Aiken Street Bridge in Lowell by Vassilios Giavis

The 22nd book* on my Kerouac bookshelf is Jack Kerouac's Dr. Sax (Grove Weidenfeld, 1987), and the 22nd sentence (in honor of today being the 22nd day of the month) is:

I could hear it rise from the rocks in a groaning wush ululating with the water, sprawlsh, oom, oom, zoooo, all night long the river says zooo, zooo, the stars are fixed in rooftops like ink. (p. 8)

Do you know what river Jack is talking about here? If you answer, spell it like he does in the subsequent sentence.