How does John Steinbeck use imagery in Cannery Row?

Example of Imagery:

The Carmel is a lovely little river. It isn’t very long but in its course it has everything a river should have. It rises in the mountains, and tumbles down a while, runs through shallows, is dammed to make a lake, spills over the dam, crackles among round boulders, wanders lazily under sycamores, spills into pools where trout live, drops in against banks where crayfish live. In the winter it becomes a torrent, a mean little fierce river, and in the summer it is a place for children to wade in and for fishermen to wander in. Frogs blink from its banks and the deep ferns grow beside it.