Lyric discussion by Saevus 

"Green river flows like melting grass" is a simile. The author is just trying to get an image in your head. In this case it is off a river that is reflecting green grass on its surface. "Later it will run black down it's track into an ocean" The sun is setting so the water takes on a black. "She stands onthe bridge dim light on her back" Picture a girl standing on a bridge over this river with the setting sun at her back. I think this image is what the singer wants you to see. I would say he is looking at her from affar and only wishes he could be with her. The next part is about what it seems it would feel like to him to be in love. Souring over the world looking down on it. At least, thats what I think it means :).

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