I'll agree with the ad on CL. A buddy of mine who's growing produce in a high tunnel is begging tree trimming companies to bring him wood chips. The few he has got, he uses as walkways between the beds of plants. Keeps their feet from getting muddy, and after eventually breaking down over a few years, adds organic matter.
In fact, if ever you could chip the Willow, especially young trees with green sprouts in a separate pile, some may be interested in it to make a tea out of, for it's natural rooting hormone content, to water their plants with.
One man's trash....