The Foothills Soccer Center seems to be by some kind of dump. There were two large campers parked which I think were probably related to the dump, not the soccer tournament going on.
Interestingly, although it's in the middle of nowhere it's surprisingly accesible by bike because it's only a block or so from the Western Headworks Irrigation Canal bike path. At least, I think so— getting off the canal path can be tricky, so I'm not sure if it's close by not connect-able or what; as it turns out, we drove.
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