Yes. Campground loops. As long as you pay the park entrance fee you can use any shower in the entire park. D loop is the newest camp loop and has the nicest showers 🚿
There showers in the campground... But that's the only place I know of that there are showers. They run on quarters or at least they used to.
The showers at the swim beach takes quarters and there is a change machine on the east side of the building facing the reservoir.
There are also showers at the swim beach but you have to pay $1
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