MAX LENGTH 25' Even if you fit just fine
We planned an entire weekend around staying at Lewis Lake only to discover after we'd claimed a good spot and gotten settled in (as directed) that they wouldn't allow us to stay because we had a 21' rv trailer and 17' Tahoe (both parked within the parking pavement and completely off the road) because we exceeded 25'. Getting kicked out on a busy weekend with literally no place to go was less than cool.
Campground has no views, sites are super packed together and the rangers patrol often but the location is great, lake it beautiful from what we saw and it seems like a great place for first come, first served if you have a tiny rig or a tent.
Month of VisitSeptember