We went through Lassen last summer, but didn't stay in the park, we moved on the Burney Falls. Lassen is a treasure! Staying on the main roads worked for us, a 30' travel trailer and a 34' 5th wheel. We didn't go the the interior roads that lead to Butte Lake, but it's on my bucket list! Maybe someone can report on the road that leads from the main road to Butte Lake.
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