Yes you do need reservations. There was sign posted that only reservations were allowed. We were just there last week.
When I visited reservations were required, in advance mind you, for ANY type admittance. That was about 1st August or end of July 2020. Possible could have changed policies since then so I would be on the safe side and contact the park office.
Just friday thru Sunday.... Any other time you can without one..
For campsite or cabins, yes, you need reservation. For day use, not necessarily need a reservation
Reservations because they limit how many people are allowed in the park. They sell the day passes online as well.
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