April 3 and 4 are weekdays and it's more likely to have a site available than a weekend day. You may just call Vogel to inquire about "walk in" sites. Most State Parks save a few sites available for those that just show up on a first come, first served basis.
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited