NONE! The National Park Service charges no fees, nor is a fee charged at the Lewis and Clark Visitor Center. However, a couple of park partners do charge:
Niobrara State Park, Ponca State Park and Lewis and Clark Lake State Recreation Area (NE) require an annual valid entry permit. It is $20.35 per vehicle. A second permit costs $10.35 The daily permit is $4.35 per vehicle.
$0.35 is a vendor fee. If the permit is purchased in the park, the fee is $20, $10 and $4 respectively.
Lewis and Clark State Recreation Area (SD) requires an annual valid entry permit. It is $23 per vehicle. A second permit costs $11.50. The daily entry permit is $3 if the vehicle has only one occupant; otherwise, it is $5 per vehicle.
DaKine
Hurley