Rivnuts from Homestead, PA on 10/8/2020 10:10:57 AM:
The United States National Parks Service (NPS) has just updated their regulations to codify electric bicycles up to 750W as legal in all national parks where bicycles are already permitted. The new regulations, posted yesterday on the National Parks Service website, move to support the decree issued by the US Secretary of the Interior last year, stating that all e-bikes should be allowed in all US national parks.
https://electrek.co/2020/10/03/us-national-parks-services-updates-regs-allow-e-bikes-up-to-750w-with-exceptions/
This regulation does however allow individual park superintendents latitude as to where various classes of eBikes can be used within their parks.