The date of the order ending is May 29th. I'll attach the actual order here,which seems clear as mud, but the gist of it is:
●In Grand County, all campgrounds on public lands shall remain closed. All dispersed camping areas on public lands shall remain closed, except for Essential Workers and Primary Residents of Grand County, Utah, Spanish Valley, Utah, and Green River, Utah.
●An Essential Visitor is any individual renting, lodging, or camping for an amount of timeless than 30 days for the purposes of work within Grand County, or for an employer within Grand County, and their spouse and dependents. Primary Residents are any individuals renting lodging for periods of greater than 30 days, or who are permanent residents of Grand County.
What I'm seeing is you can indeed run the river, you just can't camp... Note at the end of the order, it gives the local police and sheriff authority to enforce, but that's pretty vauge..
This information came from here https://www.seuhealth.com/covid-19