Not sure if they close the gates at Newell cause it's a Provincial Park. There is a launch at Kinbrook Provincial Park and one at Lake Newell Resort.
Kinbrook is free of charge, LNR has a launch fee.
Crawling Valley closes it's gates end of Sept. till good ice up. It's an invasive species deterrent. No one there to inspect your boat
Maybe call EID (Eastern Irrigation District) they can give you info on all the Newell County waterways.