I knew you needed a freshwater license but I didn’t know this:
" Anyone fishing from a boat or other floating device on the Colorado River or adjacent waters forming the California-Arizona border must have a special use stamp in addition to either a California or Arizona fishing license. The holder of a California license must have an Arizona use stamp, and the holder of an Arizona license must have a California Use Stamp "
Some stamp they sell for another $3.00 which allows you to fish off a boat or float tube.
For those of my fellow fishermen/women who fish the Colorado.[;)]