Why do you have to go to CPW headquarters.
As I recall when you leave Lake Powell they provide info that you'll be mussel-free if you follow their guidelines: Boat out of the water, drained and dry for 21 days.
Colorado has a different opinion on the dry/decontamination time.
And Utah says it is clean after 7 days in the summer if you do not have ballast tanks.
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I would think 7 days would be sufficient, boat sitting out in the baking sun. ^-^
I did whatever the pamphlet from Utah said, thought it was 21 days.