Well unless I read this incorrectly it looks to me like it is legal...

Fish or shellfish may be cleaned or portioned
while in the field with the following
exceptions: It is unlawful for an angler to fail
to retain proof of compliance with species,
size, number, weight, sex or wild or hatchery
origin restriction, if such restrictions apply,
until the angler is ashore and has finished
fishing for the day.

IN THE FIELD OR IN TRANSIT
Anywhere other than at an ordinary
residence. Dockside fish cleaning facilities,
boat ramps, and cold storage lockers are
considered in the field.