The State does not really have a crime defined called "Lewd Conduct", although some cities do have their own ordinances. Port Orchard and Everett are a cities that have a crime entitled "Lewd Conduct." For the most part, Lewd Conduct crimes are misdemeanors, although some are Gross Misdemeanors. If you are charged with Indecent Exposure, or the like, the penalties can be more severe. You should contact a Washington State Sex Crimes Attorney for more information.
You can find more information on Washington Sex Crimes Below.