From this story on seattlepi.com:
Spokane County sheriff's deputies have arrested a 54-year-old man after he was spotted fishing naked Sunday on West Medical Lake. A father fishing with his two young sons complained after he spotted 54-year-old Dean H. Meginniss fishing completely naked. He said the man stood up in full view of the kids as their boat moved down the lake. Sheriff's deputies arrived and told the man to put on clothing, and he donned a pair of light-colored shorts and continued fishing. But deputies also ran a check on his name and discovered Meginniss had an outstanding warrant for stalking. Meginniss was arrested on the warrant, and also for indecent exposure. He was previously convicted for indecent exposure in 2009, making Sunday's arrest a felony.