A dive team was called out at 4 p.m. to the 16300 block of East Shore Dr. after family members reported that they had not seen the victim since around 2 p.m. after he indicated he would go swimming in the lake.
Rescuers found the body a few minutes later, but the man was so tangled in underwater plants that divers couldn't bring him to shore until they brought in a boat and equipment to cut the plants.
"We could come in from the open water side end eliminate that risk of divers entangled in lily pads," said Lt. Rodney Rochon with the Snohomish County Sheriff's Office.
The warm weather has meant a higher-than-average amount of plant growth in the water, and experts say that is something swimmers should keep in mind.
"You can't really see," said master swimmer Michael Nelson. "There's not much visibility beyond your arm, so you're swimming along and all of sudden you it feels really strange and it kind of unnerves you a little bit."
The victim's name has not been released pending identification from the Snohomish County Medical Examiner.