DF&W officials came to a WBC meeting back in the '90's, and we asked about the "electric only" rules. They said that if DF&W says in their list that the lake is "electric only", then no gas motor may be mounted on the boat. If the County posts the lake as "electric only", then it's ok to have a gas motor on the boat, but not legal to use it. Kinda dopey, but that's government agencies for you.
About Lk. Meridian...I can't remember Meridian ever being "no gas". Lots of skiing and water turds on there. The day I caught the LM in the picture, IIRC, we didn't run the gas motor even to put it back on the trailer, and we made one full lap of the lake. Hadn't been on it for decades.
I must say, that while the launch ramp itself (park, King Co. or Kent?) is fine, it was (like Coulon and many others) obviously designed by somebody who had never launched a boat, backed a trailer, or even parked a truck/trailer combination. Not ideal, leading to problems for folks who can't back a trailer around a corner and into the water. Also, IIRC, not designed for car-toppers and "assemble at the beach" boats, without putting those in the way of trailer boats. Too bad.