I've been spending the last month and a half on a lake taking recordings and studying them (learning the lake, depth, structure, etc) This lake is a COE lake and is 5 to 6 feet below where it is supposed to be right now. I had a partner with me (first time with me in the boat)--so we went to an area I haven't been in yet no problem. Coming out of 2-3 foot of water into 6-8ft now problem. Got the boat on plane (but still going slow--about 25mph) then the sound I didn't want to hear--the exhaust of a Merc 150--along with what felt like a sudden surge forward. Without much thought (about a second) I turned the engine off. Well the boat was sitting in the water leaning to the left. Yep you guessed it--ran aground. Holly cow. Now I have drifted onto a sand bar--but never at speed with the motor. Needless to say I felt sick. Well my partner stepped out of the boat--ankle deep--jeez. Luckily the bottom was kinda clay so we slipped the boat right off without too much trouble. I looked at my navigation screen and it seems I was off by maybe 5 or so feet on my track. So we went on about our business. So about 2 hours later we were going into another spot which I know could be sketchy going in (12ft on one side-a gravel bench about 20yrds wide that is about 1ft deep with one opening that is 12ft deep to go through then it is 40ft deep. You guessed it--was idling through (10-15mph at our backs) and bam-the sound of rocks banging on the hull, water coming over the transom. You got to be kidding me--turn the bilge on got out of the boat and we start pushing--took about 15minutes to get over the bench. About an hour later it started raining so we got out (safely) and went to the ramp and loaded up. Did a scan of the hull and no damage. What a day--don't want to do it ever again.