A coup0le of years ago, I thought the same thing. Temps had moderated after a real cold spell in '08. When we got to the river, my accurate temp gauge read 31 degrees. and I'm not making this up. I saw a rim of ice protruding off most of the shorelines about four to six feet wide, but the ramp was clear. Since the air temp that day was into the mid 50's, I thought it was still possible to catch a bass. Directly I motored my 18 ft. jet up to the first warm water vent (spring) and was very pleased at what I saw. Perhaps as many as 6 or 7 really nice largemouth were holding around and disappearing up into the vent. These fish, I figured would be easy to catch. I could hold my boat 10-15 feet away from them without spooking the bass in the least. The water temp at this distance from the opening was a "balmy" 34 degrees. We went through just about every piece of hair and plastic I had in my tackle boxes in in sizes from 1/4 oz. down to 1/64 oz. and couldn't get a response regardless of the type of retrieve we used. I settled on my trusty little black jig and actually bumped one of the larger bass over a dozen times on the snout with no luck at all. Frustrated, we decided to eat lunch right there with my maribou jig dangling about a foot down and about 3 feet from the boat in the crystal clear water. During my last sip of coffee, one of those rascal largehead bass, about 19 inches long, slowly swam up about 5 feet from the bottom and gently engulfed my stationairy black crappie jig. Quickly, I handed the rod to my partner to set the hook. He yanked with too much gusto breaking the 4 pound test. The large bass slowly submerged to the bottom just a few feet from us wearing his maribou mustache. There, the fish remained for at least the next hour as we could get no more bites.
Now this story gets even more pathetic. I decided to motor up to another hole to try out our luck. After another 2 hours of fruitless casting in the second hole, we decided to call it quits. On the 3 mile ride downstream, I noticed lots of floating ice, and it occurred to me that my wake created going upstream had dislodged many shoreline chunks sending them into the stream. I could run pretty fast downstream dodging a few here and there thinking to myself, "Oh, what fun this is! My glee didn't last long as ahead of me and only about a mile from the ramp, lots of those big ice chunks clumped together to form an impenetrable dam. I saw the mess in plenty of time to slow down.
First, I tried to butt the iceberg with my jon boat, but many of the chunks were nearly half the size of my boat and really stuck together. This blockage rached about 40 yards down, and totally coverd the entire width of the river. I nad unintentianally set the perfect trap for myself by dislodging all that shoreline ice. I needed a way to get downstream past the blockage before dark. For the next 15 minutes my partner and I tried one thing and then another. Finally I got the boat headed toward the shallow shoreline by punching holes in the floe with my wooden paddle. I got on my belly with my shoulders off the square-lipped bow and delivered as many overhead jabbing thrusts as I could with that blade. What a workout! I decided if I had to get out of the boat to break the ice, at least I would be in safer,shallow water instead of the deep hole out in the middle where most of the ice had collected. Blessedly as we neared the shoreline, the ice thinned out substantailly and every "thwack" of the paddle brought us a few inches closer to freedom. Relentlessly, I pushed on. We did make that 50 yard trek through the ice and returned to the ramp before dark. My wood paddle was missing about an inch of its tip, but I was thankful that I had it with me.
There's a good lesson here on motoring with ice around the shoreline, and my foolishness about wanting to catch a bass in very frigid waters. Deep, deep wintertime is best for reading about fishing and not actually doing it.