THE AUGUST SUN BLAZED DOWN and turned the wooded ravine into a long green oven. Even the sound of water tumbling over rocks didn’t relieve the sensation of humidity and heat. I gave the oars a pull and guided the aluminum boat down the last few yards of a riffle into a quiet, shady pool. Visions of frosty glasses of beer danced through my head as I cast a floating plug toward the limestone bluff bordering one side of the pool. What happened next…