The commercial certificated pilot was taxiing for takeoff from a remote river in a float-equipped airplane. The pilot said that during a right turn, a combination of river current and strong winds lifted the left wing. The right wingtip and the right elevator struck the water. The wing was bent upward about 30 degrees. The elevator was bent mid-span. The pilot said the wind was from the east about 20 knots, with gusts to 30 knots.