Ladder,
An idea I heard works good is to dig a trench into the bank of the pond. Dig it deep and well back into the side of the pond, if possible as deep as the pond and 40-50 feet into the bank from shore line. Fill with washed gravel after installing the well casing near the bank end of the trench so the water has to be drawn through the gravel to get there. Fill the gravel to regular water level and fill trench the rest of the way to ground level with dirt. You kind of end up with a well that is supplied with water from your pond.
