Willcam97, my puddle, although quite a bit smaller, mirrors your pond.
A water test from A&M, and a Google Earth history search for water level fluctuations would be the first things I would do. The water test will give you info on the quality of the water, and the GE history search will let you know if some emergent plants are an option. Some plants like hardy lilies, can thrive for several years, and then a 2-3' water drop may wipe them out. At least here in the Emory area, Reeds/sages, Water Primrose, and American Pondweed seem to deal with various water issues the best.
I won't go into personal details here, but that 1-3' shallow water can be a bear to manage.
Does your pond manager have the ability to chemically treat aquatics from a boat, or does he spray/treat from the bank only?
