A lakes trophic state index can be determined by transparency, chlorophyll A or phosphorus
	For this study we used Secchi Depth Readings
	The formula above was obtained from the Maine PEARL website
	the numbers were obtained from standards based on mean secchi depths
	the Mean SD for Long Pond is 4.65
	Oligotrophic: 0-40
	Mesotrophic: 40-49
	Eutrophic: >50
	Under these determinations, Long Pond is an oligotrophic lake though very close to being a mesotrophic lake.
	Another notable point on this slide is that in 1978, TSI was 33.  This rise can probably be attributed to an increase in algal productivity