Green Lake water clarity varies with the amount of suspended sediment (clays and silts) and/or plankton (microscopic plants and animals) in the water.
The graph below shows that water clarity improved following the 2004 alum treatment, which continues to be effective at reducing phytoplankton blooms. Water clarity in the late summer in 2008 was exceptionally high and we wait to see if the high clarity is present in 2009. Click the image below for more detail, or visit our Monitoring page for information.
