The city is currently planning to convert the historic Hancock golf course into a private driving range. A group of neighborhood people are trying to get the city to consider other options, including turning the area into a park that largely keeps it as is, but with more diverse recreation resources and a more environment friendly design.
Algae blooms are caused in part by fertilizer use in the watershed. Golf courses are a prime source of fertilizer use, and Hancock golf course straddles Waller Creek (which feeds into Town Lake) on both sides. Turning it into a park would eliminate the fertilizer use, and restoring a natural riparian zone would help absorb pollutants and floods.
Study on algae blooms
I never said that this single golf course is solely responsible for the algae blooms. It's obviously a large problem with a lot of contributing factors. But this factor (the future or Hancock) was already something being discussed, so it presents a unique opportunity to actually do something about this problem (poison lake) that most people feel helpless about. Taking immediate action on the Dripping Springs Lawn Aficionados Club or ranches in Llano is not currently a thing. Getting citizen input on responsible Austin watershed protection is.
NASA has an interactive map where you can follow changes in your local rivers, and any other you are interested in, in the USA. Only a third of the largest rivers have changed color in the last 35 years. Only.