I actually first discovered this crayfish colony almost a year ago, while visiting a nearby park. At the time I noticed a number of mud structures, which I thought resembled crayfish chimneys.
This particular location is nowhere near a standing body of water, which I believed would be essential for crayfish survival, so I dismissed the find, and decided there must be some other explanation for the mud structures besides crayfish.
Recently, I had the opportunity to visit the park again, and while there I decided to investigate the area to see if I could explain my earlier finding.
I quickly located a number of the mud mounds, finding around 20 or 30 or more chimneys in the park and on the grounds of an adjacent church.