The causeway allows us to reach the telescopes no matter what the lake level may be. Originally when the the observatory was first built in 1970 there was no causeway and the dome building had to be reached by boat when the lake was high. After a couple years, and when the lake managment had changed, the causeway was built up. Electrical, telephone and data network, water and sewer lines are inside the causeway.
The area around the causeway and observatory is a popular fishing spot on the lake.