Thanks ! No problem. Here’s how I went about it.
For this particular lake I already had the depth chart. But if you don’t they’re pretty easy to find online. Here’s a great resource for Wisconsin Lakes (https://dnr.wi.gov/lakes/maps/)
Once I had the depth chart, I brought it into Illustrator (You could use just about any graphics program that saves as SVG). This lake It’s only 44’ deep at it’s deepest, so I decided to place my depths at 4’ intervals, making 11 different levels. Once those were traced, I imported that into Easel and placed the depths 1/16" of an inch apart. That’s about it.