Tom, I would personally cover the spring ASAP. I just spent 4 hours today hauling clay to dump in a small pond that has a spring. I think another 10 hours of tractor work might do it. And, it might not. About 5 years ago, I used a backhoe to clean it out. I thought it would be a year round source of water. Instead, it sucks all of the water that runs in. Springs are aquifers that can take as well as give.