The lake weir, located at the lake outlet was reconstructed in 1999 with a concrete weir at a level of 803.5 feet above sea level. Its purpose is to keep the lake level as constant as possible during the varied weather conditions that are experienced in the region. When the lake level exceeds 803.5 the water flows over the weir into Honeoye Creek. During times when the lake level drops below 803.5 the weir prevents additional water from draining out of the lake. The Honeoye Valley Association purchased and installed a lake level monitor in the lagoon at Sandy Bottom Park in August 2004. This allows monitoring lake level on a continuous basis. The USGS operated a similar lake level monitor from 1971 to 1995, when it was removed for budgetary reasons.