Groundwater flows under all of Grand Island in a slowly moving river. This hidden resource follows the path of the Platte from southwest to northeast. It refills the Platte and Wood Rivers when the surface water is low and can draw from the rivers when surface water is high. Groundwater also feeds many of the waterbodies around town: L.E. Ray Lake, Suck’s Lake, Pier Park, Eagle Scout Park, Brentwood Lake, Rainbow Lake, Kuester Lake, and Hidden Lakes.
Groundwater levels are influenced by land elevation, rainfall, irrigation, pumping, river depth, and well use. Since the City began monitoring groundwater depths in 1967, groundwater has been shown to rise and fall in cycles. Depths have ranged from less than 5 feet to 30 feet below the surface.