A massive spill of water into the Ogeechee River on Saturday night, when a dam holding back an irrigation lake failed, did not produce the flooding officials feared might occur. Still, areas surrounding the breach were not left unscathed. The dam, which held at bay approximately 80 acres of water 24 feet deep, let loose at about 10:30 p.m. Saturday, sending large trees and other debris sweeping across Georgia Highway 17 in Screven County, near Old Ogeechee Road, just north of the river.