Susquehanna River to Flood: Susquehanna River now forecast to crest at 26.2 feet. Breaking News Susquehanna River now forecast to crest at 26.2 feet in Harrisburg Published: Wednesday, September 07, 2011, 5:06 PM Updated: Wednesday, September 07, 2011, 5:12 PM By The Patriot-News Forecasts for where the Susquehanna River will crest in Harrisburg have steadily increased in the last two days, and the National Weather Service is now calling for the river to crest at 26.2 feet early Friday morning. Flood stage for the river is 17 feet. At 20 feet, flooding is considered moderate, and at 23 feet, it's...