Flood in Armstrong, Pennsylvania

The first of what eventually became numerous large ice jams were reported by ice observers on the Allegheny River and its tributaries by December 26th. This abnormally early ice development continued to build as frigid temperatures persisted. Early on the morning of the 19th, the river level at Lock 9, Rimer, Pennsylvania, quickly rose 9 feet. The water was from an upstream ice jam that had broken. Ice and flood waters from its tributaries continued and led to moderate to major flooding along the Allegheny River to Pittsburgh. Property damages for Clarion County include flooding on the Clarion River. Damages for Allegheny are totaled under the flood description for the Monongahela River.