In 1930, under Pastor Charles A. Sauter, the 100th anniversary of the existence of First Methodist Church as a congregation was observed.

"The flood of March, 1936", writes Pastor Thomas M. Stone, "shall long be remembers because of its devastating waters that swept the West Branch Valley of the Susquehanna. The water in the Church stood at the record height of seven feet, eight inches. Up out of the damage and destruction to the Church, an energetic people determined to go forward. The foundation walls have been reinforced and are now like a solid rock. A complete transformation has been made on the first floor. At the rear of the Church has risen a new Church School building, modernly equipped to meet the needs of a modern departmentalized Sunday School. The approximate cost of the new building and repairs to the first floor of the Church, made necessary by the flood, amounted to $23,700."

In 1943, during the pastorate of Dr. John F. Stamm. the congregation celebrated the reopening of the newly decorated sanctuary done at a cost of $800.

Concerning the flood of 1936, Pastor Stone wrote: "Let us hope that the mark shall stand as the last flood mark." But again (just ten years later) history repeated itself with an unpredictable flash flood on May 28, 1946. Augmented by a record deluge from the headwaters of Pine Creek, following three days steady downpour, the swollen Susquehanna overflowed the main business section of Jersey Shore, bringing its muddy waters to a height of three feet three inches in the first floor Sunday School rooms and inflicting heavy property damage of over $1,000. Within the short space of five months, our building had emerged again with a thorough renovation to the downstairs. The Sunday School rooms have been completely transformed with freshly painted walls in attractive tints.