In the fall of 1911 the Sacramento Diocese created a new parish from the Truckee Parish to be known as Sacred Heart. It would encompass two counties—Lassen and Modoc—a region comprising some 8,500 square miles (equivalent to size of the State of Maryland).

Father Philip J. O’Reilly was the first priest assigned arriving from Marysville. Father O’Reilly first established residence at Alturas, were a parish briefly existed in the 1880s. On December 17, 1911, Father O’Reilly held his first Mass in Susanville, and brought welcomed news that Mass would be held in Susanville on the last Sunday of each month. It should be noted that prior to this, Mass was held maybe once or twice a year, with Father Thomas Horgan riding circuit over a five county area making a 600 mile round trip.

On January 2, 1912, Father O’Reilly chose the date to open the Parish of Sacred Heart. He marked the event when he inscribed it by writing in front of the Baptismal, Marriage and Death Registers. He would later write in each one, that on December 2, 1915, Modoc County became a separate parish, except for Likely, which was added to Modoc exactly a year later.

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