The Ephraim Opera House had a seating capacity of 500^[1] and was open from about 1903 to 1914.^[2]

1. Polk’s Utah Gazetteer and Business Directory, 1903-1904
2. Polk’s Utah Gazetteer and Business Directory, 1903-1904, 1908-1909, 1912-1913, 1914-1915