The period of significance of the district dates back to 1875.

The period of significance is 1914, which was the year construction was complete.

The period of architectural, commercial, industrial and political significance is from 1825 to 1949.

The dam's major period of significance was 1925 through 1949.

The period of significance for the district runs from 1881 to 1955.

The period of significance for the District is 1750 to 1949.

Advent at that time, as it is today, would have been a period of spiritual and symbolic significance within the church.

The period of significance for the district is 1860-1936.

The period of architectural significance for the district is 1905-39.

Most were built between 1880 and 1930, the district's period of significance, with some dating to the 1810s.