Big Sable Point Lighthouse was constructed of Cream City brick. But it had degraded so much in 35 years that it had to be encased in iron plating. Grosse Point Light, also made of Cream City brick, had to be encased in concrete.
Big Sable Point Lighthouse was built of Cream City brick. However, it had deteriorated to such an extent in 35 years that it required protection by iron plating. Grosse Point Light, also constructed from Cream City brick, necessitated the use of concrete for its preservation.