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Pfuhl faced major challenges during his two decade long career as the elected chief of Johnstown, including population decline, the 1977 Johnstown flood and the collapse of the steel industry, which included one of the city's biggest employers, Bethlehem Steel.
This population decline accelerated in the second half of the 20th century when significant numbers of Castel del Monte's residents migrated to Wallonia, many to work in its coal mines.
It was then rebuilt by Governor Sir Graham Briggs in the late 19th century, but because of the population decline on the island, the Cottle Church again fell into ruins at the turn of the 20th century.
It is listed as Vulnerable by IUCN because of an ongoing population decline, estimated to be more than 30% over the last three generations (estimated at 15 years), inferred from over-exploitation, and habitat destruction and degradation.