Early years.
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Pre big dig
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Post big dig.
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The numbers youre referring to are the original size compared to the current size, not pre vs post big dig. Its worded a bit confusingly on many sites that talk about it, but the satellite views clear up what theyre saying.
The friends of boston harbor islands website lays it out more clearly:
“The island was initially composed of two small drumlins connected by a spit, with an approximate size of 49 acres (200,000 m2).”
“However, dumping of trash and dirt, together with subsequent landscaping, have resulted in a significantly larger island with a permanent size of 85 acres (340,000 m2), plus an intertidal zone of a further 28 acres (110,000 m2). The island is now composed of two artificial earth mounds, terraced with retaining walls, roads and newly planted vegetation.”
“When the Big Dig began work in Boston in 1992, some of the excavated dirt and clay was used to
resurface the island. The island was covered and built up by dirt, capped with two feet of clay, and covered with two to five feet of topsoil. Thousands of trees were planted, and paths, buildings, and a dock were built. The island opened to the public in June 2006, for use as a recreational area with hiking trails, a beach, and a marina with boat slips for visitors. It also has a cafe and visitors center.”
https://www.fbhi.org/fbhi.org-14032727084f3ae09e39c0a/spectacle-island.html