Some interesting documents from the USACE on water island
http://cdm16021.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/4710 (1 of 5)
http://cdm16021.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/4711 (2 of 5)
http://cdm16021.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/4712 (3 of 5)
http://cdm16021.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/4713 (4 of 5)
http://cdm16021.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/4714 (5 of 5)
https://www.saj.usace.army.mil/FortSegarra/ (source)