Laura, First I presume your LV 77 is simply a typo, and you meant LV 57.

Second, below is a link to Terry Pepper's page with interesting information on Grays Reef and the lightships.

http://www.terrypepper.com/lights/michigan/grays_reef/grays_reef.htm

And last is a link to a West Michigan Tourist Association page on Grays Reef which mentions that the light replaced a series of lightships, namely, LV's 57, 56 and 99. I suspect they got this information from the 1994 Inventory of Historic Light Stations where I originally read the information several years ago.


http://www.wmta.org/grays-reef-light-station-83/

I believe LV 103 was not mentioned in this case as the others were not only replaced they were removed from service at various dates mentioned in the link you provided, whereas LV 103, built in 1920, was kept in service and eventually became the Huron which at 89 years of age still exists as a museum at Port Huron, MI.

mg