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NAVD 88 GENERAL ADJUSTMENT COMPLETION DATE OF JUNE 1991:
WHAT DOES THIS REALLY MEAN?
The general adjustment of NAVD 88 was completed in June 1991.  This means that bench marks included in the NAVD 88 Helmert blocking phase (approximately 80 percent of the total) have final adjusted heights available.
Bench marks in “stable” areas which were removed from the adjustment (denoted as “POSTed”) because older data did not fit with the latest data was  incorporated into NAVD 88 during fiscal years 1992-1993.