1964 - 1971 values based on readings of high and low waters.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Apr-1992
South Alaskan coastline earthquake prone - e.g. magnitude 9.2 earthquake of 28th March 1964 - see Savage Plafker, JGR,96(B3), 4325-4335, 1991
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Anchorage           821/012 RLR(1975) is 13.4m below BM15
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1994
Apparent datum shift around 1972-73.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Jun-2011
May-December 2007 values replaced to bring PSMSL record in line with corrected data on NOAA website. Original reported high frequency water levels were between 0 and 22 cm higher than they actually were.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Nov-2011
Using information from the NOAA website the RLR diagram has been revised. Primary benchmark previously called BM 15 13.237m relative to gauge datum corresponds with NOAA benchmark NO 15 RESET 1966. Value for this in both 1999 and 2003 reports is 13.231m.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 22-Jan-2016
A value of MTL-MSL=-344 mm has been applied to the RLR data for the period 1964-1971.  This value was taken from the NOAA website for the station.