1964 - 1971 values based on readings of high and low waters.
Documentation added 1992-04-02
South Alaskan coastline earthquake prone - e.g. magnitude 9.2 earthquake of 28th March 1964 - see Savage Plafker, JGR,96(B3), 4325-4335, 1991
Documentation added 1993-07-12
Anchorage 821/012 RLR(1975) is 13.4m below BM15
Documentation added 1994-07-12
Apparent datum shift around 1972-73.
Documentation added 2011-06-23
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.
Documentation added 2011-11-24
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.
Documentation added 2016-01-22
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.