Please note: In many cases, the station position in our database is accurate
to only one minute. Thus, the tide gauge may not appear to be on the coast.
Many stations on the Gulf coast have large values for September 1961.
Documentation added 2011-11-24
Using information from the NOAA website the RLR diagram has been revised. Previous Primary benchmark BM 1 no longer appears on the NOAA website. Primary benchmark is now NO 7 1974 4.225m above gauge datum. This benchmark is included in the original RLR diagram as a secondary benchmark with the same value.