Station Information

Station ID: 1001
Latitude: 18.458333
Longitude: -66.115
Coastline code: 938
Station code: 21
Time span of data: 1962 – 2023
Completeness (%): 92
Date of last update: 16 Jan 2024

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

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.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: BYSP, ZSU1, ZSU4, N240
Nearby Real Time Stations from VLIZ: sanj, sanj2
Fast Delivery Data from UHSLC station 245: hourly and daily
Research Quality Data from UHSLC station 245: hourly and daily

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

San Juan 938/021 RLR(1974) is 10.2m below BM13

Documentation added 1993-07-05

Gauge moved to new location in 1977

Documentation added 2011-11-24

Using information from the NOAA website the RLR diagram has been revised. Primary benchmark is now 5371 A 1977 with a value of 2.6m relative to the gauge datum in the NOAA report of 2003 and 2.597m in the report of 1989. Previous benchmark NO 13 1962 is mentioned in the 1989 report with the same value of 4.386m relative to the gauge datum but does not appear in the 2003 report.

Data Authority

N.O.A.A. / N.O.S.
N/oes33, Ssmc4, Room 6531
1305 East-West Highway
Silver Spring,
MD 20910