Station Information

Station ID: 540
Latitude: 13.438333
Longitude: 144.653333
Coastline code: 701
Station code: 1
Country: GUAM
Time span of data: 1948 – 2016
Completeness (%): 94
Frequency Code: 24
Date of last update: 02 Feb 2017

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR 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: GUAM, GUUG
Nearby Real Time Stations from VLIZ: guam
Fast Delivery Data from UHSLC station 53: hourly and daily
Research Quality Data from UHSLC station 53: hourly and daily

Station Documentation

Link to RLR information.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 27-APR-95 :
Station recoded as 701/001 on 27th April 1995 (was 700/001)
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 31-JUL-95 :
Guam 701/001 RLR(1964) is 9.3m below BM1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 31-JUL-95 :
Station is at Apra Harbor.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 2002Oct16 :
Guam - suspected land movement of 2-3cm in 1993 following earthquake.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 18-Jul-2011 :
The operators of the Guam tide gauge, Center for Operational Oceanographic Products and Services (CO-OPS) part of NOAA note that a change in the sea level trend occurs after the 1993 Guam earthquake. The stability of the tide gauge datum for the post earthquake is therefore a concern.CO-OPS continue to monitor the site.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Nov-2011 :
Using information from the NOAA website the RLR diagram has been revised. Previous Primary benchmark BM 1 no longer appears in the NOAA reports. Primary benchmark NO 4 1949 2.996m above gauge datum appears on the original RLR diagram as a secondary benchmark.

Data Authority

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