Station Information

Station ID: 311
Latitude: 38.983333
Longitude: -76.48
Coastline code: 960
Station code: 80
Time span of data: 1928 – 2023
Completeness (%): 96
Date of last update: 10 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: ANP6, USNA, LOYF, ANP1, ANP5

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Annapolis 960/080 RLR(1974) is 8.4m below BM1

Documentation added 1993-07-29

Low values in early 1977 follow a data gap but are probably correct - for example, compare to 960/081 Baltimore. Previously this data had been flagged but because Baltimore compares well the flags have been removed.

Documentation added 2011-10-12

Using NOAA data the RLR diagram has been revised. Previous Primary benchmark was BM 1 now referred to as BM 1 1928. Original value was 2.957m above the gauge datum. In 1986 this value was 2.949m and in 2003 2.942m New Primary benchmark is BM 7 with a value of 2.876m in 1986 and 2.869m in 2003.

Data Authority

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