EM 1110-2-1100 (Part II)
30 Apr 02
Table II-5-7
Datums for Reference Tide Stations (Harris 1981)
Extremes
of Record
Interval for
Normalizing
Establishing
Factor2
Station
MSL
MTL
NGVD
MLLW
MLW
MHW
MHHW
Highest
Lowest
of Datum
Atlantic and Gulf Coasts
--3
--3
Eastport, Maine
M
9.2
9.10
9.00
0.00
18.20
23.1
-4.4
1941-61
Portland, Maine
M
4.5
4.50
4.28
0.00
9.00
13.9
-3.7
1941-59
4
Boston, Mass.
M
5.2
5.05
4.89
0.30
9.80
14.2
-3.5
1941-59
Newport, R.I.
M
1.6
1.75
1.37
0.00
3.50
13.5
-2.9
1941-59
5
-3.4
1941-59
New London, Conn.
M
1.4
1.30
0.97
0.00
2.60
10.7
-3.55
Bridgeport, Conn.
M
3.4
3.35
2.86
0.00
6.70
12.4
1967 (1 yr)
Willets Point, N.Y.
M
3.6
3.55
3.02
0.00
7.10
16.7
-4.1
1941-59
New York, N.Y.
(The Battery)
M
2.3
2.25
1.81
0.00
4.50
10.2
-4.2
1941-59
--6
--6
--6
Albany, N.Y.
M
2.5
2.5
0.00
4.60
1941-59
Sandy Hook, N.J.
M
2.3
2.30
1.79
0.00
4.60
10.3
-4.4
1941-59
Breakwater
Harbor, Del.
M
2.1
2.05
1.69
0.00
4.10
9.5
-3.9
1953-61
10.05
Reedy Point, Del.
M
2.8
2.75
2.45
0.00
5.50
-6.3
1957-61
7
Philadelphia, Pa.
M
3.2
3.10
2.14
0.00
6.19
10.7
-6.6
1941-59
0.428
Baltimore, Md.
M
1.0
0.97
0.57
1.52
8.3
-4.5
1941-59
9
Washington, D.C.
M
1.97
1.97
1.43
0.52
3.42
11.9
-4.2
1941-59
Hampton Roads,
Va. (Sewells Point)
M
1.3
1.25
1.28
0.00
2.50
8.5
-3.1
1941-59
Jan. 1969
Wilmington, N.C.
M
1.9
2.10
1.52
0.00
4.20
8.2
-1.7
to Nov. 1973
0.3110
Charleston, S.C.
M
2.7
2.91
2.65
5.51
10.7
-3.3
1941-59
Savannah River
Entrance, Ga.
(Ft. Pulaski)
M
3.6
3.45
3.32
0.00
6.90
11.1
-4.4
1941-59
6
6
6
Savannah, Ga.
M
4.0
3.7
--
0.00
7.40
--
--
1941-59
Mayport, Fla.
M
2.3
2.25
2.00
0.00
4.50
7.4
-3.2
1941-59
Miami Harbor
Entrance, Fla.
M
1.3
1.25
0.96
0.00
2.50
6.4
-1.6
1941-59
Key West, Fla.
M
0.6
0.65
0.42
0.00
1.30
3.8
-1.6
1941-59
5
1941-59
St. Petersburg, Fla.
D
1.2
1.15
0.83
0.00
2.30
5.3
-2.5
1
Except as footnoted, chart datum is MLW for the Atlantic and gulf coasts and MLLW for the Pacific coast.
2
D = diurnal; M = mean.
3
MLLW and MHHW were not routinely derived for Atlantic and gulf coast stations for the 1941-59 epoch used for establishing most of the
datums.
4
Boston Low Water Datum (adopted about 1927).
5
Estimated value.
6
Data unavailable at the time of compilation.
7
Datums and the mean range for Philadelphia were revised in July 1979 based on observations for the period 1969-77.
8
Baltimore Low Water Datum (adopted 1922 by NOS and COE based on observations 1903-1921).
9
Mean River Level.
10
Charleston Low Water Datum (used since 1905 by NOS, and by COE in May 1929).
11
Low Water Datum at the Presidio, Golden Gate, San Francisco, is based on miscellaneous observations before 1907.
(Continued)
Water Levels and Long Waves
II-5-29
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