Great Duck Island (Maine)
Historical Light List Characteristics
| 1893 | Fl R 10s. R133/4. | LHB Light List (Atlantic): 19 |
| 1898-1899 | ||
| 1905 | ||
| 1908 | ||
| 1915 | Fl R 10s. R14. fl 1. | USLHS Light List (Atlantic): 21 |
| 1917 | USLHS Light List (Atlantic): 23 | |
| 1920 | ||
| 1927 | USLHS Light List (Atlantic): 24 | |
| 1931 | ||
| 1935 | USLHS Light List (Atlantic): 27 | |
| 1940 | USCG Light List (Atlantic): 30 | |
| 1943 | USCG Light List (Atlantic): 32 | |
| 1945-1947 | ||
| 1950-1952 | Fl R 10s. R14. fl 0.8. | |
| 1953-1955 | USCG Light List - Vol. I-VI: 115 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 119 | |
| 1961 | USCG Light List - Vol. I: 119 | |
| 1963-1964 | ||
| 1965 | Fl R 10s. R14. fl 0.5. | |
| 1966 | Fl R 10s. R14. | USCG Light List - Vol. I: 228 |
| 1969-1972 | ||
| 1973-1979 | Fl R 10s. R19. | |
| 1982 | ||
| 1987 | Fl R 5s. R19. | USCG Light List - Vol. I: 2450 |
| 1990-1992 | USCG Light List - Vol. I: 2245 | |
| 1993-1995 | USCG Light List - Vol. I: 2295 | |
| 1996 | Fl R 5s. R15. | |
| 2004 | Fl R 5s. R19. Obscured 143°-2061/2°(631/2°). |
Historical Light List Optics and Structures
| 1893 | 5th | 351/2 | 661/2 | Cylindrical brick tower, near brick fog-signal house and rain shed, and about 250 feet southerly from row of three white dwellings. | LHB Light List (Atlantic): 19 |
| 1898-1899 | Cylindrical red brick tower, near brick fog-signal house and rain shed, and about 250 feet southerly from row of three white dwellings; white boathouse on shore westerly from light tower. | ||||
| 1905 | White, cylindrical, brick tower, near brick fog-signal house and rain shed, and about 250 feet southerly from row of three white dwellings; a stone oilhouse about 125 feet easterly; a white barn 230 feet northwesterly, and a white boathouse on shore westerly from light tower. | ||||
| 1908 | 4th | White, cylindrical, brick tower, near brick fog-signal house and rainshed, and about 250 feet S'ly from row of three white dwellings; a stone oilhouse about 125 feet E'ly; a white barn 230 feet N'ly, and a white boathouse on shore W'ly from light-tower. | |||
| 1915 | N/A | 41 | 67 | White, cylindrical tower. | USLHS Light List (Atlantic): 21 |
| 1917 | 42 | White cylindrical tower. | USLHS Light List (Atlantic): 23 | ||
| 1920 | |||||
| 1927 | USLHS Light List (Atlantic): 24 | ||||
| 1931 | 4 iov | ||||
| 1935 | USLHS Light List (Atlantic): 27 | ||||
| 1940 | USCG Light List (Atlantic): 30 | ||||
| 1943 | USCG Light List (Atlantic): 32 | ||||
| 1945-1947 | |||||
| 1950-1952 | 4 e | ||||
| 1953-1955 | N/A | USCG Light List - Vol. I-VI: 115 | |||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 119 | ||||
| 1961 | USCG Light List - Vol. I: 119 | ||||
| 1963-1965 | |||||
| 1966 | USCG Light List - Vol. I: 228 | ||||
| 1969-1979 | |||||
| 1982 | |||||
| 1987 | USCG Light List - Vol. I: 2450 | ||||
| 1990-1992 | USCG Light List - Vol. I: 2245 | ||||
| 1993-1996 | USCG Light List - Vol. I: 2295 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1893 | 10-inch steam whistle; blasts 3 sec., silent intervals 17 sec. | None | LHB Light List (Atlantic): 19 |
| 1898 | 10-inch steam whistle; blasts 2 sec., silent intervals 28 sec. | ||
| 1899 | 10-inch steam whistle; blasts 5 sec., alternate silent intervals 18 and 32 sec. | ||
| 1905 | 10-inch steam whistle; blasts 5 sec., alternate silent intervals 20 and 30 sec. | ||
| 1908 | |||
| 1915 | 10-inch steam whistle; gp. 2 blasts every 60 sec.: 1st blast 5 sec., silent 20 sec., 2d blast 5 sec., silent 30 sec. | USLHS Light List (Atlantic): 21 | |
| 1917 | USLHS Light List (Atlantic): 23 | ||
| 1920 | |||
| 1927 | Bell (1,200-lb.) if whistle is disabled. | USLHS Light List (Atlantic): 24 | |
| 1931 | DIAPHONE, air, blast 2.5 sec., silent 17.5 sec. | Bell if diaphone disabled. | |
| 1935 | USLHS Light List (Atlantic): 27 | ||
| 1940 | USCG Light List (Atlantic): 30 | ||
| 1943 | USCG Light List (Atlantic): 32 | ||
| 1945 | |||
| 1946-1947 | DIAPHONE, air; blast 2.5 sec., silent 17.5 sec. | ||
| 1950-1952 | |||
| 1953-1955 | DIAPHONE: 1 blast ev 20s (2.5sbl). | Bell, hand, 3 strokes ev 30s, if diaphone is disabled. | USCG Light List - Vol. I-VI: 115 |
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 119 | ||
| 1961 | USCG Light List - Vol. I: 119 | ||
| 1963-1965 | None | ||
| 1966 | HORN, diaphragm; 1 blast ev 20s (2sbl). | USCG Light List - Vol. I: 228 | |
| 1969-1970 | |||
| 1971-1972 | HORN, diaphragm; 1 blast ev 15s (2sbl). | ||
| 1973-1975 | HORN, 1 blast ev 15s (2sbl). | ||
| 1976-1979 | HORN: 1 blast ev 15s (2sbl). | ||
| 1982 | HORN: 1 blast ev 15s (2s bl). | ||
| 1987 | HORN: 1 blast ev 15s (2s bl). | USCG Light List - Vol. I: 2450 | |
| 1990-1992 | USCG Light List - Vol. I: 2245 | ||
| 1993-1996 | USCG Light List - Vol. I: 2295 | ||
| 2004 | HORN: 1 blast ev 15s (2s bl). |
Historical Light List Other Signals
| 1927 | None | USLHS Light List (Atlantic): 24 |
| 1931 | ||
| 1935 | USLHS Light List (Atlantic): 27 | |
| 1940 | USCG Light List (Atlantic): 30 | |
| 1943 | USCG Light List (Atlantic): 32 | |
| 1945-1947 | ||
| 1950-1952 | ||
| 1953-1955 | USCG Light List - Vol. I-VI: 115 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 119 | |
| 1961 | USCG Light List - Vol. I: 119 | |
| 1963-1965 | ||
| 1966 | USCG Light List - Vol. I: 228 | |
| 1969-1977 | ||
| 1978 | RBN: 286 kHz (   ) V. |
|
| 1979 | RBN: 286 kHz GD () V. |
|
| 1982 | ||
| 1987 | USCG Light List - Vol. I: 2450 | |
| 1990 | RBN: 286 kHz GD ()V. |
USCG Light List - Vol. I: 2245 |
| 1991 | 286 kHz, V. GD (). |
|
| 1992 | FREQ: 286 kHz, V. GD (). |
|
| 1993 | FREQ: 293 kHz. GD (). |
USCG Light List - Vol. I: 2295 |
| 1994-1996 | None | |
| 2004 |
 |
1890 - Present |