Libby Island (Maine)
Historical Light List Characteristics
| 1839 | F W. W15. | USLHE Light List (US): 10 |
| 1849 | ||
| 1858 | F W. W13. | LHB Light List (US): 5 |
| 1860 | LHB Light List (US): 3 | |
| 1865-1866 | LHB Light List (All Coasts): 3 | |
| 1868 | ||
| 1870 | F W. W12. | LHB Light List (All Coasts): 4 |
| 1878-1879 | LHB Light List (All Coasts): 5 | |
| 1886 | ||
| 1888 | LHB Light List (All Coasts): 6 | |
| 1893 | F W. W151/4. | LHB Light List (Atlantic): 7 |
| 1898-1899 | ||
| 1905 | ||
| 1908 | ||
| 1915 | F W. W15. | USLHS Light List (Atlantic): 7 |
| 1917 | USLHS Light List (Atlantic): 8 | |
| 1920 | ||
| 1927 | ||
| 1931 | ||
| 1935 | USLHS Light List (Atlantic): 9 | |
| 1940 | USCG Light List (Atlantic): 11 | |
| 1943 | F W. W13. | USCG Light List (Atlantic): 15 |
| 1945 | ||
| 1946-1947 | F W. W15. | |
| 1950-1952 | ||
| 1953-1955 | USCG Light List - Vol. I-VI: 96 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 97 | |
| 1961 | F W. W15. Obscured 208°-220°(12°). | USCG Light List - Vol. I: 97 |
| 1963-1965 | ||
| 1966 | USCG Light List - Vol. I: 206 | |
| 1969-1972 | ||
| 1973-1974 | F W. W16. Obscured 208°-220°(12°). | |
| 1975-1979 | Fl(2) W 20s. W25. Obscured 208°-220°(12°). | |
| 1982 | ||
| 1987 | USCG Light List - Vol. I: 1295 | |
| 1990-1992 | USCG Light List - Vol. I: 1090 | |
| 1993-1996 | USCG Light List - Vol. I: 1120 | |
| 2004 | Fl(2) W 20s. W18. |
Historical Light List Optics and Structures
| 1839 | 10 Lamps / 15" Refl. | 30 | 60 | N/A | USLHE Light List (US): 10 |
| 1849 | 12 Lamps / 16" Refl. | ||||
| 1858 | 4th | 35 | 52 | LHB Light List (US): 5 | |
| 1860 | LHB Light List (US): 3 | ||||
| 1865 | LHB Light List (All Coasts): 3 | ||||
| 1866 | |||||
| 1868 | |||||
| 1870 | Tower is granite, detached from keeper's dwelling, and about 250 feet distant from the later, which is a story and a half house, painted brown. | LHB Light List (All Coasts): 4 | |||
| 1878-1879 | Tower of granite, natural color, standing about south of dwelling. Dwelling a one and a half story house, painted brown. | LHB Light List (All Coasts): 5 | |||
| 1886 | Gray- granite tower, detached from white dwelling. Fog-signal house on S. point of island. | ||||
| 1888 | Gray granite tower, detached from white dwelling. Fog-signal house on S. point of island. | LHB Light List (All Coasts): 6 | |||
| 1893 | 36 | 91 | LHB Light List (Atlantic): 7 | ||
| 1898 | |||||
| 1899 | Conical gray granite tower, detached from white dwelling and rain shed. White fog-signal house on S. point of island, and a red brick oil house about 100 feet N. of tower. | ||||
| 1905 | White, conical, granite tower, black lantern; rain shed and red-brick oilhouse about 100 feet, and white dwelling 225 feet northerly from the light-tower. White fog-signal house on southerly point of island. | ||||
| 1908 | White, conical, granite tower, black lantern; rainshed and red-brick oilhouse about 100 feet and white dwelling 225 feet N'ly from the light-tower; white fog-signal house on S'ly point of island. | ||||
| 1915 | N/A | 40 | White; conical, granite tower. | USLHS Light List (Atlantic): 7 | |
| 1917 | 42 | White conical granite tower. | USLHS Light List (Atlantic): 8 | ||
| 1920 | |||||
| 1927 | |||||
| 1931 | 4 iov | White granite conical tower. | |||
| 1935 | USLHS Light List (Atlantic): 9 | ||||
| 1940 | USCG Light List (Atlantic): 11 | ||||
| 1943 | USCG Light List (Atlantic): 15 | ||||
| 1945-1947 | |||||
| 1950-1952 | 4 e | ||||
| 1953-1955 | N/A | USCG Light List - Vol. I-VI: 96 | |||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 97 | ||||
| 1961 | USCG Light List - Vol. I: 97 | ||||
| 1963-1965 | |||||
| 1966 | USCG Light List - Vol. I: 206 | ||||
| 1969-1979 | Granite conical tower. | ||||
| 1982 | |||||
| 1987 | USCG Light List - Vol. I: 1295 | ||||
| 1990-1992 | USCG Light List - Vol. I: 1090 | ||||
| 1993-1996 | USCG Light List - Vol. I: 1120 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1858 | Fog-bell | None | LHB Light List (US): 5 |
| 1860 | LHB Light List (US): 3 | ||
| 1865-1866 | Fog-bell struck by machinery. | LHB Light List (All Coasts): 3 | |
| 1868 | |||
| 1870 | A bell struck by machinery. | LHB Light List (All Coasts): 4 | |
| 1878-1879 | LHB Light List (All Coasts): 5 | ||
| 1886 | 3d-class Daboll trumpet; blasts 7 sec., intervals 40 sec. | If Daboll trumpet be disabled, a bell will be struck by machinery every 10 seconds. | |
| 1888 | 3d-class Daboll trumpet; blasts 7 sec, intervals 40 sec. | If Daboll trumpet be disabled, a bell will be struck by hand. | LHB Light List (All Coasts): 6 |
| 1893 | 10-inch steam whistle; blasts 4 sec., alternate silent intervals of 4 sec. and 18 sec. | None | LHB Light List (Atlantic): 7 |
| 1898 | 10-inch steam whistle; blasts 2 sec., silent intervals 13 sec. | ||
| 1899 | 10-inch steam whistle; blasts 5 sec., silent intervals 25 sec. | ||
| 1905 | 10-inch steam whistle; blasts 2 sec., silent intervals 13 sec. | If whistle be disabled a bell will be rung by hand. | |
| 1908 | |||
| 1915 | 10-inch steam whistle; blast 2 sec., silent 13 sec. | Bell (hand) if whistle is disabled. | USLHS Light List (Atlantic): 7 |
| 1917 | USLHS Light List (Atlantic): 8 | ||
| 1920 | |||
| 1927 | Air diaphone; blast 2 sec., silent 13 sec. | Bell (1,300-lb.) if whistle is disabled. | |
| 1931 | DIAPHONE, air; blast 2 sec., silent 13 sec. | Bell if diaphone disabled. | |
| 1935 | USLHS Light List (Atlantic): 9 | ||
| 1940 | USCG Light List (Atlantic): 11 | ||
| 1943 | USCG Light List (Atlantic): 15 | ||
| 1945-1947 | |||
| 1950-1952 | |||
| 1953-1955 | DIAPHONE: 1 blast ev 15s (2sbl). | Bell, hand, gp of 2 strokes ev 30s, if diaphone is disabled. | USCG Light List - Vol. I-VI: 96 |
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 97 | ||
| 1961 | USCG Light List - Vol. I: 97 | ||
| 1963 | |||
| 1964-1965 | None | ||
| 1966 | USCG Light List - Vol. I: 206 | ||
| 1969-1972 | 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: 1295 | |
| 1990-1992 | USCG Light List - Vol. I: 1090 | ||
| 1993-1996 | USCG Light List - Vol. I: 1120 | ||
| 2004 | HORN: 1 blast ev 15s (2s bl). |
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1822 - Present |