Isle au Haut (Maine)
Historical Light List Characteristics
| 1908 | F WR. W121/3, R121/3. Red sector between 50° 30' (NE 1/2 E) and 112° 30' (ESE). | LHB Light List (Atlantic): 25 |
| 1915 | F WR. W12, R9. W034°-060°(26°), R060°-034°(334°). | USLHS Light List (Atlantic): 29 |
| 1917 | USLHS Light List (Atlantic): 31 | |
| 1920 | ||
| 1927 | USLHS Light List (Atlantic): 32 | |
| 1931 | ||
| 1935 | Fl WR 3s. W12, R9. fl 0.3. W034°-060°(26°), R060°-034°(334°). | USLHS Light List (Atlantic): 33 |
| 1940 | Fl WR 4s. W9, R7. fl 0.4. W034°-060°(26°), R060°-034°(334°). | USCG Light List (Atlantic): 37 |
| 1943 | USCG Light List (Atlantic): 42 | |
| 1945-1947 | ||
| 1950-1952 | ||
| 1953-1955 | USCG Light List - Vol. I-VI: 131 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 135 | |
| 1961 | USCG Light List - Vol. I: 135 | |
| 1963-1965 | ||
| 1966 | Fl WR 4s. W9, R7. W034°-060°(26°), R060°-034°(334°). | USCG Light List - Vol. I: 245 |
| 1969-1972 | Fl WR 4s. W12, R12. W034°-060°(26°), R060°-034°(334°). | |
| 1973-1979 | Fl WR 4s. W7, R5. W034°-060°(26°), R060°-034°(334°). | |
| 1982 | Fl WR 4s. W8, R6. W034°-060°(26°), R060°-034°(334°). | |
| 1987 | USCG Light List - Vol. I: 3480 | |
| 1990-1992 | USCG Light List - Vol. I: 3280 | |
| 1993-1996 | USCG Light List - Vol. I: 3360 | |
| 2004 |
Historical Light List Optics and Structures
| 1908 | 4th | 45 | 48 | Tower, lower 24 feet conical, gray-granite, upper 16 feet cylindrical, white, brick, connected to shore by wooden bridge; white boathouse 400 feet E'ly, white oilhouse 470 feet, white dwelling 180 feet, and white fuelhouse 250 feet ESE'ly from tower. | LHB Light List (Atlantic): 25 |
| 1915 | N/A | 50 | Tower, lower part conical, gray; upper part cylindrical, white, brick; white bridge to shore. | USLHS Light List (Atlantic): 29 | |
| 1917 | 49 | USLHS Light List (Atlantic): 31 | |||
| 1920 | |||||
| 1927 | USLHS Light List (Atlantic): 32 | ||||
| 1931 | 4 o | ||||
| 1935 | 300 mm a | USLHS Light List (Atlantic): 33 | |||
| 1940 | 5 a | N/A | USCG Light List (Atlantic): 37 | ||
| 1943 | USCG Light List (Atlantic): 42 | ||||
| 1945-1947 | |||||
| 1950-1952 | |||||
| 1953-1955 | N/A | USCG Light List - Vol. I-VI: 131 | |||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 135 | ||||
| 1961 | USCG Light List - Vol. I: 135 | ||||
| 1963-1965 | |||||
| 1966 | USCG Light List - Vol. I: 245 | ||||
| 1969-1979 | |||||
| 1982 | |||||
| 1987 | Tower, lower part conical, gray; upper part cylindrical, white brick; white bridge to shore. | USCG Light List - Vol. I: 3480 | |||
| 1990-1992 | USCG Light List - Vol. I: 3280 | ||||
| 1993-1996 | USCG Light List - Vol. I: 3360 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1908 | Bell struck by machinery a single and a double blow alternately, intervals 20 sec. | None | LHB Light List (Atlantic): 25 |
| 1915 | Bell; 1 stroke, silent 30 sec., 2 strokes, silent 30 sec. | USLHS Light List (Atlantic): 29 | |
| 1917 | Bell; 1 stroke, silent 30 sec., gp. 2 strokes, silent 30 sec. | USLHS Light List (Atlantic): 31 | |
| 1920 | Bell; 1 stroke, silent 30 sec.,gp. 2 strokes, silent 30 sec. | ||
| 1927 | Bell (1,300-lb.); 1 stroke, silent 30 sec.,gp. 2 strokes, silent 30 sec. | USLHS Light List (Atlantic): 32 | |
| 1931 | BELL; 1 stroke, silent 30 sec., gp. 2 strokes, silent 30 sec. | ||
| 1935 | None | USLHS Light List (Atlantic): 33 | |
| 1940 | USCG Light List (Atlantic): 37 | ||
| 1943 | USCG Light List (Atlantic): 42 | ||
| 1945-1947 | |||
| 1950-1952 | |||
| 1953-1955 | USCG Light List - Vol. I-VI: 131 | ||
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 135 | ||
| 1961 | USCG Light List - Vol. I: 135 | ||
| 1963-1965 | |||
| 1966 | USCG Light List - Vol. I: 245 | ||
| 1969-1979 | |||
| 1982 | |||
| 1987 | USCG Light List - Vol. I: 3480 | ||
| 1990-1992 | USCG Light List - Vol. I: 3280 | ||
| 1993-1996 | USCG Light List - Vol. I: 3360 | ||
| 2004 |
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1907 - Present |