Butler Flats (Massachusetts)
Historical Light List Characteristics
| 1898 | Fl W 5s. W123/4. | LHB Light List (Atlantic): 166 |
| 1899 | LHB Light List (Atlantic): 170 | |
| 1905 | LHB Light List (Atlantic): 184 | |
| 1908 | LHB Light List (Atlantic): 196 | |
| 1915 | Fl W 5s. W13. fl 0.7. | USLHS Light List (Atlantic): 249 |
| 1917 | USLHS Light List (Atlantic): 258 | |
| 1920 | USLHS Light List (Atlantic): 266 | |
| 1927 | USLHS Light List (Atlantic): 263 | |
| 1931 | Fl W 5s. W13. fl 1. | USLHS Light List (Atlantic): 307 |
| 1935 | USLHS Light List (Atlantic): 341 | |
| 1940 | USCG Light List (Atlantic): 335 | |
| 1943 | USCG Light List (Atlantic): 418 | |
| 1945-1947 | ||
| 1950-1952 | ||
| 1953-1955 | USCG Light List - Vol. I-VI: 482 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 519 | |
| 1961 | USCG Light List - Vol. I: 519 | |
| 1963-1965 | Fl W 5s. W13. fl 1.2. | |
| 1966 | USCG Light List - Vol. I: 683 | |
| 1969-1972 | ||
| 1973-1978 | Fl W 5s. W16. fl 1.2. | |
| 1979 | Fl W 4s. W4. | USCG Light List - Vol. I: 683.3 |
| 1982 | ||
| 1987 | USCG Light List - Vol. I: 15580 | |
| 1990-1992 | USCG Light List - Vol. I: 15355 | |
| 1993-1995 | USCG Light List - Vol. I: 16785 | |
| 1996 | Fl W 4s. | USCG Light List - Vol. I: 16853 |
| 2004 |
Historical Light List Optics and Structures
| 1898 | 5th | N/A | 53 | Black cylindrical foundation surmounted by a conical red brick tower with a brown watchroom and black lantern. A gallery with roof surrounds the base of the tower. | LHB Light List (Atlantic): 166 |
| 1899 | Black cylindrical foundation surmounted by a conical, white, brick tower with a brown watchroom and black lantern. A white gallery with roof surrounds the base of the tower. | LHB Light List (Atlantic): 170 | |||
| 1905 | Black cylindrical foundation surmounted by a white, conical, red brick tower with a brown watchroom and black lantern. A white gallery with roof surrounds the base of the tower. | LHB Light List (Atlantic): 184 | |||
| 1908 | Black cylindrical foundation surmounted by a white, conical, brick tower with a brown watchroom and black lantern; white gallery with roof surrounds the base of the tower. | LHB Light List (Atlantic): 196 | |||
| 1915 | N/A | White; conical; brick tower on black, cylindrical pier. | USLHS Light List (Atlantic): 249 | ||
| 1917 | White conical tower, on black cylindrical pier. | USLHS Light List (Atlantic): 258 | |||
| 1920 | USLHS Light List (Atlantic): 266 | ||||
| 1927 | USLHS Light List (Atlantic): 263 | ||||
| 1931 | 5 o | White conical on black cylindrical pier. | USLHS Light List (Atlantic): 307 | ||
| 1935 | 5 iov | USLHS Light List (Atlantic): 341 | |||
| 1940 | USCG Light List (Atlantic): 335 | ||||
| 1943 | USCG Light List (Atlantic): 418 | ||||
| 1945 | 5 e | ||||
| 1946-1947 | White conical tower on black cylindrical pier. | ||||
| 1950-1952 | |||||
| 1953-1955 | N/A | USCG Light List - Vol. I-VI: 482 | |||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 519 | ||||
| 1961 | USCG Light List - Vol. I: 519 | ||||
| 1963-1965 | |||||
| 1966 | USCG Light List - Vol. I: 683 | ||||
| 1969-1978 | |||||
| 1979 | White conical tower on black cylindrical base. | USCG Light List - Vol. I: 683.3 | |||
| 1982 | |||||
| 1987 | USCG Light List - Vol. I: 15580 | ||||
| 1990-1992 | USCG Light List - Vol. I: 15355 | ||||
| 1993-1995 | USCG Light List - Vol. I: 16785 | ||||
| 1996 | USCG Light List - Vol. I: 16853 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1898 | A 4,000-pound bell struck by machinery a double blow every 15 sec. | None | LHB Light List (Atlantic): 166 |
| 1899 | Bell struck by machinery a double blow every 15 sec. | LHB Light List (Atlantic): 170 | |
| 1905 | LHB Light List (Atlantic): 184 | ||
| 1908 | LHB Light List (Atlantic): 196 | ||
| 1915 | Bell; 2 strokes every 15 sec. | USLHS Light List (Atlantic): 249 | |
| 1917 | Bell; gp. 2 strokes every 15 sec. | USLHS Light List (Atlantic): 258 | |
| 1920 | USLHS Light List (Atlantic): 266 | ||
| 1927 | USLHS Light List (Atlantic): 263 | ||
| 1931 | BELL; gp. 2 strokes every 15 sec. | USLHS Light List (Atlantic): 307 | |
| 1935 | USLHS Light List (Atlantic): 341 | ||
| 1940 | BELL; group of 2 strokes every 15 sec. | USCG Light List (Atlantic): 335 | |
| 1943 | HORN, diaphragm, air; blast 3 sec., silent 12 sec. | Bell, if horn is disabled, 2 strokes every 15 sec. | USCG Light List (Atlantic): 418 |
| 1945-1947 | |||
| 1950-1952 | |||
| 1953-1955 | HORN, diaphragm: 1 blast ev 15s (3sbl). | Bell, gp of 2 strokes ev 15s, if horn is disabled. | USCG Light List - Vol. I-VI: 482 |
| 1957 | None | ||
| 1959-1960 | USCG Light List - Vol. I-V: 519 | ||
| 1961 | USCG Light List - Vol. I: 519 | ||
| 1963-1965 | |||
| 1966 | HORN, diaphragm; 1 blast ev 15s (3sbl). | USCG Light List - Vol. I: 683 | |
| 1969 | |||
| 1970-1972 | HORN, diaphragm; 1 blast ev 15s (2sbl). | ||
| 1973-1975 | HORN, 1 blast ev 15s (2sbl). | ||
| 1976-1978 | HORN: 1 blast ev 15s (2sbl). | ||
| 1979 | None | USCG Light List - Vol. I: 683.3 | |
| 1982 | |||
| 1987 | USCG Light List - Vol. I: 15580 | ||
| 1990-1992 | USCG Light List - Vol. I: 15355 | ||
| 1993-1995 | USCG Light List - Vol. I: 16785 | ||
| 1996 | USCG Light List - Vol. I: 16853 | ||
| 2004 |
Historical Light List Other Signals
| 1927 | None | USLHS Light List (Atlantic): 263 |
| 1931 | USLHS Light List (Atlantic): 307 | |
| 1935 | USLHS Light List (Atlantic): 341 | |
| 1940 | USCG Light List (Atlantic): 335 | |
| 1943 | USCG Light List (Atlantic): 418 | |
| 1945-1946 | ||
| 1947 | RADIOBEACON: Transmit on 296 kc., a group of 0.5 sec. dashes for 15.5 sec., silent 14.5 sec. Antenna lead-in at east side of light tower. | |
| 1950-1952 | ||
| 1953-1955 | MARKER RADIOBEACON: 296 kc (a gp of 0.5s dashes for 15.5s si 14.5s). Antenna at east side of light tower. | USCG Light List - Vol. I-VI: 482 |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 519 | |
| 1961 | USCG Light List - Vol. I: 519 | |
| 1963 | MARKER RADIOBEACON: Antenna at east side of light tower. | |
| 1964 | MARKER RADIOBEACON: 324 kc (a gp of 0.5s dashes for 13.5s si 1.5s). Antenna at east side of light tower. | |
| 1965 | MARKER RADIOBEACON: 319 kc (a gp of 0.5s dashes for 13.5s si 1.5s). Antenna at east side of light tower. | |
| 1966 | MARKER RADIOBEACON: Antenna at east side of light tower. | USCG Light List - Vol. I: 683 |
| 1969-1974 | RADIOBEACON: 324 kc (Code:  ). Antenna at east side of light tower. |
|
| 1975-1977 | RBN: 324 kHz () II. Antenna at east side of light tower. |
|
| 1978 | RBN: 322 kHz (). Antenna at east side of light tower. |
|
| 1979 | None | USCG Light List - Vol. I: 683.3 |
| 1982 | ||
| 1987 | USCG Light List - Vol. I: 15580 | |
| 1990-1992 | USCG Light List - Vol. I: 15355 | |
| 1993-1995 | USCG Light List - Vol. I: 16785 | |
| 1996 | USCG Light List - Vol. I: 16853 | |
| 2004 |
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1898 - Present |