Seven Foot Knoll (Maryland)
Historical Light List Characteristics
| 1858 | F W. W11. | LHB Light List (US): 236 |
| 1860 | LHB Light List (US): 221 | |
| 1865-1866 | LHB Light List (All Coasts): 225 | |
| 1868 | LHB Light List (All Coasts): 228 | |
| 1870 | F W. W12. | LHB Light List (All Coasts): 239 |
| 1878 | F R. R12. | LHB Light List (All Coasts): 307 |
| 1879 | LHB Light List (All Coasts): 311 | |
| 1886 | F R. R111/4. | LHB Light List (All Coasts): 358 |
| 1888 | LHB Light List (All Coasts): 375 | |
| 1893 | LHB Light List (Atlantic): 485 | |
| 1898 | LHB Light List (Atlantic): 587 | |
| 1899 | LHB Light List (Atlantic): 605 | |
| 1905 | LHB Light List (Atlantic): 699 | |
| 1908 | F WR. W111/4, R111/4. R1391/2°-3501/2°(211°), W3501/2°-1391/2°(149°). | LHB Light List (Atlantic): 758 |
| 1915 | F WR. W12, R9. R134°-344°(210°), W344°-134°(150°). | USLHS Light List (Atlantic): 1066 |
| 1917 | USLHS Light List (Atlantic): 1101 | |
| 1920 | USLHS Light List (Atlantic): 1153 | |
| 1927 | F WR. W12, R9. R134°-266°(132°), W266°-271°(5°), R271°-344°(73°), W344°-134°(150°). | USLHS Light List (Atlantic): 1254 |
| 1931 | USLHS Light List (Atlantic): 1210 | |
| 1935 | USLHS Light List (Atlantic): 1479 | |
| 1943 | USCG Light List (Atlantic): 1930 | |
| 1945-1947 | ||
| 1950-1952 | Fl WR 6s. W11, R8. fl 2. R134°-344°(210°), W344°-134°(150°). | |
| 1953-1955 | Fl WR 6s. W11, R7. fl 2. R134°-344°(210°), W344°-134°(150°). | USCG Light List - Vol. I-VI: 2111 |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 2499 | |
| 1961 | USCG Light List - Vol. I: 2499 | |
| 1963 | Fl WR 2.5s. W11, R7. fl 0.5. R134°-344°(210°), W344°-134°(150°). | |
| 1965 | ||
| 1966 | Fl WR 2.5s. W12, R12. R134°-344°(210°), W344°-134°(150°). | USCG Light List - Vol. I: 2777 |
| 1969-1970 | ||
| 1972 | ||
| 1973-1974 | Fl WR 2.5s. W6, R6. R134°-344°(210°), W344°-134°(150°). | |
| 1976 | ||
| 1978 | Fl WR 6s. W6, R6. R134°-344°(210°), W344°-134°(150°). | |
| 1982 | Fl WR 6s. W9, R7. R134°-344°(210°), W344°-134°(150°). | |
| 1987 | USCG Light List - Vol. II: 3340 | |
| 1990 | Fl WR 6s. W9, R7. R134°-344°(210°), W344°-134°(150°). | USCG Light List - Vol. II: 7455 |
| 1991-1992 | USCG Light List - Vol. II: 7475 | |
| 1993-1996 | USCG Light List - Vol. II: 8120 | |
| 2004 |
Historical Light List Optics and Structures
| 1858 | 4th | N/A | 43 | Iron screw pile structure; black with white window shutters. | LHB Light List (US): 236 |
| 1860 | Iron screw pile structure; black, with white window shutters. | LHB Light List (US): 221 | |||
| 1865 | Iron screw-pile structure; black, with white window-shutters. | LHB Light List (All Coasts): 225 | |||
| 1866 | Iron screw-pile structure; black, with white window shutters. | ||||
| 1868 | LHB Light List (All Coasts): 228 | ||||
| 1870 | LHB Light List (All Coasts): 239 | ||||
| 1878 | An octagonal screw-pile structure; black, with white window-shutters; stands on 9 piles. | LHB Light List (All Coasts): 307 | |||
| 1879 | LHB Light List (All Coasts): 311 | ||||
| 1886 | 43 | Black octagonal screw-pile structure, with white window-shutters. | LHB Light List (All Coasts): 358 | ||
| 1888 | Brown octagonal screw-pile structure, with green window-shutters. | LHB Light List (All Coasts): 375 | |||
| 1893 | N/A | 42 | Brown octagonal screw-pile structure, with green window shutters. | LHB Light List (Atlantic): 485 | |
| 1898 | LHB Light List (Atlantic): 587 | ||||
| 1899 | LHB Light List (Atlantic): 605 | ||||
| 1905 | LHB Light List (Atlantic): 699 | ||||
| 1908 | Brown, octagonal, screw-pile structure, with green window shutters. | LHB Light List (Atlantic): 758 | |||
| 1915 | N/A | Brown; octagonal pile structure. | USLHS Light List (Atlantic): 1066 | ||
| 1917 | USLHS Light List (Atlantic): 1101 | ||||
| 1920 | USLHS Light List (Atlantic): 1153 | ||||
| 1927 | USLHS Light List (Atlantic): 1254 | ||||
| 1931 | 4 iov | Red octagonal pile structure. | USLHS Light List (Atlantic): 1210 | ||
| 1935 | USLHS Light List (Atlantic): 1479 | ||||
| 1943 | Red cylindrical pile structure. | USCG Light List (Atlantic): 1930 | |||
| 1945-1947 | |||||
| 1950-1952 | 300 mm e | ||||
| 1953-1955 | N/A | USCG Light List - Vol. I-VI: 2111 | |||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 2499 | ||||
| 1961 | USCG Light List - Vol. I: 2499 | ||||
| 1963 | |||||
| 1965 | |||||
| 1966 | USCG Light List - Vol. I: 2777 | ||||
| 1969-1970 | |||||
| 1972-1974 | Red cylindrical pile structure. In 8 feet. | ||||
| 1976 | |||||
| 1978 | |||||
| 1982 | |||||
| 1987 | Red cylindrical pile structure. | USCG Light List - Vol. II: 3340 | |||
| 1990 | N/A | N/A | 58 | On skeleton tower. | USCG Light List - Vol. II: 7455 |
| 1991-1992 | USCG Light List - Vol. II: 7475 | ||||
| 1993-1996 | USCG Light List - Vol. II: 8120 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1858 | Fog-bell struck by machinery. | None | LHB Light List (US): 236 |
| 1860 | Fog-bell struck by machinery, and fog-horn sounded every five minutes in foggy weather. | LHB Light List (US): 221 | |
| 1865-1866 | LHB Light List (All Coasts): 225 | ||
| 1868 | LHB Light List (All Coasts): 228 | ||
| 1870 | A bell struck by machinery and a horn. | LHB Light List (All Coasts): 239 | |
| 1878 | A bell, struck by machinery, at intervals of 12 seconds. | LHB Light List (All Coasts): 307 | |
| 1879 | LHB Light List (All Coasts): 311 | ||
| 1886 | Bell struck by machinery every 12 sec. | LHB Light List (All Coasts): 358 | |
| 1888 | LHB Light List (All Coasts): 375 | ||
| 1893 | LHB Light List (Atlantic): 485 | ||
| 1898 | LHB Light List (Atlantic): 587 | ||
| 1899 | LHB Light List (Atlantic): 605 | ||
| 1905 | LHB Light List (Atlantic): 699 | ||
| 1908 | Bell struck by machinery a single blow every 12 sec. | LHB Light List (Atlantic): 758 | |
| 1915 | Bell; 1 stroke every 12 sec. | USLHS Light List (Atlantic): 1066 | |
| 1917 | USLHS Light List (Atlantic): 1101 | ||
| 1920 | USLHS Light List (Atlantic): 1153 | ||
| 1927 | USLHS Light List (Atlantic): 1254 | ||
| 1931 | BELL; 1 stroke every 12 sec. | USLHS Light List (Atlantic): 1210 | |
| 1935 | USLHS Light List (Atlantic): 1479 | ||
| 1943 | USCG Light List (Atlantic): 1930 | ||
| 1945-1947 | |||
| 1950-1952 | BELL, electric; 1 stroke every 12 sec. | ||
| 1953-1955 | BELL: 1 stroke ev 12s. | USCG Light List - Vol. I-VI: 2111 | |
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 2499 | ||
| 1961 | USCG Light List - Vol. I: 2499 | ||
| 1963 | |||
| 1965 | |||
| 1966 | USCG Light List - Vol. I: 2777 | ||
| 1969-1970 | BELL: 1 stroke ev 10s. | ||
| 1972-1974 | |||
| 1976 | |||
| 1978 | |||
| 1982 | None | ||
| 1987 | USCG Light List - Vol. II: 3340 | ||
| 1990 | USCG Light List - Vol. II: 7455 | ||
| 1991-1992 | USCG Light List - Vol. II: 7475 | ||
| 1993-1996 | USCG Light List - Vol. II: 8120 | ||
| 2004 |
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1855 - Present |