Great Shoals (Maryland)
Historical Light List Characteristics
| 1886 | F W. W111/2. | LHB Light List (All Coasts): 343 |
| 1888 | LHB Light List (All Coasts): 360 | |
| 1893 | F W. W111/4. | LHB Light List (Atlantic): 471 |
| 1898 | LHB Light List (Atlantic): 567 | |
| 1899 | LHB Light List (Atlantic): 582 | |
| 1905 | LHB Light List (Atlantic): 676 | |
| 1908 | LHB Light List (Atlantic): 733 | |
| 1915 | F W. | USLHS Light List (Atlantic): 1014 |
| 1917 | USLHS Light List (Atlantic): 1050 | |
| 1920 | USLHS Light List (Atlantic): 1102 | |
| 1927 | USLHS Light List (Atlantic): 1188 | |
| 1931 | USLHS Light List (Atlantic): 1513 | |
| 1935 | USLHS Light List (Atlantic): 1876 | |
| 1943 | USCG Light List (Atlantic): 2442 | |
| 1945-1947 | ||
| 1950-1951 | ||
| 1952 | Fl W 6s. fl 1. | |
| 1953-1955 | Fl W 6s. W11. fl 1. | USCG Light List - Vol. I-VI: 2901 |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 3392 | |
| 1961 | USCG Light List - Vol. I: 3392 | |
| 1963 | ||
| 1965 | ||
| 1966 | Fl W 6s. fl 1. | USCG Light List - Vol. I: 3726 |
| 1969-1970 | Fl W 6s. fl 1. | USCG Light List - Vol. I: 3726 |
| 1972 | ||
| 1973-1974 | Fl W 6s. W9. | |
| 1976 | ||
| 1978 | ||
| 1982 | ||
| 1987 | Fl W 6s. W8. | USCG Light List - Vol. II: 17690 |
| 1990-1992 | USCG Light List - Vol. II: 21790 | |
| 1993-1996 | USCG Light List - Vol. II: 23700 | |
| 2004 |
Historical Light List Optics and Structures
| 1886 | 5th | N/A | 39 | Square white screw-pile structure; piles and roof, brown; lantern, red. Stands in 5 feet water. | LHB Light List (All Coasts): 343 |
| 1888 | Square white screw-pile structure; piles and roof, brown; lantern, black. Stands in 5 feet water. | LHB Light List (All Coasts): 360 | |||
| 1893 | 37 | White square screw-pile structure; piles and roof, brown; lantern, black. Stands in 5 feet at mean low water. | LHB Light List (Atlantic): 471 | ||
| 1898 | White square, screw-pile structure; piles and roof, brown; lantern, black. In 5 feet of water. | LHB Light List (Atlantic): 567 | |||
| 1899 | LHB Light List (Atlantic): 582 | ||||
| 1905 | White, square, screw-pile structure; piles and roof, brown; lantern, black. In 5 feet of water. | LHB Light List (Atlantic): 676 | |||
| 1908 | White, square, screw-pile structure; brown piles and roof; black lantern. In 5 feet of water. | LHB Light List (Atlantic): 733 | |||
| 1915 | N/A | White; square; on brown piles. In 3/4 fathom. | USLHS Light List (Atlantic): 1014 | ||
| 1917 | USLHS Light List (Atlantic): 1050 | ||||
| 1920 | White, square; on brown piles. In 3/4 fathom. | USLHS Light List (Atlantic): 1102 | |||
| 1927 | USLHS Light List (Atlantic): 1188 | ||||
| 1931 | 5 o | White square on brown piles. In 4 feet. | USLHS Light List (Atlantic): 1513 | ||
| 1935 | USLHS Light List (Atlantic): 1876 | ||||
| 1943 | 5 iov | USCG Light List (Atlantic): 2442 | |||
| 1945-1947 | |||||
| 1950-1951 | |||||
| 1952 | 4 e | ||||
| 1953-1955 | N/A | White square tower on brown piles. In 4 feet. | USCG Light List - Vol. I-VI: 2901 | ||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 3392 | ||||
| 1961 | USCG Light List - Vol. I: 3392 | ||||
| 1963 | |||||
| 1965 | |||||
| 1966 | USCG Light List - Vol. I: 3726 | ||||
| 1969-1970 | N/A | N/A | 37 | White and red checkered daymark on white skeleton tower on piles. In 4 feet. | USCG Light List - Vol. I: 3726 |
| 1972-1974 | NR on white skeleton tower on piles. In 4 feet. | ||||
| 1976 | |||||
| 1978 | |||||
| 1982 | |||||
| 1987 | NR on white skeleton tower on piles. | USCG Light List - Vol. II: 17690 | |||
| 1990 | USCG Light List - Vol. II: 21790 | ||||
| 1991-1992 | NB on white skeleton tower on piles. | ||||
| 1993-1996 | USCG Light List - Vol. II: 23700 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1886 | Bell struck by machinery every 15 sec. | None | LHB Light List (All Coasts): 343 |
| 1888 | LHB Light List (All Coasts): 360 | ||
| 1893 | LHB Light List (Atlantic): 471 | ||
| 1898 | LHB Light List (Atlantic): 567 | ||
| 1899 | LHB Light List (Atlantic): 582 | ||
| 1905 | LHB Light List (Atlantic): 676 | ||
| 1908 | Bell struck by machinery a single blow every 15 sec. | LHB Light List (Atlantic): 733 | |
| 1915 | Bell; 1 stroke every 15 sec. | USLHS Light List (Atlantic): 1014 | |
| 1917 | USLHS Light List (Atlantic): 1050 | ||
| 1920 | USLHS Light List (Atlantic): 1102 | ||
| 1927 | USLHS Light List (Atlantic): 1188 | ||
| 1931 | BELL; 1 stroke every 15 sec. | USLHS Light List (Atlantic): 1513 | |
| 1935 | USLHS Light List (Atlantic): 1876 | ||
| 1943 | USCG Light List (Atlantic): 2442 | ||
| 1945-1947 | |||
| 1950-1951 | |||
| 1952 | BELL, electric; 1 stroke every 15 sec. | ||
| 1953-1955 | BELL: 1 stroke ev 15s. | USCG Light List - Vol. I-VI: 2901 | |
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 3392 | ||
| 1961 | USCG Light List - Vol. I: 3392 | ||
| 1963 | |||
| 1965 | |||
| 1966 | USCG Light List - Vol. I: 3726 | ||
| 1969-1970 | |||
| 1972-1974 | |||
| 1976 | |||
| 1978 | |||
| 1982 | BELL: 1 stroke ev 15s. | ||
| 1987 | BELL: 1 stroke ev 15s. | USCG Light List - Vol. II: 17690 | |
| 1990-1992 | USCG Light List - Vol. II: 21790 | ||
| 1993-1996 | USCG Light List - Vol. II: 23700 | ||
| 2004 | BELL: 1 stroke ev 15s. |
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1884 - Present (Modern light was built on the foundation of the original lighthouse.) |