Sandy Point Shoal (Maryland)
Historical Light List Characteristics
| 1886 | FFl W 90s. F121/2, Fl121/2. | LHB Light List (All Coasts): 354 |
| 1888 | LHB Light List (All Coasts): 371 | |
| 1893 | F WR. W121/2, R121/2. White sector from N. by E. 1/2 E. through eastward to S. 3/8 E. | LHB Light List (Atlantic): 481 |
| 1898 | F WR. W121/2, R121/2. White sector from S. 3/8 E. through eastward to N. by E. 1/2 E. | LHB Light List (Atlantic): 579 |
| 1899 | LHB Light List (Atlantic): 595 | |
| 1905 | LHB Light List (Atlantic): 691 | |
| 1908 | F WR. W121/2, R121/2. R0283/4°-177°(1481/4°), W177°-0283/4°(2113/4°). | LHB Light List (Atlantic): 750 |
| 1915 | F WR. W13, R13. R013°-171°(158°), W171°-013°(202°). | USLHS Light List (Atlantic): 1052 |
| 1917 | USLHS Light List (Atlantic): 1087 | |
| 1920 | USLHS Light List (Atlantic): 1139 | |
| 1927 | USLHS Light List (Atlantic): 1236 | |
| 1931 | Fl(2) WR 10s. W13, R13. fl 1, ec 2, fl 1, ec 6. R013°-171°(158°), W171°-013°(202°). | USLHS Light List (Atlantic): 1197 |
| 1935 | USLHS Light List (Atlantic): 1464 | |
| 1943 | USCG Light List (Atlantic): 1915 | |
| 1945-1947 | ||
| 1950-1952 | ||
| 1953-1955 | USCG Light List - Vol. I-VI: 2096 | |
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 2483 | |
| 1961 | USCG Light List - Vol. I: 2483 | |
| 1963 | ||
| 1965 | Fl(2) W 10s. W13. fl 1, ec 2, fl 1, ec 6. | |
| 1966 | USCG Light List - Vol. I: 2761 | |
| 1969-1970 | ||
| 1972 | Fl W 6s. W12. fl 1. | |
| 1973-1974 | Fl W 6s. W9. | |
| 1976 | ||
| 1978 | ||
| 1982 | ||
| 1987 | USCG Light List - Vol. II: 3240 | |
| 1990-1992 | USCG Light List - Vol. II: 7350 | |
| 1993-1996 | USCG Light List - Vol. II: 7990 | |
| 2004 |
Historical Light List Optics and Structures
| 1886 | 5th | 52 | 52 | Red brick dwelling upon an iron caisson; lantern and caisson painted red. Stands in 13 feet of water. | LHB Light List (All Coasts): 354 |
| 1888 | Red brick dwelling upon a cylindrical iron caisson; lantern, black; caisson, brown. Stands in 13 feet of water. | LHB Light List (All Coasts): 371 | |||
| 1893 | N/A | 51 | Red brick dwelling on brown cylindrical foundation; lantern, black. Stands in 13 feet at mean low water. | LHB Light List (Atlantic): 481 | |
| 1898 | Brown cylindrical foundation; red brick dwelling, green trimmings, roof painted in three white and two black horizontal bands; lantern, black. In 13 feet of water. | LHB Light List (Atlantic): 579 | |||
| 1899 | LHB Light List (Atlantic): 595 | ||||
| 1905 | Brown, cylindrical foundation; red-brick dwelling, green trimmings, roof painted in three white and two black horizontal bands; lantern, black. In 13 feet of water. | LHB Light List (Atlantic): 691 | |||
| 1908 | Brown, cylindrical foundation; red-brick dwelling, green trimmings, roof painted in three white and two black horizontal bands; black lantern. In 13 feet of water. | LHB Light List (Atlantic): 750 | |||
| 1915 | N/A | Brown, cylindrical foundation; red brick dwelling; roof, three white and two black horizontal bands. In 21/4 fathoms. | USLHS Light List (Atlantic): 1052 | ||
| 1917 | USLHS Light List (Atlantic): 1087 | ||||
| 1920 | USLHS Light List (Atlantic): 1139 | ||||
| 1927 | Brown, cylindrical foundation; red brick dwelling; white roof. In 21/4 fathoms. | USLHS Light List (Atlantic): 1236 | |||
| 1931 | 4 ei | Brown, cylindrical foundation; red brick dwelling, white roof. In 13 feet. | USLHS Light List (Atlantic): 1197 | ||
| 1935 | On brown, cylindrical foundation. Red brick dwelling, white roof. In 13 feet. | USLHS Light List (Atlantic): 1464 | |||
| 1943 | 4 e | Red brick dwelling, white roof, on brown, cylindrical foundation. In 13 feet. | USCG Light List (Atlantic): 1915 | ||
| 1945-1947 | |||||
| 1950-1952 | |||||
| 1953-1955 | N/A | Red brick dwelling, white roof on brown cylindrical foundation. In 13 feet. | USCG Light List - Vol. I-VI: 2096 | ||
| 1957 | |||||
| 1959-1960 | USCG Light List - Vol. I-V: 2483 | ||||
| 1961 | USCG Light List - Vol. I: 2483 | ||||
| 1963 | |||||
| 1965 | |||||
| 1966 | USCG Light List - Vol. I: 2761 | ||||
| 1969-1970 | Red brick dwelling, white roof on brown cylindrical foundation. In 7 feet. | ||||
| 1972-1973 | |||||
| 1974 | Red brick dwelling, white roof on brown cylindrical foundation. In 13 feet. | ||||
| 1976 | |||||
| 1978 | Red brick dwelling, white roof on brown cylindrical foundation. In 9 feet. | ||||
| 1982 | |||||
| 1987 | Red brick dwelling, white roof on brown cylindrical foundation. | USCG Light List - Vol. II: 3240 | |||
| 1990-1992 | USCG Light List - Vol. II: 7350 | ||||
| 1993-1996 | USCG Light List - Vol. II: 7990 | ||||
| 2004 |
Historical Light List Audible Fog Signals
| 1886 | Bell struck by machinery every 10 sec. | None | LHB Light List (All Coasts): 354 |
| 1888 | LHB Light List (All Coasts): 371 | ||
| 1893 | LHB Light List (Atlantic): 481 | ||
| 1898 | LHB Light List (Atlantic): 579 | ||
| 1899 | LHB Light List (Atlantic): 595 | ||
| 1905 | LHB Light List (Atlantic): 691 | ||
| 1908 | 3d-class Daboll trumpet; blasts 3 sec., silent intervals 7 sec. | If trumpet be disabled a bell will be struck by machinery a single blow every 10 sec. | LHB Light List (Atlantic): 750 |
| 1915 | 3d-cl. reed horn: blast 3 sec., silent 7 sec. | Bell (hand) if horn is disabled; 1 stroke every 10 sec. | USLHS Light List (Atlantic): 1052 |
| 1917 | USLHS Light List (Atlantic): 1087 | ||
| 1920 | USLHS Light List (Atlantic): 1139 | ||
| 1927 | USLHS Light List (Atlantic): 1236 | ||
| 1931 | HORN, 3d-cl. reed: Blast 3 sec., silent 7 sec. | Bell, hand, if horn is disabled; 1 stroke every 10 sec. | USLHS Light List (Atlantic): 1197 |
| 1935 | WHISTLE, air: Blast 3 sec., silent 12 sec. | Bell, hand, if whistle is disabled; 1 stroke every 10 sec. | USLHS Light List (Atlantic): 1464 |
| 1943 | HORN, diaphragm, air; blast 3 sec., silent 12 sec. | Bell, if horn is disabled; 1 stroke every 10 sec. | USCG Light List (Atlantic): 1915 |
| 1945-1947 | |||
| 1950-1952 | |||
| 1953 | HORN, diaphragm; when operating, are synchronized with radiobeacon ev 3 minutes for distance finding. | Bell, 1 stroke ev 15s if horn is disabled. | USCG Light List - Vol. I-VI: 2096 |
| 1954-1955 | HORN, diaphragm; 1 blast ev 15s (3sbl). | Bell, 1 stroke ev 10s if horn is disabled. | |
| 1957 | |||
| 1959-1960 | USCG Light List - Vol. I-V: 2483 | ||
| 1961 | USCG Light List - Vol. I: 2483 | ||
| 1963 | |||
| 1965 | HORN, diaphragm; 1 blast ev 20s (2sbl). | None | |
| 1966 | USCG Light List - Vol. I: 2761 | ||
| 1969-1970 | HORN, diaphragm; 1 blast ev 30s (3sbl). | ||
| 1972 | |||
| 1973-1974 | HORN, 1 blast ev 30s (3sbl). | ||
| 1976 | HORN: 1 blast ev 30s (3sbl). | ||
| 1978 | |||
| 1982 | HORN: 1 blast ev 30s (3s bl). | ||
| 1987 | HORN: 1 blast ev 30s (3s bl). | USCG Light List - Vol. II: 3240 | |
| 1990-1992 | USCG Light List - Vol. II: 7350 | ||
| 1993-1996 | USCG Light List - Vol. II: 7990 | ||
| 2004 | None |
Historical Light List Other Signals
| 1927 | None | USLHS Light List (Atlantic): 1236 |
| 1931 | USLHS Light List (Atlantic): 1197 | |
| 1935 | RADIOBEACON. Transmits gps. of   . |
USLHS Light List (Atlantic): 1464 |
| 1943 | RADIOBEACON. Transmits on 306 kc, groups of 1 dash, 3 dots (). Antenna lead-in at center of tower. DISTANCE-FINDING STATION. |
USCG Light List (Atlantic): 1915 |
| 1945-1947 | RADIOBEACON: Transmits on 306 kc, groups of 1 dash, 3 dots (). Antenna lead-in at center of tower. DISTANCE-FINDING STATION. |
|
| 1950 | ||
| 1951-1952 | RADIOBEACON: Transmits on 306 kc, groups of 1 dash, 3 dots (). Antenna lead-in at center of tower. DISTANCE-FINDING STATION. Special Radio Direction Finder Calibration Service (296 and 480 kHz, F3  ). |
|
| 1953 | RADIOBEACON: 306 kc (Code: ). Antenna at center of tower. |
USCG Light List - Vol. I-VI: 2096 |
| 1954-1955 | Special Radio Direction Finder Calibration Service (314 and 480 kHz, F3 , For calibration on 314 kc, follow procedure on p. XIV (of light list); to change to 480 kc, dip flaghoist.). |
|
| 1957 | ||
| 1959-1960 | USCG Light List - Vol. I-V: 2483 | |
| 1961 | Special Radio Direction Finder Calibration Service (314 and 480 kHz, F3 , For calibration on 314 kc, follow procedure on p. XVII (of light list); to change to 480 kc, dip flaghoist.). |
USCG Light List - Vol. I: 2483 |
| 1963 | ||
| 1965 | None | |
| 1966 | USCG Light List - Vol. I: 2761 | |
| 1969-1970 | ||
| 1972-1974 | ||
| 1976 | ||
| 1978 | ||
| 1982 | ||
| 1987 | USCG Light List - Vol. II: 3240 | |
| 1990-1992 | USCG Light List - Vol. II: 7350 | |
| 1993-1996 | USCG Light List - Vol. II: 7990 | |
| 2004 |
 |
1883 - Present |