Eldred Rock (Alaska)
Historical Light List Characteristics
| 1906 | F W. Obscured between N and E. covers Sullivan Island. | LHB Light List (Dist. 12-13): 256 |
| 1911 | AlFl RW 20s. W15, R15. | USLHS Light List (16th-18th): N/A |
| 1913 | AlFl WR 20s. W15, R15. fl 1.5. | USLHS Light List (16th): N/A |
| 1914 | AlFl RW 20s. W15, R15. fl 2. | USLHS Light List (Pacific): 600 |
| 1930-1933 | AlFl WR 20s. W15, R15. fl 1.2. | USLHS Light List (Pacific): 1224 |
| 1945 | AlFl WR 20s. W15, R15. fl 0.5. | USCG Light List (Pacific): 2298 |
| 1950-1951 | ||
| 1952-1960 | USCG Light List - Vol. I-V: 2534 | |
| 1961-1963 | USCG Light List - Vol. III: 2534 | |
| 1964-1972 | AlFl WR 20s. W15, R15. fl 0.3. | USCG Light List - Vol. III: 3188 |
| 1973 | AlFl WR 20s. W20, R20. fl 0.3. | |
| 1974 | Fl W 6s. W7. | |
| 1975-1977 | USCG Light List - Vol. III: 3235 | |
| 1978-1984 | Fl W 6s. W8. | |
| 1985 | USCG Light List - Vol. VI: 3235 | |
| 1986 | USCG Light List - Vol. VI: 23880 | |
| 1988 | ||
| 1990 | ||
| 2004 |
Historical Light List Optics and Structures
| 1906 | Lens Lantern | 6 | 40 | Lantern suspended from an arm on a stake. | LHB Light List (Dist. 12-13): 256 |
| 1911 | 4th | N/A | N/A | White; gray lantern. Octagonal; wooden tower on building. | USLHS Light List (16th-18th): N/A |
| 1913 | 4 o | 91 | USLHS Light List (16th): N/A | ||
| 1914 | N/A | 50 | White; octagonal wooden tower on building; gray lantern. | USLHS Light List (Pacific): 600 | |
| 1930-1933 | 4 o | 56 | White octagonal tower on building. | USLHS Light List (Pacific): 1224 | |
| 1945 | 4 e | USCG Light List (Pacific): 2298 | |||
| 1950-1951 | |||||
| 1952-1960 | N/A | USCG Light List - Vol. I-V: 2534 | |||
| 1961-1963 | USCG Light List - Vol. III: 2534 | ||||
| 1964-1974 | USCG Light List - Vol. III: 3188 | ||||
| 1975-1984 | USCG Light List - Vol. III: 3235 | ||||
| 1985 | USCG Light List - Vol. VI: 3235 | ||||
| 1986 | USCG Light List - Vol. VI: 23880 | ||||
| 1988 | |||||
| 1990 | |||||
| 2004 | N/A |
Historical Light List Audible Fog Signals
| 1906 | None | None | LHB Light List (Dist. 12-13): 256 |
| 1911 | USLHS Light List (16th-18th): N/A | ||
| 1913 | 1st-cl. air siren: Blast 5 sec. Silent 40 sec. | USLHS Light List (16th): N/A | |
| 1914 | 1st-cl. air siren: Blast 5 sec. Silent 40 sec. Horn faces channel on eastern side of islet. | USLHS Light List (Pacific): 600 | |
| 1930-1933 | SIREN, 1st-cl. air; blast 5 sec., silent 40 sec. Horn points east. | USLHS Light List (Pacific): 1224 | |
| 1945 | SIREN, 1st-cl. air; blast 3 sec., silent 27 sec. | USCG Light List (Pacific): 2298 | |
| 1950-1951 | DIAPHONE, two-tone, air; blast 3 sec., silent 27 sec. | ||
| 1952-1953 | DIAPHONE, two-tone; when operating, is synchronized with radiobeacon ev 3 minutes for distance finding. | USCG Light List - Vol. I-V: 2534 | |
| 1954-1960 | DIAPHONE, two-tone; when operating, is synchronized with radiobeacon ev 3 minutes for distance finding. | ||
| 1961 | USCG Light List - Vol. III: 2534 | ||
| 1962-1963 | DIAPHONE, two-tone; 1 blast ev 30s (3sbl). | ||
| 1964-1968 | HORN, diaphragm; 1 blast 30s (3sbl). | USCG Light List - Vol. III: 3188 | |
| 1969-1972 | HORN, diaphragm; 1 blast ev 30s (3sbl). | ||
| 1973 | HORN, 1 blast ev 30s (3sbl). | ||
| 1974 | None | ||
| 1975-1984 | USCG Light List - Vol. III: 3235 | ||
| 1985 | USCG Light List - Vol. VI: 3235 | ||
| 1986 | USCG Light List - Vol. VI: 23880 | ||
| 1988 | |||
| 1990 | |||
| 2004 |
Historical Light List Other Signals
| 1930-1933 | None | USLHS Light List (Pacific): 1224 |
| 1945 | RADIOBEACON: Transmits on 294 kc, groups of dot, dash, 2 dots (  ). Antenna lead-in at light tower. DISTANCE-FINDING STATION. |
USCG Light List (Pacific): 2298 |
| 1950-1951 | RADIOBEACON: Transmits on 294 kc, groups of dot, dash, 2 dots (). Antenna lead-in at light tower. DISTANCE-FINDING STATION. |
|
| 1952-1953 | RADIOBEACON: 294 kc (Code: ). Antenna at light tower. |
USCG Light List - Vol. I-V: 2534 |
| 1954-1960 | RADIOBEACON: 286 kc (Code: ). Antenna at light tower. |
|
| 1961 | USCG Light List - Vol. III: 2534 | |
| 1962-1963 | RADIOBEACON: Antenna at light tower. | |
| 1964-1973 | USCG Light List - Vol. III: 3188 | |
| 1974 | None | |
| 1975-1984 | USCG Light List - Vol. III: 3235 | |
| 1985 | USCG Light List - Vol. VI: 3235 | |
| 1986 | USCG Light List - Vol. VI: 23880 | |
| 1988 | ||
| 1990 | ||
| 2004 |
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1905 - Present |