San Luis Obispo (California)
Historical Light List Characteristics
| 1892 | AlFl RW 60s. W171/2, R171/2. | LHB Light List (Dist. 12-13): 833 |
| 1893 | LHB Light List (Dist. 12-13): 857 | |
| 1894 | LHB Light List (Dist. 12-13): 874 | |
| 1895 | LHB Light List (Dist. 12-13): 890 | |
| 1896 | LHB Light List (Dist. 12-13): 991 | |
| 1900 | LHB Light List (Dist. 12-13): 13 | |
| 1906 | LHB Light List (Dist. 12-13): 17 | |
| 1911 | AlFl RW 60s. W17, R17. | USLHS Light List (16th-18th): N/A |
| 1914 | Fl W 20s. W17. fl 4. | USLHS Light List (Pacific): 24 |
| 1930-1933 | USLHS Light List (Pacific): 68 | |
| 1945 | Fl W 20s. W17. fl 3. | USCG Light List (Pacific): 192 |
| 1950-1951 | ||
| 1952-1959 | USCG Light List - Vol. I-V: 201 | |
| 1960 | Fl W 20s. W17. fl 1.6. | |
| 1961-1963 | USCG Light List - Vol. III: 201 | |
| 1964-1965 | USCG Light List - Vol. III: 27 | |
| 1966-1972 | Fl W 20s. W17. fl 0.8. | |
| 1973-1974 | Fl W 20s. W21. fl 0.8. | |
| 1975-1984 | Fl W 5s. W24. | USCG Light List - Vol. III: 32 |
| 1985 | USCG Light List - Vol. VI: 32 | |
| 1986 | USCG Light List - Vol. VI: 225 | |
| 1988 | ||
| 1990 | ||
| 2004 | Fl W 5s. W20. |
Historical Light List Optics and Structures
| 1892 | 4th | 30 | N/A | Square, white, frame tower attached to SW corner of a one-and-one-half story white frame dwelling with lead-colored trimmings, green blinds, and brown roof; lantern, black. | LHB Light List (Dist. 12-13): 833 |
| 1893 | 133 | LHB Light List (Dist. 12-13): 857 | |||
| 1894 | LHB Light List (Dist. 12-13): 874 | ||||
| 1895 | LHB Light List (Dist. 12-13): 890 | ||||
| 1896 | LHB Light List (Dist. 12-13): 991 | ||||
| 1900 | 130 | LHB Light List (Dist. 12-13): 13 | |||
| 1906 | Square, white, frame tower attached to southwesterly corner of a one-and-one-half story white frame dwelling with lead-colored trimmings, green blinds, and brown roof; lantern, black. | LHB Light List (Dist. 12-13): 17 | |||
| 1911 | N/A | N/A | White. Square tower attached to dwelling. | USLHS Light List (16th-18th): N/A | |
| 1914 | N/A | 30 | 130 | White; square wooden tower on dwelling. | USLHS Light List (Pacific): 24 |
| 1930 | 4 iov | White square wooden tower on dwelling. | USLHS Light List (Pacific): 68 | ||
| 1931-1933 | 40 | ||||
| 1945 | 4 e | USCG Light List (Pacific): 192 | |||
| 1950-1951 | |||||
| 1952-1960 | N/A | White square tower on dwelling. | USCG Light List - Vol. I-V: 201 | ||
| 1961-1963 | USCG Light List - Vol. III: 201 | ||||
| 1964-1974 | USCG Light List - Vol. III: 27 | ||||
| 1975-1982 | N/A | N/A | 116 | On pole. | USCG Light List - Vol. III: 32 |
| 1983-1984 | On cylindrical structure. | ||||
| 1985 | USCG Light List - Vol. VI: 32 | ||||
| 1986 | USCG Light List - Vol. VI: 225 | ||||
| 1988 | |||||
| 1990 | |||||
| 2004 | N/A |
Historical Light List Audible Fog Signals
| 1892 | 10-inch steam whistle; blasts, 5 sec.; silent intervals, 35 sec. | None | LHB Light List (Dist. 12-13): 833 |
| 1893 | 10-inch steam whistle; blasts 5 sec., silent intervals 35 sec. | LHB Light List (Dist. 12-13): 857 | |
| 1894 | LHB Light List (Dist. 12-13): 874 | ||
| 1895 | LHB Light List (Dist. 12-13): 890 | ||
| 1896 | LHB Light List (Dist. 12-13): 991 | ||
| 1900 | LHB Light List (Dist. 12-13): 13 | ||
| 1906 | LHB Light List (Dist. 12-13): 17 | ||
| 1911 | None | USLHS Light List (16th-18th): N/A | |
| 1914 | 10-inch steam whistle: Blast 5 sec. Silent 35 sec. | USLHS Light List (Pacific): 24 | |
| 1930-1933 | SIREN, 1st-cl. air: Blast 4 sec., silent 36 sec. | USLHS Light List (Pacific): 68 | |
| 1945 | DIAPHONE, two-tone, air; group of 2 blasts every 30 sec. Blast 2 sec., silent 2 sec., blast 2 sec., silent 24 sec. | Siren if diaphone is disabled. | USCG Light List (Pacific): 192 |
| 1950-1951 | None | ||
| 1952-1953 | DIAPHONE, two-tone; when operating, is synchronized with radiobeacon ev 3 minutes for distance finding. | USCG Light List - Vol. I-V: 201 | |
| 1954-1960 | DIAPHONE, two-tone; when operating, is synchronized with radiobeacon ev 3 minutes for distance finding. | ||
| 1961 | USCG Light List - Vol. III: 201 | ||
| 1962-1963 | DIAPHONE, two-tone; gp of 2 blasts ev 30s (2sbl-2ssi-2sbl-24ssi). | ||
| 1964-1968 | USCG Light List - Vol. III: 27 | ||
| 1969 | DIAPHONE, two-tone; 2 blasts ev 60s (3sbl-3ssi-3sbl-51ssi). | ||
| 1970-1972 | HORN, diaphragm; 2 blasts ev 60s (3sbl-3ssi-3sbl-51ssi). | ||
| 1973-1974 | HORN, 2 blasts ev 60s (3sbl-3ssi-3sbl-51ssi). | ||
| 1975 | USCG Light List - Vol. III: 32 | ||
| 1976-1980 | HORN: 2 blasts ev 60s (3sbl-3ssi-3sbl-51ssi). | ||
| 1981-1984 | HORN: 2 blasts ev 60s (3s bl-3s si-3s bl-51s si). | ||
| 1985 | USCG Light List - Vol. VI: 32 | ||
| 1986 | HORN: 2 blasts ev 60s (3s bl-3s si-3s bl-51s si). | USCG Light List - Vol. VI: 225 | |
| 1988 | |||
| 1990 | |||
| 2004 | HORN: 2 blasts ev 60s (3s bl-3s si-3s bl-51s si). |
Historical Light List Other Signals
| 1930-1933 | None | USLHS Light List (Pacific): 68 |
| 1945 | RADIOBEACON: Transmits on 302 kc, groups of dash, dash, dot, dash (  ). Antenna lead-in 830 feet 2° from light tower. DISTANCE-FINDING STATION. |
USCG Light List (Pacific): 192 |
| 1950-1951 | RADIOBEACON: Transmits on 302 kc, groups of dash, dash, dot, dash (). Antenna lead-in 830 feet 2° from light tower. DISTANCE-FINDING STATION. |
|
| 1952-1960 | RADIOBEACON: 302 kc (Code: ). Antenna 275 yards 002° from light tower. |
USCG Light List - Vol. I-V: 201 |
| 1961 | USCG Light List - Vol. III: 201 | |
| 1962-1963 | RADIOBEACON: Antenna 275 yards 002° from light tower. | |
| 1964-1974 | USCG Light List - Vol. III: 27 | |
| 1975 | RBN: 320 kHz () VI. Antenna 275 yards 002° from light tower. |
USCG Light List - Vol. III: 32 |
| 1976 | RBN: 288 kHz ( ). Antenna 275 yards 002° from light tower. |
|
| 1977-1978 | RBN: 288 kHz (). Antenna located 275 yards 002° from light tower. |
|
| 1979-1984 | RBN: 288 kHz SL (). Antenna located 275 yards 002° from light tower. |
|
| 1985 | USCG Light List - Vol. VI: 32 | |
| 1986 | USCG Light List - Vol. VI: 225 | |
| 1988 | RBN: 288 kHz SL (). Antenna located 375 yards 081° from light tower. |
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| 1990 | ||
| 2004 | None |
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1890 - Present |