Semiahmoo Harbor Light (WA)
Historical Light List Characteristics
| Year | Characteristic | Reference Number |
| Missing light lists prior to 1895 | ||
| 1895 | F W. | LHB Light List (Dist. 12-13): 1032 |
| 1896 | F R. | LHB Light List (Dist. 12-13): 1143 |
| Missing light lists for 1897-1899 | ||
| 1900 | F R. | LHB Light List (Dist. 12-13): 191 |
| Missing light lists for 1901-1905 | ||
| 1906 | F R. | LHB Light List (Dist. 12-13): 242 |
| Missing light lists for 1907-1910 | ||
| 1911 | F R. R11. Obscured 294.25°-024.25°(90°). | USLHS Light List (16th-18th): NA |
| Missing light lists for 1912-1913 | ||
| 1914 | Oc W 20s. W11. ec 5. Obscured 294°-024°(90°). | USLHS Light List (Pacific): 460 |
| Missing light lists for 1915-1929 | ||
| 1930-1933 | Oc W 20s. W12. ec 5. Obscured 294°-024°(90°). | USLHS Light List (Pacific): 926 |
| Missing light lists for 1934-1944 | ||
| 1945 | Fl W 7.5s. W10. fl 0.5. Obscured 294°-024°(90°). | USCG Light List (Pacific): 1817 |
| Missing light lists for 1946-1949 | ||
| 1950 | Fl W 7.5s. W10. fl 0.5. Obscured 294°-024°(90°). | USCG Light List (Pacific): 1817 |
| 1951 | USCG Light List (Pacific): 1978 | |
| 1952-1960 | USCG Light List - Vol. I-V: 1978 | |
| 1961-1963 | USCG Light List - Vol. III: 1978 | |
| 1964-1971 | Fl W 7.5s. W10. Obscured 294°-024°(90°). | USCG Light List - Vol. III: 2531 |
| 1972 | Fl W 6s. W10. fl 1. Obscured 294°-024°(90°). | |
| 1973-1974 | Fl W 6s. W12. Obscured 294°-024°(90°). | |
| 1975-1984 | USCG Light List - Vol. III: 2632 | |
| 1985 | USCG Light List - Vol. VI: 2632 | |
| 1986 | USCG Light List - Vol. VI: 19920 | |
| 1988 | ||
| 1990 | ||
| Missing light lists for 1991-2003 | ||
| 2004 | Fl R 6s. R4. | USCG Light List - Vol. VI: 19920 |
Historical Light List Optics and Structures
| Year | Optic | Tower Height | Focal Plane | Description | Reference Number |
| Missing light lists prior to 1895 | |||||
| 1895 | Tubular Lantern | NA | 20 | Lantern suspended from an arm on a cluster of three red piles. | LHB Light List (Dist. 12-13): 1032 |
| 1896 | LHB Light List (Dist. 12-13): 1143 | ||||
| Missing light lists for 1897-1899 | |||||
| 1900 | Tubular Lantern | NA | 20 | Lantern suspended from an arm on a cluster of three red piles. | LHB Light List (Dist. 12-13): 191 |
| Missing light lists for 1901-1905 | |||||
| 1906 | 4th | NA | 41 | White, octagonal, one-and-one-half story, frame dwelling, with gray trimmings and bronze-colored roof; cylindrical lantern with bronze-colored roof; on a platform on piles. | LHB Light List (Dist. 12-13): 242 |
| Missing light lists for 1907-1910 | |||||
| 1911 | 4th | NA | NA | White; gray lantern. Octagonal dwelling; cylindrical lantern; on platform on piles. | USLHS Light List (16th-18th): NA |
| Missing light lists for 1912-1913 | |||||
| 1914 | NA | NA | 41 | White; octagonal, frame dwelling. | USLHS Light List (Pacific): 460 |
| Missing light lists for 1915-1929 | |||||
| 1930-1933 | 4 iov | NA | 48 | White octagonal frame dwelling, on piles. | USLHS Light List (Pacific): 926 |
| Missing light lists for 1934-1944 | |||||
| 1945 | 375 mm e | NA | 28 | White pyrmidal house on pile structure. | USCG Light List (Pacific): 1817 |
| Missing light lists for 1946-1949 | |||||
| 1950 | 375 mm e | NA | 28 | White pyrmidal house with red triangle on pile structure. | USCG Light List (Pacific): 1817 |
| 1951 | USCG Light List (Pacific): 1978 | ||||
| 1952-1960 | NA | USCG Light List - Vol. I-V: 1978 | |||
| 1961-1963 | USCG Light List - Vol. III: 1978 | ||||
| 1964-1965 | USCG Light List - Vol. III: 2531 | ||||
| 1966-1971 | Red triangular daymark on white pyramidal house on pile structure. | ||||
| 1972-1974 | 27 | NR on skeleton tower. | |||
| 1975-1984 | USCG Light List - Vol. III: 2632 | ||||
| 1985 | USCG Light List - Vol. VI: 2632 | ||||
| 1986 | NB on skeleton tower. | USCG Light List - Vol. VI: 19920 | |||
| 1988 | |||||
| 1990 | |||||
| Missing light lists for 1991-2003 | |||||
| 2004 | NA | NA | 15 | TR on pile structure. | USCG Light List - Vol. VI: 19920 |
 |
1894-Present (Approximate location: Assumed the lighthouse was located at or close to the position of the current modern light.) |