Seguin Light is a lighthouse

Lighthouse

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses or, in older times, from a fire, and used as an aid to navigation for maritime pilots at sea or on inland waterways....

 on Seguin Island at the mouth of the Kennebec River

Kennebec River

The Kennebec River is a river that is entirely within the U.S. state of Maine. It rises in Moosehead Lake in west-central Maine. The East and West Outlets join at Indian Pond and the river then flows southward...

, Maine.
It was first established in 1795. The present structure was built in 1857. It is the highest lighthouse on the Maine coast and has the only first order Fresnel lens

Fresnel lens

A Fresnel lens is a type of lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses.The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design...

ever used there. A first order lens assembly is around 12 feet (3.7m) tall; this can be seen in the photo of the lighthouse.

Although the USCG Light List says it is a "Brick conical tower", all of the photographs show a white cylindrical tower apparently made of granite blocks.

Seguin Light was listed on the National Register of Historic Places as "Seguin Island Light Station" on March 8, 1977, reference number 77000084. Note that although the NRHP listing gives a date of 1790, the USCG web site and other references suggest that the current tower was built in 1857.

Keepers

• John Polereszky (1796–1802)
• Christopher Pushard (assistant, 1796–1802)
• John Hollaway (assistant? c.1800)
• Moses Haskell (1802–1822)
• Jonathan Delano (1822–1825)
• Spencer Delano (assistant? c.1820)
• John Salters (1825–1839)
• Nathaniel Springer Todd (1839–1849)
• James Marston (1849–1853)
• A. E. Osgood (1853–1857)
• Boyd L. Miles (assistant, 1855)
• Joseph King (assistant, 1855)
• Stephen Marston Jr. (1857)
• Daniel Dodge (1857)
• John C. Lowell (1857–1859)
• Granville Lowell (1859–1861)
• Tallman B. Lowell (assistant, 1859–1860)
• William M. Knight (1860–1861)
• Zina H. Spinney (1861–1866)
• P. O. Spinney (assistant, 1861–1865)
• David Spinney 2nd (assistant, 1861–1863)
• David Spinney (assistant, 1863–1865)
• Rachel Spinney (assistant, 1865–1866)
• William S. Oliver (assistant, 1865–1866)
• Francis L. Morrill (1866–1868)
• William C. Marr (assistant, 1866)
• Ephraim S. Marr (assistant, 1866 and 1874–1875)
• Henry E. Morrill (1866–1867)
• Charles S. Morrill (assistant, 1866–1867)
• Jane Morrill (assistant, 1867–1869)
• Arthur Hutchins (assistant, 1867–1869)
• Samuel G. Crane (1867–1875)
• O. B. Crane (assistant, 1868–1871)
• J. B. Crane (assistant, 1868–1974)
• Louisa N. Lane (Crane?) (assistant, 1871–1872)
• Turner Jewett (assistant, 1872)
• Elisha B. Crane (assistant, 1874–1875)
• Thomas Day (1875–1886)
• Thomas Bibber (assistant, 1876–1880)
• Willis E. Chase (assistant, 1875)
• Henry Wiley (assistant, 1881–1882)
• Samuel Cavanor (assistant, 1882)
• Fernando Wallace (assistant, 1882–1886)
• Edwin M. Wyman (assistant, 1886–1889)
• Henry Day (1886–1890)
• Henry M. Clark (assistant, 1887)
• William H. Wyman (assistant, 1888–1889)
• Jesse Pierce (assistant, 1889)
• Merritt P. Pinkham (assistant 1889-1890, head keeper 1890-1898)
• Parker O. Healey (assistant, 1890–1893)
• William A. Stetson (assistant 1898)
• Fred Hodgkins (assistant, 1903)
• George A. Lewis (1898–1903 and 1907–1912)
• Herbert L. Spinney (assistant 1893-1898, head keeper 1903-1907)
• Walter S. Adams (assistant, 1907–1908)
• Clifford B. Staples (assistant, 1908–1912)
• Henry M. Cuskley (1912–1915)
• Maurice M. Weaver (1915–1922)
• Arthur Marston (assistant? 1921-1923)
• Napoleon B. Fickett (1922–1926)
• Elson L. Small (1926–1930)
• Frank E. Bracey (assistant 1926-1930, head keeper 1930-1931)
• Millard H. Urquhart (assistant 1928-1931, head keeper 1931-1938)
• Jasper L. Cheney (assistant, 1930–1931)
• Joseph M. Conners (assistant, 1931–1936)
• Donald E. Robbins, assistant (1930–1932)
• Clinton L. Dalzell (assistant, 1932–1933)
• Floyd E. Singer (assistant, 1932–1933)
• Truman L. Lathrop (assistant, 1933–1934)
• Benjamin Stockbridge (assistant, 1934)
• Ernest F. Witty (assistant, 1935)
• George A. McKenney (assistant, 1935–1936)
• Clarence Skolfield (assistant, 1936–1944; Coast Guard head keeper 1944-1946)
• Arthur G. Hill (assistant, 1936–1938)
• Maxwell A. DeShon (assistant, 1938–1941)