In 1901, Kittredge was appointed to the U.S. Senate to fill the vacancy caused by the death of James H. Kyle.[6] He was elected to a full term in 1903,[7] and served from July 11, 1901 to March 3, 1909.[8] While in the Senate, he was chairman of the Select Committee on Standards, Weights and Measures (57th Congress), the Committee on Patents (58th and 59th Congresses), and the Committee on Interoceanic Canals (60th Congress).[8] His committee on canals was in part responsible for the selection of Panama over Nicaragua as the location for construction of a canal between the Atlantic and Pacific Oceans.[1][9]
Kittredge was an unsuccessful candidate for renomination in 1908.[1][10] After leaving the Senate, he resumed the practice of law in Sioux Falls.[1]
Later life
In his later years, Kittredge's weight exceeded 300 pounds, and he began to experience health problems.[1] In October 1910, he became chronically ill after overexerting himself while walking from the courthouse to his offices in cold weather.[1] His doctors recommended that he end his law practice and business affairs, and Kittredge returned to Jaffrey to live in retirement.[1]
Death and burial
In February 1911, Kittredge traveled to Hot Springs, Arkansas in hopes of recovering his health.[1] He continued to decline, and became comatose in late April. He died in Hot Springs on May 4, 1911.[1] He was buried at Conant Cemetery in Jaffrey, New Hampshire.[1] Kittredge never married, and had no children.[1]
Annett, Albert; Lehtinen, Alice E. (2011). "Biography, Alfred Kittredge". JaffreyHistory.org. Jaffrey, NH: Jaffrey Historic District Commission. Retrieved January 18, 2019.