Input: what was the class year of the man born on October 29 , 1845 who found notability at the 11th-longest river in the United States at 1,280 miles ( 2,060 km ) from its headwater source at the head of Blackwater Draw , Curry County , New Mexico to its mouth at the Gulf of Mexico with a 45,000-square-mile ( 116,000 km2 ) drainage basin ?
Output: 1870