Admitted to the New York bar in 1809, in January, 1810 Walworth moved to
Plattsburgh, the Clinton County county seat and where his eldest brother Major John Walsworth served as clerk of the court. In 1811 Reuben Walworth was appointed a master of chancery, one of the local judges and whose particular responsibilities included overseeing and protecting widows and orphans, as well as issuing injunctions against nuisances. During the
War of 1812, Walworth served as adjutant-general of the New York militia, and as aide to General
Benjamin Mooers. In September 1814, the British invaded Plattsburg, and from the shore of
Lake Champlain, Walworth observed the naval victory of Commandant
Thomas Macdonough in the
Battle of Lake Champlain. He attained the rank of colonel and headed the division's judge advocate general corps by the war's end. His youngest brother Hiram Walworth (1799–1870) distinguished himself in the battle for the Saranac bridge in that war, and would later become a lawyer and serve for many years under their brother John in New York City. A midshipman in that battle, Charles Theodore Platt, would later become his brother-in-law. Their father also died in 1812, killed by one of his horses; his mother would survive another 25 years, cared for by family in upstate New York. Voters elected Walworth as a
Democratic-Republican to the
17th United States Congress. Serving alongside fellow Democratic-Republican
Nathaniel Pitcher (a future New York governor) in what was then
New York's 12th congressional district from December 3, 1821, to March 3, 1823, Walworth did not seek re-election in what became a one-representative district after census-based redistricting. During his Congressional term, in April 1823, Walworth was appointed Judge of the
New York Fourth Circuit Court. In October he moved to
Saratoga Springs,
Saratoga County, New York. Five years later, in 1828, Walworth was appointed
Chancellor of New York, and continued to conduct court in his parlor. He remained in office until July 1847 when the
State Constitution of 1846 abolished the office. Walworth wrote
Rules and Orders of the New York Court of Chancery (Albany, 1829; several revised eds.), which greatly influenced
equity practice in the United States. Walworth gained President
John Tyler's attention because of his widely respected opinions on
evidence,
pleadings,
civil procedure, and
arbitration. Tyler nominated him to the
Supreme Court of the United States three times in 1844, but the nomination was always postponed due to Tyler's lack of support from both
Whigs and the
Democrats. In
1848, Walworth was the
Hunkers' candidate for
Governor of New York, but was defeated in a three-way race by Whig
Hamilton Fish. In 1850, the United States Supreme Court appointed Walworth to serve as a commissioner (now
special master) in litigation concerning the new
Wheeling Suspension Bridge, the first bridge to cross a major river west of the
Appalachian Mountains. The justices had divided during the previous years concerning the scope of the federal power in the
Commerce Clause as well as concurrent state powers. In 1847, in
U.S. v. New Bedford Bridge Company Justice
Levi Woodbury on circuit duty had determined that no federal law defined obstruction of navigable waterways and upheld a drawbridge near the port, and Justice
Samuel Nelson had done similarly while a justice of the New York Supreme Court. The Commonwealth of Pennsylvania (through its attorney general
Cornelius Darragh) and Pittsburgh interests represented by
Edwin M. Stanton and
Robert J. Walker had brought this litigation in the
United States Supreme Court by seeking an injunction against the bridge from the justice responsible for that geographic area, former Pennsylvania judge for the Pittsburgh area,
Robert C. Grier. The Wheeling Bridge Company was represented by
Charles W. Russell and U.S. Attorney general
Reverdy Johnson (supposedly in a private capacity but who had denied Pennsylvania's request for his federal office's assistance)), among others. They argued the bridge helped the U.S. mails (delayed during ice and high and low water periods), connected military outposts, and that the public had a right to cross the river. Crucial to the equity required for the sought-after injunction, they argued, Pennsylvania had delayed two years while the bridge was under construction, as well as failed to prove irremediable injury (because technology also existed to lower steamboat smokestacks, as was necessary to use a downriver canal near
Louisville, Kentucky. After Justice Grier held a hearing in Philadelphia on August 16, 1849, on August 30 he refused the requested injunction to remove the bridge. Instead, he referred the matter to the full court. That heard argument on February 25, 1850, reviewed extensive depositions (361 printed pages) and then on May 29, 1850, Justice Nelson (over a dissent by Justice
Peter V. Daniel who would have refused jurisdiction altogether) issued a one-page order appointing Walworth as commissioner. Walworth received much scientific and commercial evidence, including a report from U.S. Army engineer
William Jarvis McAlpine. However, both parties were dissatisfied with Walworth's 770-page report, which he issued in December 1851. Pittsburgh was disappointed that Walworth refused to order the bridge removed. Virginia and Ohio interests complained because he found the waterway obstructed and recommended raising the bridge an additional 20 feet—which would cause enormous technical difficulties and additional cost. However, after reviewing both parties' exceptions, receiving another report from McAlpine and hearing more argument on February 23 and 24, the U.S. Supreme Court also refused to order the bridge removed, but instead amended the new required height to 111 feet. However, the bridge then disintegrated during a May 1854 windstorm and was rebuilt in eight weeks despite an injunction against such by Justice Grier (hence the 1856 litigation). Nonetheless, Walworth's report undergirded the Court's decisions in both 1852 as well as 1856 (the latter decision also relying on additional federal legislation). Completion of the B&O Railroad to Wheeling, and competition from a new steamboat line connection Wheeling with Louisville proved fatal to both steamboat companies, who soon dismantled their ships or sold them downriver for the Mississippi trade. Furthermore, additional bridges across the Ohio River were proposed for
Parkersburg,
Bellaire and
Steubenville. A truss pivot drawbridge across the Mississippi River between
Davenport, Iowa, and
Rock Island, Illinois, was completed in 1856. Returning to private legal practice, Walworth grew wealthy representing railroads in other litigation. He expanded the family mansion. As the
American Civil War neared, Walworth advocated peace and conciliation. A delegate at the
Peace Conference of 1861 after the election of President
Abraham Lincoln, his speech was published and circulated. As discussed below, his son Mansfield Walworth failed to receive a deferment from conscription during the
American Civil War and was imprisoned for three month in 1864 as a suspected Confederate spy until released and restricted to the Saratoga Springs vicinity. However, his stepson
Martin Davis Hardin (1837–1892), a West Point graduate, remained in the Union Army, distinguished himself in battle, and was promoted to General. ==Personal life==