In 1855 he was one of the first missionaries called to serve in the Fort Lemhi Mission near present-day Salmon, Idaho, but was recalled in 1858 to serve as a member of the Utah militia during the Utah War. At this time his family participated in the "Move South" to Utah County, Utah. In early 1868, Belnap moved part of his family to western Weber County to the newly forming community of Hooper, where he was appointed the first "presiding elder" and later as bishop. It is said that Belnap desired to move his family out of Ogden to avoid the corrupting "gentile" influences that were arriving with the coming of the Transcontinental Railroad. In fact, his 40-acre homesite on the east banks of the Weber River in Ogden had been selected as the rail yards of "Junction City." On 8 March 1869, he sat on the reviewing stand with other dignitaries of Weber County for an historic celebration as the tracks and first Union Pacific Railroad engine steamed into Ogden. The old Belnap home was right near where the reviewing platform was built. Three of Gilbert's sons—Gilbert Rosel, Reuben, and Joseph—helped construct the Transcontinental Railroad through Weber Canyon. He was selected as the first marshal of Ogden City. He also served as Ogden's first prosecuting attorney and first sexton of the Ogden City Cemetery. He later served as Weber County sheriff and held numerous other community positions, including pound keeper, city attorney, county attorney, county assessor and collector, county court selectman, school district trustee, irrigation company trustee, 1872 Utah state constitutional convention delegate, district census taker, and U.S. mail contract awardee.
Legacy
Descendants of Gilbert Belnap now number over 10,000 and are found in most states and several countries outside the U.S. The Belnap Family Organization, a non-profit ancestral family organization, conducts primary genealogical research and preserves genealogical and other historical information on behalf of descendants of Gilbert Belnap and his wives Adaline Knight and Henrietta McBride and others surnamed Belnap or Belknap. It is one of the oldest and largest such family organizations in the United States, having been established in Utah in 1904. Gilbert Belnap's descendants have distinguished themselves in a wide variety of fields, including medicine, law, finance, business, religion, sports, politics, music, and education. Some notable descendants include Weber County sheriff Gilbert R. Belnap, Utah politician Arias G. Belnap, musician Ryan Shupe, vocal artist Michael Keith Belnap, LDS Church regional representative and Orlando Florida Templepresident Bruce E. Belnap, Brigham Young University College of Religious Education dean B. West Belnap, KSL News executive vice president and COO Jeff Simpson, mission president and physician W. Dean Belnap, prize-winning Latin American journalist David F. Belnap, and LDS General Authority Carl B. Cook, among others.