Major Long's 1823 expedition up the Minnesota River (then known as St. Peter's River), to the headwaters of the Red River of the North, down that river to Pembina and Fort Garry, and thence by canoe across British Canada to Lake Huron is sometimes confused with his initial expedition to the Red River in modern-day Texas and Oklahoma.
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This expedition for a time was joined by the Italian adventurer Giacomo Beltrami, who argued with Long and left the expedition near Fort Garry.
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Later, in 1823 he led additional military expeditions into the United States borderlands with Canada, exploring the Upper Mississippi Valley, the Minnesota River, the Red River of the North and across the southern part of Canada.
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In March 1819 he married Martha Hodgkiss of Philadelphia, Pennsylvania, the sister of Isabella Hodgkiss Norvell, wife of US Senator John Norvell.
Stephen Harriman Long (1784-1864), American engineer, explorer, and military officer
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Other notable explorations included the Pike expedition of 1806–07 by Zebulon Pike, the journey along the north bank of the Platte River in 1820 by Stephen H. Long to what came to be called Longs Peak, the John C. Frémont expedition in 1845–46, and the Powell Geographic Expedition of 1869 by John Wesley Powell.