By 1826 steamboat traffic up the Missouri began to assume regularity. The navigation was dangerous and difficult because the Missouri never kept even an approximately constant head of water. In times of drought it became very shallow, and in times of flood it tore its wayward course open in any direction it chose. "Of all variable things in creation," wrote a Western editor, "the most uncertain are the action of a jury, the state of a woman's mind, and the condition of the Missouri River." A further handicap, and one which was unknown on the Ohio and rare on the Mississippi, was the lack of forests to supply the necessary fuel. The Missouri, it is true, had its cottonwoods, but in a green state they were poor fuel, and along vast stretches they were not obtainable in any quantity. The steamboat linked St. Louis with that vital stretch of the river lying between the mouth of the Kansas and the mouth of the Nebraska. From this region the great Western trail ran on to California and Oregon. In the early thirties Bonneville, Walker, Kelley, and Wyeth successively essayed this Overland Trail by way of the Platte through the South Pass of the Rockies to the Humboldt, Snake, and Columbia rivers. From Independence on the Missouri this famous pathway led to Fort Laramie, a distance of 672 miles; another 300-mile climb brought the traveler through South Pass; and so, by way of Fort Bridger, Salt Lake, and Sutter's Fort, to San Francisco. The route, well known by hundreds of Oregon pioneers in the early forties, became a thoroughfare in the eager days of the Forty-Niners. ¹ ¹ For map see The Passing of the Frontier, by Emerson Hough (in The Chronicles of America).