In 1848, John Sutter's landing just north of the present I Street bridge was little more than a three-hundred-foot sand bar, but after gold was discovered at his Coloma sawmill, hundreds of ocean-going sailing ships crowded Sacramento's waterfront. Because those ships were too large for river travel, smaller one- and two-masted vessels replaced them, and steamboats soon followed. By 1854, the foot of K Street was a busy center of activity, and Sacramento had become the most important shipping terminal in the gold region. In the 1860s, Central Pacific Railroad built an extensive docking facility and freight yard by the river between H and K Streets. In 1910, Southern Pacific, its successor, raised the entire waterfront 10 to 15 feet and built a concrete wall along the river from I to R Streets. As highways grew, the waterfront declined, and Old Sacramento now shows a partial restoration of the 1860s scene.