Just downstream is Telegraph Creek, the only permanent settlement on the river. Telegraph Creek, upstream of the Stikine's mouth, is considered the head of navigation on the Stikine. Turning south, the Stikine flows through the Tahltan Highland along the eastern side of the Coast Mountains, where it receives numerous tributaries including the Chutine and Porcupine Rivers. The gradient flattens considerably compared to the upper course, and after the Chutine confluence it becomes wide and braided. Its course takes it around the east and south sides of the massive Stikine Icecap, the source of numerous glaciers that descend to the valley floor. John Muir, who visited the Stikine country in 1879, described the lower Stikine as "a Yosemite 100 miles long" due to its hundreds of glaciers and other glacially formed features. The Stikine is joined by its largest tributary, the Iskut River, from the east before passing the former border station of Stikine, BC where it enters Alaska. Turning west, the river cuts through the Coast Mountains for to the sea. In Alaska, the channel gradient is very low, with tidal influences felt up to upstream from the mouth. The mouth of the Stikine forms a large delta opposite Mitkof Island about north of Wrangell and southeast of Petersburg. The main channel empties into the Eastern Passage at the head of Sumner Strait and Stikine Strait, while the North Arm splits off from the main channel and flows into Frederick Sound. King Slough splits southwest from the North Arm and enters Dry Strait, which connects the north end of Eastern Passage to Frederick Sound. Farm Island and Dry Island are situated between the north and main channels, with King Slough dividing the two. Due to sediment deposits from the Stikine River delta, Dry Strait is often dry at low tide and thus unsuitable for most ships using the Inside Passage. Marine traffic typically uses the Wrangell Narrows or the Chatham Strait further west. Discharge By flow volume, the Stikine is the largest river in southeast Alaska and the fifth largest river in BC. Flows of the Stikine River are affected by three main sources of runoff: snowmelt from the Stikine Plateau (peaking late spring or early summer), glacier melt from the Coast Mountains (peaking late summer), and rainfall from coastal Pacific storms (peaking autumn). The U.S. Geological Survey has operated a stream gage near the mouth of the river from