The Stehekin River flows generally west and southwest from these mountains, south of Park Creek Ridge to its confluence with Park Creek. Shortly below Park Creek the river receives Bridge Creek, one of its main tributaries. Bridge Creek joins from the north and drains northernmost Chelan County in North Cascades National Park. Bridge Creek and its tributaries drain a number of significant peaks including Goode Mountain, Storm King, Mount Logan, Black Peak, and others. Bridge Creek's source is located near Rainy Pass and Washington Pass along Washington State Route 20. The Stehekin River continues generally southeast below McGregor Mountain to the northwest end of Lake Chelan. Shortly above the lake it receives Agnes Creek, another significant tributary, from the west. Agnes Creek drains the northernmost part of Wenatchee National Forest. Its final mile marks the boundary between North Cascades National Park and Lake Chelan National Recreation Area.