Downtown Juneau sits at sea level, with tides averaging , below steep mountains about to high. Atop these mountains is the Juneau Icefield, a large ice mass from which about 30 glaciers flow; two of these, the Mendenhall Glacier and the Lemon Creek Glacier, are visible from the local road system; the Mendenhall glacier has been generally retreating; its front face is declining both in width and height.