Its name is derived from a wonderful echo of ten words returned from the smooth wall seen in the cut on page 203. It is only a mile long with walls of 600 feet. At its head enter the Yampa River and Canyon, which mark the foot of Lodore, the most striking gorge, next to the Grand Canyon, on the whole river. Lodore is only 20 miles long, but it is 20 miles of concentrated water-power energy and grandeur, the fall being about 400 feet, the walls 2700. Never for a moment does it relax its assault, and the voyager on its restless, relentless tide, especially at high water, is kept on the alert. The waters indeed come rushing down with fearful impetuosity, recalling to Powell the poem of Southey, on the Lodore _he_ knew, hence the name. The beginning of the gorge is at the foot of Brown’s Park through what is called the Gate of Lodore, an abrupt gash in the Uinta Mountains 2000 feet deep. In viewing this entrance the ordinary spectator is at a loss to comprehend how the stream could have begun its attack upon this precipitous ridge. The theory that the river was there before the upheaval formed the mountain does not entirely satisfy, for it would seem in that case that the canyon walls would long ago have become much more broken down than they are. But the walls have a strikingly fresh look, as if formed recently, compared with the time of the original upheaval. It seems possible that there may have been in this region some great lake which lifted the waters up to the top of the ridge to begin their work of corrasion. Such lakes did exist; but lack of space forbids the further pursuit of this discussion here. [9] The character of the Grand River is similar to that of the Green, but the canyons above the mouth of the Dolores are not so long nor so deep. The river also carries less water. Pinnacles in Split Mountain Canyon. Pinnacles in Split Mountain Canyon. Photograph by E.O. BEAMAN, U.S. Colo. Riv. Exp. Head of the Canyon of Lodore just inside the “Gate”. Head of the Canyon of Lodore just inside the “Gate”. Walls 2500 feet high; river 300 feet wide. Photograph by E.O. BEAMAN, U.S. Colo. Riv. Exp. Pot-hole in Intermittent Water Course, Glen Canyon. Pot-hole in Intermittent Water Course, Glen Canyon. Homogeneous sandstone. These holes are often 10 to 15 feet deep, with the stones which ground them lying in the bottom. Photograph by J. FENNEMORE, U.S. Colo. Riv. Exp.