Over this dam the water flowed swiftly and smoothly, and then shot down in a fall six feet high. Below for a distance of two or three hundred yards was a furious rapid, the water running among black rocks. With considerable difficulty they made a portage of the boats and stores to the lower end of the rapid. This transit occupied several hours, and they then proceeded on their way. Five more miles were passed; several times the boats were brought to the bank in order that falls ahead might be examined. These proved to be not too high to shoot, and the boats paddled over them. When they had first taken to the river they would never have dreamt of shooting such falls, but they had now become so expert in the management of the boats, and so confident in their buoyancy, that the dangers which would then have appalled them were now faced without uneasiness.
They now came to a long rapid, presenting so many dangers that they deemed it advisable to let down the boats by lines. Again embarking they found that the wall of rocks closed in and they entered a narrow gorge, through which the river ran with great swiftness, touching the walls on each side. Great care was needed to prevent the boats being dashed against the rock, but they succeeded in keeping them fairly in the middle of the stream. After travelling four miles through this gorge it opened somewhat, and on one side was a strip of sand.
"We will land there," Harry said. "It looks to me like granite ahead, and if it is we are in for bad times, sure."
The boats were soon pulled up, and they proceeded to examine the cliffs below. Hitherto the danger had been in almost exact proportion to the hardness of the rock, and as they were entering a far harder rock than they had before encountered, greater difficulties than those they had surmounted were to be expected.
They could not see a long distance down, but what they saw was enough to justify their worst anticipations. The cañon was narrower than any they had traversed, and the current extremely swift. There seemed but few broken rocks in the channel, but on either side the walls jutted out in sharp angles far into the river, with crags and pinnacles.
"Waal, it is of no use looking at it," Jerry said after a pause. "It is certain we can't get along the sides, so there is nothing to do but to go straight at it; and the sooner it is over the better."
Accordingly they returned to the boats, and soon darted at the speed of an arrow into the race. Bad as it was at starting it speedily became worse: ledges, pinnacles, and towers of rock rose above the surface of the stream breaking it into falls and whirlpools. Every moment it seemed to Tom that the boat must inevitably be dashed to pieces against one of these obstructions, for the light boats were whirled about like a feather on the torrent, and the paddlers could do but little to guide their course. The very strength of the torrent, however, saved them from destruction, the whirl from the rocks sweeping the boat's head aside when within a few feet of them, and driving it past the danger before they had time to realize that they had escaped wreck. Half an hour of this, and a side cañon came in. Down this a vast quantity of boulders had been swept, forming a dam across the river, but they managed to paddle into an eddy at the side, and to make a portage of the boats to the water below the dam, over which there was a fall of from thirty to forty feet high. Three more similar dams were met with. Over one the canoes were carried, but on the others there was a break in the boulder wall, and they were able to shoot the falls.
After three days of incessant labour, they heard, soon after starting from their last halting-place, a roar even louder and more menacing than they had yet experienced. Cautiously they got as close as possible to the side, and paddling against the stream were able to effect a landing just above the rapid. On examining it they found that it was nearly half a mile long, and in this distance the water made a fall of some eighty feet, the stream being broken everywhere with ledges and jagged rocks, among which the waves lashed themselves into a white foam. It seemed madness to attempt such a descent, and they agreed that at any rate they would halt for the day. The rocks through which the cañon ran were fully a thousand feet high, but they decided that, great as the labour might be, it would be better to make a portage, if possible, rather than descend the cataract.
"There is a gulch here running up on to the hill," Tom said. "Hunting Dog and I will start at once and see if it is possible to get up it, and if so how far it is to a place where we can get down again."
Harry assented; Leaping Horse without a word joined the explorers, and they set off up the gulch. It was found that the ravine was steep, but not too steep to climb. When they were nearly at the top Hunting Dog pointed to the hillside above them, and they saw a big-horn standing at the edge of the rock. The three fired their rifles simultaneously, and the wild sheep made a spring into the air and then came tumbling down the side of the ravine. As fresh meat was beginning to run short this was a stroke of good fortune, and after reloading their guns they proceeded up the ravine until they reached the crest of the hill. The soil was disintegrated granite, and tufts of short grass grew here and there. After walking about a mile, parallel to the course of the river, they found that the ground descended again, and without much difficulty made their way down until they reached the foot of a little valley; following this they were soon standing by the side of the river. Above, its surface was as closely studded with rocks as was the upper cataract; below, there was another fall that looked impracticable, except that it seemed possible to pass along on the rocks by the side. It was getting dark by the time they rejoined their comrades.