It was the Yampa, sometimes called Bear River.
After a side trip of several hours up this canyon they started again on the descent and, skirting the smooth perpendicular wall which forms the west side of Echo Park, they turned a corner and found themselves in a new gorge, which, on account of many whirlpools existing at that stage of water, was called Whirlpool Canyon.

The run through this was accomplished with great rapidity, as there were no serious obstacles, and in two days the expedition emerged into another expansion of the walls, where the tired men had a brief respite before they perceived the rocks, again closing in on the water.
Here a deer was brought in by one of the men, and, as they killed a mountain sheep farther up, they had not suffered for fresh meat.

The entrance to the next canyon was very abrupt, and they were soon whirling along on a swift current.

Though there were many rapids, landings were easy, and there was plenty of standing room everywhere, so that in two days they had the pleasure of pulling out of this Split Mountain Canyon into the Wonsits Valley, the longest opening in the whole line of canyons.

Thus far, no Amerinds had been seen, not even signs of them, but here they found some tipi poles and the dead embers of a camp-fire, showing that other human beings besides themselves had traversed the lands now about them.