A bog was discovered here which it was thought would have to be crossed in the morning, so the Company was turned out to repair it. We were sent about a mile to cut and carry logs and brush; but after we had completed the crossing a better and shorter road was found, and our labor amounted to nothing more than a proof of the powers of endurance of the invincible sixty-four. _June 29_ (Tuesday). We marched thirteen miles, to Medicine Bow Creek. We passed safely over four creeks, and were congratulating ourselves upon our success when we were stopped short upon the banks of Medicine Bow or Rock Creek. Here was a doleful sight; the creek was about thirty yards wide, with a current which rushed over the large boulders on the bottom with fearful impetuosity. Where it struck a large rock the water would dash up to a height of five or six feet. A stone, weighing about thirty pounds was thrown in, and finally rested on the bottom about three yards downstream from where it first touched the water; and it would not then have stopped in its onward career had it not been arrested by coming into contact with a larger stone on the bottom. All stood surveying these fearful rapids, waiting to see what the first order would be. It was decided that the Engineers should endeavor to get across and rig a bridge of driftwood. Several of us instantly prepared for the undertaking, a place being selected where the stream was divided by rocks and drift into four separate channels. The first two were not so swift as the others and we effected a crossing over them quite safely. The next was more difficult; several had a very narrow escape in crossing; but many, with the assistance of poles, succeeded in reaching the island. This was separated from the farther shore by a single additional channel, which, although narrow, was the most perilous of all. Three or four of the largest men made their way across, jumping first into the stream as far as they could, struggling as they were whirled down by the rushing current, and contriving at last to get hold of bushes on the far bank and so to drag themselves out of the water. By the aid of ropes we then managed to get a bridge of logs over the most dangerous channels, and the Regiment crossed with perfect safety. A few rods below the wagons were crossing, and we were signally favored by Providence in getting everything over as well as we did, losing only two mules, which were carried off their feet by the current and instantly drowned. _June 30_ (Wednesday). We went as far as the Medicine Bow Butte, a distance of sixteen miles. Our course lay over the lower bluffs of the Medicine Bow Mountains, ascending and descending the many steep hills. The surface was hard and gravelly, and covered with wild sage or artemisia.