Parley P. Pratt
Pratt, assigned as a missionary to Polynesia, traveled with the original San Bernardino group. This is his discription of Mountain Medows in southern Utah.

April 23, 1851: After passing a few miles of very hilly road, we came down upon a small stream which heads in numerous spring meadows near the rim of the basin, on the divide between it and the Colorado. Here we stopped to rest on Saturday and Sunday.

This little mountain paradise was, by the present road, three hundred and eleven miles from Great Salt Lake City, and was altogether the most beautiful place in all the route. Some thousand or fifteen hundred acres of bottom, or meadow lands, were spread out before us like a green carpet richly clothed with a variety of grasses, and possessing a soil both black, rich and quick - being a mixture of sand, gravel and clayey loam, and the decayed visitations of ages. It is everywhere moistened with springs, and would produce potatoes, vegetables and small grains in abundance without watering.

Parley P. Pratt, The Autobiography of Parley Parker Pratt, pp. 420-21.