Mountain Gem was 150 ft (45.72 m) long over the hull, exclusive of the fantail, which was the extension over the stern on which the stern-wheel was mounted.
 The steamer had a beam  26.5 ft (8.08 m) measured over the hull exclusive of long protective timbers, called guards, along the upper outside edge of the hull.
 The depth of hold was 5 ft (1.52 m) feet.
 To minimize the chance of sinking in the many rapids of the Snake River, the hull was divided into 29 water-tight compartments.

Overall size of the steamer was 469 gross tons and 282 net tons, with tons being a measure of volume and not weight.
 The merchant vessel registry number was 201045.
 On day excursions, Mountain Gem could carry 200 passengers.
 The steamer had overnight accommodations for 75 passengers.
Mountain Gem was 150 ft (45.72 m) long over the hull, exclusive of the fantail, which was the extension over the stern on which the stern-wheel was mounted.  The steamer had a beam  26.5 ft (8.08 m) measured over the hull exclusive of long protective timbers, called guards, along the upper outside edge of the hull.  The depth of hold was 5 ft (1.52 m) feet.  To minimize the chance of sinking in the many rapids of the Snake River, the hull was divided into 29 water-tight compartments.
Overall size of the steamer was 469 gross tons and 282 net tons, with tons being a measure of volume and not weight.  The merchant vessel registry number was 201045.  On day excursions, Mountain Gem could carry 200 passengers.  The steamer had overnight accommodations for 75 passengers.
Mountain Gem (sternwheeler)