Whitebark Pine, White-bark Pine: Pinus albicaulis (Synonym: Apinus albicaulis) - Needles 5 per bundle, 4-6 cm long. Cones ovate, to 8 cm. Trees of timberline and above (above 5000'). I'm not sure that this is found in the gorge.
Lodgepole Pine: Pinus contorta var. latifolia (Synonyms: Pinus contorta ssp. latifolia, Pinus contorta ssp. murrayana, Pinus contorta var. murrayana, Pinus divaricata var. hendersonii, Pinus divaricata var. latifolia) - Needles 2 per bundle, 3-5 cm long. Cones 4-6 cm long.
Mountain White Pine, Western White Pine: Pinus monticola (Synonyms: Pinus strobus var. monticola, Strobus monticola) - Needles 5 per bundle, 4-10 cm long. Cones cylindrical, longer than 10 cm. Trees of 2000-5000'.
Blackjack Pine, Bull Pine, Ponderosa Pine, Western Yellow Pine: Pinus ponderosa var. ponderosa (Synonyms: Pinus beardsleyi, Pinus benthamiana, Pinus brachyptera, Pinus ponderosa var. scopulorum, Pinus washoensis) - Needles 3 per bundle, 12-25 cm long. Cones 8-14 cm long.