If anyone can point me to the documentation of the 9832-foot elevation for Matterhorn, I'll be happy to change it again. It seems that there are quite a few different measurements floating around for both Matterhorn and Sacajawea, but at least it seems that it is now established which one is higher.
A fun winter trip is to climb Sacagawea by one of several couliors, then traverse over to Matterhorn. Watch for small karst caves on the ridge between the two summits.
The Matterhorn is the second highest peak in the Wallowa Mountains. Nearby Sacagawea Peak (about 2 miles to the north of the Matterhorn) is the highest nonvolcanic peak in the Pacific Northwest and the Wallowas. The Matterhorn is 9832 feet above sea level, while Sacagawea is seven feet higher (9839 feet). The Matterhorn is the second-highest peak in the Wallowas.