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The Forest Service in an environmental analysis of the project said large fires in 1910 and 1934 along with fire suppression in following decades reduced the presence of white pine, western larch and Ponderosa pine.

The east side of the park is dominated by aspens, while the west side features the western larch, a conifer exclusive to the Inland Northwest.

The board also approved a $165,000 plan by the Lands Department to start a seed orchard near Lewiston to provide western larch and Douglas-fir seed.

Forest Service officials started the experiment in a young forest of western larch—a conifer common in the Inland Northwest.

But when an area is planted, only 10 percent of the trees can be western larch, says Aitken.