2018 Map of Twain

About this map

Seneca and the surrounding mining country of Plumas County define this landscape along the N Fork Feather River. The rugged topography is etched with numerous ravines and gulches, including Marion Ravine and Rich Gulch, reflecting a history of resource extraction shown by the Grizzly Mines and Monitor Mine. Linear settlements like Virgilia, Grays Flat, and Twain follow the river corridors and the rail line, which pierces the terrain at Tunnel Number 26. This layout illustrates the critical reliance on narrow canyon floors for both transportation and habitation in the Plumas National Forest. Local history is preserved at the Big Flat Cem and named flats such as Halsted Flat, which provide level ground amidst the steep slopes of Cold Spring Hill and Rush Creek Hill.