Humboldt Redwoods State Park - Hardcoverby Susan J. P. O'Hara (Author), Dave Stockton (Author) The Eel River in Northern California is the third largest river in the state. Along its banks stand the largest remaining redwood groves in the world. They are preserved within Humboldt Redwoods State Park. Created in 1921 with the purchase of Bolling Grove near Myers Flat by the Save the Redwoods League, the park currently preserves 53,000 acres of forestland. Within the park are structures built