Numerous historic structures have been documented within RNSP. These structures range from the Old Redwood Highway (running north and south of the Klamath River), to structures such as ranching features and barns. Some structures are part of the larger cultural landscape.

Segments of the Old Redwood Highway and Radar Station B-71, a World War II radar station disguised as a barn, are listed on the National Register of Historic Places.

The Prairie Creek Fish Hatchery, located off Highway 101 near Orick, was one of the first small local hatcheries developed to improve sport and commercial fishing in the area. The hatchery, constructed in 1936, is one of only three remaining hatcheries that were built in California from 1871 to 1946. The hatchery is on the National Register of Historic Places.

Six sites in the Bald Hills near Redwood Creek are associated with late 19^th century cattle and sheep ranching. The Lyons' Ranches Rural Historic District includes eight structures dating to the late 19^th and early 20^th centuries. Each structure has been stabilized, and some of the structures are eligible for listing on the National Register of Historic Places.

East of Crescent City in the Little Bald Hills is Murphy’s Ranch and outlying barn site, which dates circa 1884 to the 1920s. The ranch was established along the historic Kelsey Trail, a pack route linking Crescent City with the Salmon and Trinity gold mines.

A remnant of the Trinidad Trail joins the Tall Trees Grove Trail. The trail connected coastal supply centers with early gold mining sites, and was later adopted by homesteaders in the Bald Hills.

Several sites associated with the Union Gold Bluffs Placer Mine, which was in operation from 1872 to 1901, have been identified in the Gold Bluffs Beach area.

Radar Station B-71, which sits atop an ocean bluff south of Klamath, is a rare example of a World War II early warning radar station. The site consists of two structures and other military features, including radar antennas and two machine gun emplacements.

Camp Lincoln, which consists of four structures located east of Kings Valley Road, is designated a California State Historic Landmark for its significance as one of the major 19^th century military outposts in the vicinity of Humboldt and Del Norte counties. Only a house and outbuilding date from the 19^th century.

Walker Ranch, dating from the early 20^th century, rests along the west side of the Smith River and consists of concrete foundations, walkways, and walls.

Huffman Ranch, on Howland Hill Road, consists of a house and large garage.

Nickerson Ranch, along Mill Creek, was established during the late 19^th century. Once a cabin, garden, and orchard existed here, but no physical remains of the cabin are visible today.

Other historic buildings within Jedediah Smith Redwoods State Park are Lincoln School built in 1871, the Tracy Property from the 1920s or 1930s, and the Hickock House from the 1970s.

The Old Redwood Highway, originally constructed in 1923, traverses the western section of the park.

Remains of the Del Norte Southern Railroad can be found along the Trestle Loop Trail. The railroad was a subsidiary of the Hobbs,Wall and Company, which controlled large land and timber holdings throughout the region in the late 19^th and early 20^th centuries. The railroad was used to transport lumber from the forests to the company’s mill in Crescent City.

The Boyes House and associated structures are in the northeastern section of Elk Prairie. The site consists of an early 20^th century Bungalow Style residence, several other structures, and a small orchard.

Other historical buildings and structures within the park include the Huggins Homesite (occupied from 1914 to 1967 by Frederick Huggins), Caruther’s Cove Cabin, the Indian Tree House (a hollow, burned out redwood), and the Old Cabin and Store Site.