Situated at the extreme southwestern tip of Washington state where the Columbia River meets the Pacific Ocean, the Cape Disappointment Historic District is of outstanding national significance for its associations with early exploration, maritime transportation, and military history. The cape was a pivotal landmark for maritime fur traders, Spanish and English explorers, and most notably, the Lewis and Clark Expedition, which reached this destination in November 1805, marking the successful completion of their transcontinental journey. Officially listed on the National Register of Historic Places in 1975, the district encompasses a dramatic landscape that has played a vital role in the commercial and political development of the Pacific Northwest.

The district's built environment reflects over a century of maritime safety and coastal defense efforts. It features the Cape Disappointment Lighthouse, constructed in 1856 as the oldest operating lighthouse in the Pacific Northwest, and the North Head Lighthouse, built in 1898 to provide additional guidance through the treacherous waters known as the "Graveyard of the Pacific." Additionally, the district contains the remnants of Fort Canby (originally Fort Cape Disappointment), established during the Civil War to protect the mouth of the Columbia River and later expanded during World Wars I and II. Together, these historic structures and defense installations document the evolution of federal efforts to secure and facilitate commerce along one of the nation's most crucial and dangerous waterways.

Chinook Point, situated on the north shore of the Columbia River estuary in Pacific County, Washington, is a site of profound historical significance marking pivotal moments in the European exploration, trade, and indigenous history of the Pacific Northwest. In 1792, Captain Robert Gray, commanding the Columbia Rediviva, anchored near this prominent headland, securing his legacy as the first Euro-American to enter and document the Columbia River, which subsequently established early United States claims to the Oregon Country. A little over a decade later, in November 1805, the Lewis and Clark Expedition reached the area, establishing "Station Camp" nearby and documenting their long-awaited arrival at the Pacific Ocean. Long before these explorers arrived, Chinook Point was a vital political and commercial hub for the Chinook Indian Nation, under the leadership of the influential Chief Comcomly, who played a critical role in facilitating early maritime fur trade and diplomatic relations in the region.

In addition to its exploration-era prominence, the site transitioned into a strategic military installation at the turn of the 20th century. Established as Fort Columbia between 1896 and 1904, the post was constructed as part of the Endicott Period coastal defense system designed to safeguard the mouth of the Columbia River from foreign naval threats. The fort remained active through both World War I and World War II, housing coastal artillery batteries and serving as a vital component of the Harbor Defenses of the Columbia. Designated a National Historic Landmark in 1970, Chinook Point is today preserved within Fort Columbia State Park, where its historic military barracks, gun batteries, and unaltered natural vistas stand as a testament to more than two centuries of American exploration, indigenous sovereignty, and coastal defense.

The Klipsan Beach Life Saving Station, established in 1912 on the Long Beach Peninsula in Pacific County, Washington, holds immense historical significance as one of the very few surviving life-saving stations on the Pacific Coast. Positioned along a notoriously treacherous stretch of coastline known as the "Graveyard of the Pacific," the station was constructed by the U.S. Life-Saving Service to safeguard mariners navigating the hazardous waters near the mouth of the Columbia River. Operating during an era of bustling maritime commerce, the station's resident keeper and crew of surfmen performed daring rescues using specialized surfboats and beach apparatus, saving countless lives from shipwrecks until the station was decommissioned in 1947.

Architecturally, the complex is a remarkably intact representation of the standardized, Shingle-style designs utilized by the U.S. Life-Saving Service in the early 20th century. The property features the main two-story station house, which served as the keeper's quarters and administrative hub, alongside supporting structures such as the original boathouse. In 1915, the station transitioned to the newly formed U.S. Coast Guard, continuing its vital search-and-rescue and coastal defense missions through both World Wars. Today, the Klipsan Beach Life Saving Station stands as a rare physical monument to the bravery of early coastal rescue crews and the evolution of federal maritime safety in the Pacific Northwest.