The Lost City of West Linn: How the 1861 Great Flood Wiped Out Linn City in a Single Night

1. Robert Moore’s Vision: Founding Linn City (1843)

In 1843, Pennsylvania native and pioneer Robert Moore purchased a land claim known as "Robin's Nest" on the west bank of Willamette Falls directly opposite Oregon City. Moore surveyed a competing townsite, naming it "Linn City" in honor of U.S. Senator Lewis F. Linn of Missouri, champion of pioneer land rights.

By the 1850s, Linn City was a thriving river hub boasting a post office, multiple sawmills, a grist mill, a boatyard, a large commercial wharf, and dozens of residences clinging to the basalt ledges along the river.

2. The Night the River Rose: December 4, 1861

Late November 1861 brought heavy snow to the Cascade Range, immediately followed by warm tropical "Pineapple Express" rains. The entire Willamette river basin rapidly flooded as thousands of snowmelt torrents converged on the gorge.

On the night of December 4, 1861, the Willamette River rose an unprecedented 55 feet above low-water mark. Raging torrents bearing uprooted trees and floating buildings tore into Linn City. Within hours, Robert Moore's flour mill, sawmills, warehouses, and shoreline houses were lifted from their stone foundations and swept over the roaring falls. By morning, Linn City had literally ceased to exist.

3. From Ruins to West Linn

Financially ruined and heartbroken, Robert Moore passed away just months after the disaster in 1862. The waterfront town of Linn City was never rebuilt on the flood-prone lower basalt flats. Instead, subsequent development moved higher onto the hillside plateau.

Decades later, the town of Willamette grew around the new pulp mills, eventually merging with neighboring settlements to formally incorporate as the City of West Linn in 1913, honoring the heritage of Robert Moore's lost dream.