Open-File Report O-09-06: Coastal Erosion Hazard Zones in Southern Clatsop County, Oregon: Seaside to Cape Falcon Publisher: DOGAMI The coast of southern Clatsop County, Oregon has a notorious history of large deep seated landslides that have severely impacted coastal development. In February 1961, heavy precipitation destabilized a 3,000-foot-long by 1,000- foot-wide landslide that closed Ecola State Park. Perhaps more famous is the February 3, 1974, Silver Point landslide that involved over 2 million cubic yards of material, that vertically displaced U.S. Highway 101 by 35 feet and laterally shifted houses near the landslide 50 to 80 feet westward. CD-ROM Price: $ 15.00