Seaside, OR Coastal Erosion Rate
Shoreline change 0.4 miles southwest of Seaside, OR
The coast 0.4 miles southwest of Seaside, OR is actually gaining ground, not losing it: USGS's transects measure 1.36 feet of accretion a year here, sediment building up rather than washing away. At that rate, the shoreline has gained roughly 13.6 feet over the last decade.
The grain of this number
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Seaside, OR into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 45.99°N, 123.93°W. Survey years: 2002-2011, method LRR, from USGS's Pacific Northwest shoreline-change assessment. That's how current the data is here, real, but not a live feed, since a shoreline survey is a major undertaking, not an annual check-in.
25 years at this rate
Holding the 1.36 ft/yr accretion rate 0.4 miles southwest of Seaside, OR for 25 years would add roughly 34 feet of shoreline, again assuming nothing about the local sediment supply changes.
How solid is this number
Averaging 42 separate transects produced this segment's rate, with 0% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.57 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1136 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2012-1008. Rank 1152 nationally for growth belongs to Santa Monica, CA, 876 miles from this stretch, measured at 1.85 ft/yr, 1.4x this stretch's rate. 1.7 miles up the coast, Seaside, OR shows 1.99 ft/yr of accreting.
Seaside, OR on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.