Westport, WA Coastal Erosion Rate
Shoreline change right at Westport, WA
right at Westport, WA, the coast is advancing, not retreating, at a measured 1.25 feet a year, sediment accumulating faster than any erosion USGS recorded here. At that rate, the shoreline has gained roughly 12.5 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 Westport, WA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 46.89°N, 124.12°W. The survey behind it runs to 2002-2011, in USGS's Pacific Northwest assessment, using the LRR method. Shoreline surveys aren't repeated every year, so this is the most recent long-term measurement USGS has published for this coast, not a live reading.
25 years at this rate
Holding the 1.25 ft/yr accretion rate right at Westport, WA for 25 years would add roughly 31 feet of shoreline, again assuming nothing about the local sediment supply changes.
How solid is this number
59 transects feed this segment's number; 0% of them individually measured retreat. USGS's confidence interval here is ±1.02 ft/yr. This segment ranks 1128 of 1211 measured US coastal segments, ordered from fastest erosion to fastest growth. Source: USGS Open-File Report 2012-1008. Atlantic City, NJ sits at national rank 1159 for growth (2.07 ft/yr), one reference point among the 1211 scored segments, 2516 miles from here. 1.1 miles away, Westport, WA is the nearest other measured stretch: also no significant trend.
Not this whole stretch, just Westport itself: the Coastal Change Hazards Portal is USGS's own live version of this data.