Copalis Beach, WA Coastal Erosion Rate
What USGS measures 1.9 miles northwest of Copalis Beach, WA
Unusual good news for this stretch: the shoreline 1.9 miles northwest of Copalis Beach, WA has grown by a measured 0.99 feet a year on average, per USGS's long-term transect data for this section. At that rate, the shoreline has gained roughly 9.9 feet over the last decade.
What "Copalis Beach" means on this page
Copalis Beach, WA is the nearest named place, 1.9 miles away, to a ~3.5-mile stretch of coast USGS has surveyed - the reading below covers that whole stretch, not a single property in it. Segment center: 47.15, -124.18. 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.
What 0.99 ft/yr means over time
Holding the 0.99 ft/yr accretion rate 1.9 miles northwest of Copalis Beach, WA for 25 years would add roughly 25 feet of shoreline, again assuming nothing about the local sediment supply changes.
How solid is this number
This reading comes from 101 individual transects averaged together, 0% of which measured erosion rather than growth. Uncertainty on this specific number: 0.55 ft/yr either side. Sorted from fastest erosion to fastest growth across all 1211 measured segments nationally, this one lands at 1105. Source: USGS Open-File Report 2012-1008. Inwood, NY sits at national rank 1093 for growth (0.91 ft/yr), one reference point among the 1211 scored segments, 2505 miles from here. 2.4 miles up the coast, Copalis Beach, WA shows 3.87 ft/yr of accreting.
Copalis Beach, WA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.