Santiago, WA Coastal Erosion Rate
Is the coast eroding 0.8 miles west of Santiago, WA?
Unusual good news for this stretch: the shoreline 0.8 miles west of Santiago, WA has grown by a measured 1.48 feet a year on average, per USGS's long-term transect data for this section. At that rate, the shoreline has gained roughly 14.8 feet over the last decade.
What "Santiago" means on this page
This is a roughly 3.5-mile stretch of coast, not one address or parcel - USGS's own transects run every few hundred feet, but that's finer than any one property needs, so this page reports the stretch nearest Santiago, WA. Centered near 47.30°N, 124.25°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 1.48 ft/yr accretion rate 0.8 miles west of Santiago, WA for 25 years would add roughly 37 feet of shoreline, again assuming nothing about the local sediment supply changes.
What backs this reading up
96 transects feed this segment's number; 29% of them individually measured retreat. The published margin on this reading runs ±0.63 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1139 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2012-1008. For scale: Camp Pendleton South, CA, 1034 miles away, ranks 1091 of 1211 nationally for growth, 0.9 ft/yr, 0.6x this stretch's rate. Taholah, WA, 1.9 miles off, is the adjacent measured stretch, reading slight erosion at 0.57 ft/yr.
Santiago, WA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.