Bayshore, OR Coastal Erosion Rate
Is the coast eroding 0.5 miles north of Bayshore, OR?
The coast 0.5 miles north of Bayshore, OR is actually gaining ground, not losing it: USGS's transects measure 1.23 feet of accretion a year here, sediment building up rather than washing away. At that rate, the shoreline has gained roughly 12.3 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 Bayshore, OR into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 44.45°N, 124.08°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 1.23 ft/yr accretion rate 0.5 miles north of Bayshore, OR for 25 years would add roughly 31 feet of shoreline, again assuming nothing about the local sediment supply changes.
What backs this reading up
This reading comes from 96 individual transects averaged together, 0% of which measured erosion rather than growth. USGS's confidence interval here is ±0.85 ft/yr. Sorted from fastest erosion to fastest growth across all 1211 measured segments nationally, this one lands at 1126. Source: USGS Open-File Report 2012-1008. For scale: Saco, ME, 2621 miles away, ranks 962 of 1211 nationally for growth, 0.3 ft/yr, 0.2x this stretch's rate. 2.1 miles away, Waldport, OR is the nearest other measured stretch: also no significant trend.
Bayshore, OR on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.