Port Orford, OR Coastal Erosion Rate
Shoreline change 4.9 miles north of Port Orford, OR
4.9 miles north of Port Orford, OR, the coast is advancing, not retreating, at a measured 0.53 feet a year, sediment accumulating faster than any erosion USGS recorded here. At that rate, the shoreline has gained roughly 5.3 feet over the last decade.
The grain of this number
USGS surveys the coast in transects spaced a few hundred feet apart; this page groups the nearest ones into a single ~3.5-mile reading for the stretch closest to Port Orford, OR, rather than showing one arbitrary line. Segment center: 42.82, -124.53. USGS's Pacific Northwest assessment last surveyed this stretch through 2002-2011, computing the rate with its LRR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
What 0.53 ft/yr means over time
Holding the 0.53 ft/yr accretion rate 4.9 miles north of Port Orford, OR for 25 years would add roughly 13 feet of shoreline, again assuming nothing about the local sediment supply changes.
How solid is this number
39 transects feed this segment's number; 15% of them individually measured retreat. USGS's confidence interval here is ±0.21 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1028 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2012-1008. Sanibel, FL sits at national rank 1176 for growth (2.71 ft/yr), one reference point among the 1211 scored segments, 2626 miles from here. 1.9 miles away, Port Orford, OR is the nearest other measured stretch: also no significant trend.
Port Orford, OR on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.