Casmalia, CA Coastal Erosion Rate
What USGS measures 4.5 miles west of Casmalia, CA
Nothing alarming measured 4.5 miles west of Casmalia, CA: whatever shift USGS's transects picked up here is too small to call reliably one way or the other, which this site reports as "no significant trend" rather than forcing a direction.
What this reading actually covers
Casmalia, CA is the nearest named place, 4.5 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: 34.84, -120.61. USGS's California assessment last surveyed this stretch through 1852-2016, 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 backs this reading up
80 transects feed this segment's number; 18% of them individually measured retreat. USGS's confidence interval here is ±0.7 ft/yr. The unadjusted figure here, 0.17 ft/yr, would place it 905 of 1211 if ranked directly - but an unreliable rank isn't a useful one, which is exactly why "no significant trend" is the headline instead. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. Pacific Beach, WA sits at national rank 1100 for growth (0.95 ft/yr), one reference point among the 1211 scored segments, 874 miles from here. Casmalia, CA, 2.6 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Casmalia: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.