Del Mar, CA Coastal Erosion Rate
Shoreline change 1 miles south of Del Mar, CA
1 miles south of Del Mar, CA: USGS's transects didn't pick up a trend here that beats the survey's own uncertainty. That's the majority case nationally, and for this stretch specifically it means the coast is holding, not that the data failed to find anything.
The grain of this number
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 Del Mar, CA. Centered near 32.95°N, 117.27°W. Survey years: 1852-2016, method LRR, from USGS's California 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.
How solid is this number
This reading comes from 110 individual transects averaged together, 85% of which measured erosion rather than growth. The published margin on this reading runs ±0.23 ft/yr. Taken at face value, this segment's raw -0.12 ft/yr reading would land it 621 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. Quinby, VA sits at national rank 1184 for growth (3.29 ft/yr), one reference point among the 1211 scored segments, 2349 miles from here. Solana Beach, CA, 2.4 miles off, is the adjacent measured stretch, itself no significant trend.
Del Mar, CA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.