Del Mar, CA Coastal Erosion Rate
Is the coast eroding 9.2 miles south of Del Mar, CA?
9.2 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.
What "Del Mar" 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 Del Mar, CA. Centered near 32.83°N, 117.28°W. The survey behind it runs to 1852-2016, in USGS's California 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.
Where this fits nationally
This reading comes from 19 individual transects averaged together, 100% of which measured erosion rather than growth. Uncertainty on this specific number: 0.19 ft/yr either side. Taken at face value, this segment's raw -0.1 ft/yr reading would land it 652 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. Rank 1014 nationally for growth belongs to Kailua, HI, 2593 miles from this stretch, measured at 0.46 ft/yr. Del Mar, 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.