Camp Pendleton South, CA Coastal Erosion Rate
Shoreline change 3.2 miles northwest of Camp Pendleton South, CA
3.2 miles northwest of Camp Pendleton South, CA, the coast is advancing, not retreating, at a measured 0.9 feet a year, sediment accumulating faster than any erosion USGS recorded here. At that rate, the shoreline has gained roughly 9 feet over the last decade.
What this reading actually covers
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 Camp Pendleton South, CA, rather than showing one arbitrary line. Segment center: 33.26, -117.44. 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.
What 0.9 ft/yr means over time
Holding the 0.9 ft/yr accretion rate 3.2 miles northwest of Camp Pendleton South, CA for 25 years would add roughly 23 feet of shoreline, again assuming nothing about the local sediment supply changes.
What backs this reading up
This reading comes from 87 individual transects averaged together, 0% of which measured erosion rather than growth. USGS's confidence interval here is ±0.29 ft/yr. Sorted from fastest erosion to fastest growth across all 1211 measured segments nationally, this one lands at 1091. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. For scale: Westhaven-Moonstone, CA, 649 miles away, ranks 1151 of 1211 nationally for growth, 1.85 ft/yr, 2.1x this stretch's rate. Camp Pendleton South, CA, 2.1 miles off, is the adjacent measured stretch, reading slight accretion (beach growing) at 0.98 ft/yr.
Not this whole stretch, just Camp Pendleton South itself: the Coastal Change Hazards Portal is USGS's own live version of this data.