Lake Sherwood, CA Coastal Erosion Rate
Shoreline change 6.8 miles southwest of Lake Sherwood, CA
0.23 feet a year: that is the measured retreat rate USGS's transects show for the coast 6.8 miles southwest of Lake Sherwood, CA, averaged across the full historical record surveyed here. At that rate, the shoreline has lost roughly 2.3 feet over the last decade.
The grain of this number
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Lake Sherwood, CA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 34.05°N, 118.95°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.
25 years at this rate
If 0.23 ft/yr holds for the next 25 years, the coast 6.8 miles southwest of Lake Sherwood, CA would retreat roughly 6 more feet, a projection, not a certainty: erosion rates shift with storms, sediment supply and any armoring built in the meantime.
Where this fits nationally
Averaging 96 separate transects produced this segment's rate, with 98% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.11 ft/yr. This segment ranks 478 of 1211 measured US coastal segments, ordered from fastest erosion to fastest growth. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. Rank 50 nationally for erosion belongs to Empire, LA, 1741 miles from this stretch, measured at 5.31 ft/yr, many times over this stretch's own rate. Lake Sherwood, CA, 3 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Lake Sherwood: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.