Lake Sherwood, CA Coastal Erosion Rate
Is the coast eroding 7.9 miles southwest of Lake Sherwood, CA?
7.9 miles southwest of Lake Sherwood, 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 "Lake Sherwood" 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 Lake Sherwood, CA. Centered near 34.07°N, 119.00°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.
What backs this reading up
Averaging 54 separate transects produced this segment's rate, with 94% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.17 ft/yr. Taken at face value, this segment's raw -0.14 ft/yr reading would land it 591 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 1161 nationally for growth belongs to Tiki Island, TX, 1457 miles from this stretch, measured at 2.15 ft/yr. 1.6 miles up the coast, Casa Conejo, CA shows the same lack of a significant trend.
Not this whole stretch, just Lake Sherwood itself: the Coastal Change Hazards Portal is USGS's own live version of this data.