Westhaven-Moonstone, CA Coastal Erosion Rate
Shoreline change 2.8 miles southwest of Westhaven-Moonstone, CA
Unusual good news for this stretch: the shoreline 2.8 miles southwest of Westhaven-Moonstone, CA has grown by a measured 1.85 feet a year on average, per USGS's long-term transect data for this section. At that rate, the shoreline has gained roughly 18.5 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 Westhaven-Moonstone, CA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 41.00°N, 124.11°W. USGS's California assessment last surveyed this stretch through 1852-2016, computing the rate with its LRR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
25 years at this rate
Holding the 1.85 ft/yr accretion rate 2.8 miles southwest of Westhaven-Moonstone, CA for 25 years would add roughly 46 feet of shoreline, again assuming nothing about the local sediment supply changes.
Where this fits nationally
111 transects feed this segment's number; 0% of them individually measured retreat. The published margin on this reading runs ±0.43 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1151 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. Rank 995 nationally for growth belongs to Beach Haven, NJ, 2594 miles from this stretch, measured at 0.4 ft/yr, 0.2x this stretch's rate. 2.2 miles up the coast, McKinleyville, CA shows the same lack of a significant trend.
Not this whole stretch, just Westhaven-Moonstone itself: the Coastal Change Hazards Portal is USGS's own live version of this data.