Daly City, CA Coastal Erosion Rate
Shoreline change 4.1 miles northwest of Daly City, CA
4.1 miles northwest of Daly City, 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 this reading actually covers
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 Daly City, CA. Centered near 37.75°N, 122.51°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.
What backs this reading up
112 transects feed this segment's number; 66% of them individually measured retreat. USGS's confidence interval here is ±0.68 ft/yr. Taken at face value, this segment's raw -0.21 ft/yr reading would land it 498 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. Gearhart, OR sits at national rank 1187 for growth (3.64 ft/yr), one reference point among the 1211 scored segments, 582 miles from here. Daly City, CA, 1.8 miles off, is the adjacent measured stretch, itself no significant trend.
Daly City, CA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.