Broadmoor, CA Coastal Erosion Rate
Is the coast eroding 1.2 miles northwest of Broadmoor, CA?
Averaged across every transect USGS ran 1.2 miles northwest of Broadmoor, CA, the shoreline has been moving inland at 0.61 feet a year, a real measured rate, not a regional estimate applied to this stretch. At that rate, the shoreline has lost roughly 6.1 feet over the last decade.
What "Broadmoor" means on this page
Broadmoor, CA is the nearest named place, 1.2 miles away, to a ~3.5-mile stretch of coast USGS has surveyed - the reading below covers that whole stretch, not a single property in it. Segment center: 37.70, -122.50. 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 0.61 ft/yr means over time
Run 1.2 miles northwest of Broadmoor, CA's 0.61 ft/yr rate forward 25 years and it implies about 15 feet of further retreat, assuming nothing changes, which is exactly the assumption a seawall or nourishment project exists to break.
Where this fits nationally
This reading comes from 112 individual transects averaged together, 100% of which measured erosion rather than growth. USGS's confidence interval here is ±0.27 ft/yr. This segment ranks 265 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. For scale: Chatham, MA, 2763 miles away, ranks 66 of 1211 nationally for erosion, 4.33 ft/yr, 7.1x this stretch's rate. 3.5 miles up the coast, Daly City, CA shows the same lack of a significant trend.
One address near Broadmoor: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.