Coronado, CA Coastal Erosion Rate
What USGS measures 1.7 miles northwest of Coronado, CA
The coast 1.7 miles northwest of Coronado, CA is actually gaining ground, not losing it: USGS's transects measure 1.69 feet of accretion a year here, sediment building up rather than washing away. At that rate, the shoreline has gained roughly 16.9 feet over the last decade.
The grain of this number
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 Coronado, CA. Centered near 32.68°N, 117.17°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.
25 years at this rate
Holding the 1.69 ft/yr accretion rate 1.7 miles northwest of Coronado, CA for 25 years would add roughly 42 feet of shoreline, again assuming nothing about the local sediment supply changes.
Where this fits nationally
Averaging 11 separate transects produced this segment's rate, with 0% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.5 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1147 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. For scale: Atlantic City, NJ, 2410 miles away, ranks 1159 of 1211 nationally for growth, 2.07 ft/yr, 1.2x this stretch's rate. Coronado, CA, 1.7 miles off, is the adjacent measured stretch, reading accretion (beach growing) at 2.04 ft/yr.
Coronado, CA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.