Marina, CA Coastal Erosion Rate
Shoreline change 1.8 miles northwest of Marina, CA
The coast 1.8 miles northwest of Marina, CA has been retreating at a measured 0.72 feet a year, USGS's own long-term rate for this stretch, built from historical shoreline positions rather than a single survey. At that rate, the shoreline has lost roughly 7.2 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 Marina, CA. Centered near 36.70°N, 121.81°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
If 0.72 ft/yr holds for the next 25 years, the coast 1.8 miles northwest of Marina, CA would retreat roughly 18 more feet, a projection, not a certainty: erosion rates shift with storms, sediment supply and any armoring built in the meantime.
How solid is this number
112 transects feed this segment's number; 100% of them individually measured retreat. The published margin on this reading runs ±0.31 ft/yr. Sorted from fastest erosion to fastest growth across all 1211 measured segments nationally, this one lands at 240. Source: USGS National Shoreline Change data release (ScienceBase, DOI 10.5066/P94J0K7Z), Kratzmann 2024 / Data Report 1187. Rank 286 nationally for erosion belongs to Big Lagoon, CA, 330 miles from this stretch, measured at 0.55 ft/yr, 0.8x this stretch's rate. 2.4 miles away, Marina, CA is the nearest other measured stretch: slight erosion at 0.94 ft/yr.
One address near Marina: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.