Rockport, TX Coastal Erosion Rate
What USGS measures 6.9 miles southeast of Rockport, TX
6.9 miles southeast of Rockport, TX: 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.
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 Rockport, TX. Centered near 27.97°N, 96.97°W. USGS's Gulf of Mexico assessment last surveyed this stretch through 2001, 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
8 transects feed this segment's number; 0% of them individually measured retreat. USGS's confidence interval here is ±1.17 ft/yr. Taken at face value, this segment's raw 0.17 ft/yr reading would land it 900 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2004-1089. For scale: Warrenton, OR, 1932 miles away, ranks 1196 of 1211 nationally for growth, 4.64 ft/yr. 2.1 miles away, Rockport, TX is the nearest other measured stretch: also no significant trend.
Rockport, TX on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.