Port Mansfield, TX Coastal Erosion Rate
Is the coast eroding 19.7 miles north of Port Mansfield, TX?
Nothing alarming measured 19.7 miles north of Port Mansfield, TX: whatever shift USGS's transects picked up here is too small to call reliably one way or the other, which this site reports as "no significant trend" rather than forcing a direction.
What this reading actually covers
Port Mansfield, TX is the nearest named place, 19.7 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: 26.85, -97.38. Survey years: 2001, method LRR, from USGS's Gulf of Mexico 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.
Where this fits nationally
107 transects feed this segment's number; 31% of them individually measured retreat. USGS's confidence interval here is ±0.56 ft/yr. The unadjusted figure here, 0.1 ft/yr, would place it 851 of 1211 if ranked directly - but an unreliable rank isn't a useful one, which is exactly why "no significant trend" is the headline instead. Source: USGS Open-File Report 2004-1089. For scale: Kennebunkport, ME, 1887 miles away, ranks 933 of 1211 nationally for growth, 0.22 ft/yr. 1.9 miles away, Port Mansfield, TX is the nearest other measured stretch: also no significant trend.
Not this whole stretch, just Port Mansfield itself: the Coastal Change Hazards Portal is USGS's own live version of this data.