Port Mansfield, TX Coastal Erosion Rate
Shoreline change 23.1 miles north of Port Mansfield, TX
23.1 miles north of Port Mansfield, 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 Port Mansfield, TX. Centered near 26.90°N, 97.39°W. 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
Averaging 110 separate transects produced this segment's rate, with 58% individually reading as erosion, rather than relying on any single survey line. USGS's confidence interval here is ±0.38 ft/yr. Taken at face value, this segment's raw -0.04 ft/yr reading would land it 721 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: Huntington Beach, CA, 1316 miles away, ranks 993 of 1211 nationally for growth, 0.39 ft/yr. Port Mansfield, TX, 3.5 miles off, is the adjacent measured stretch, itself no significant trend.
Port Mansfield, TX on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.