Port Mansfield, TX Coastal Erosion Rate
Shoreline change 16.4 miles north of Port Mansfield, TX
Good news, and an honest one: USGS's data can't distinguish this stretch, 16.4 miles north of Port Mansfield, TX, from a flat trend. Whatever small movement it measured here is statistical noise, not a reliable direction, so none is claimed.
What this reading actually covers
USGS surveys the coast in transects spaced a few hundred feet apart; this page groups the nearest ones into a single ~3.5-mile reading for the stretch closest to Port Mansfield, TX, rather than showing one arbitrary line. Segment center: 26.80, -97.37. 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.
What backs this reading up
Averaging 104 separate transects produced this segment's rate, with 94% individually reading as erosion, rather than relying on any single survey line. USGS's confidence interval here is ±0.54 ft/yr. The unadjusted figure here, -0.24 ft/yr, would place it 451 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. Rank 1021 nationally for growth belongs to Costa Mesa, CA, 1312 miles from this stretch, measured at 0.48 ft/yr. 1.8 miles away, Port Mansfield, TX is the nearest other measured stretch: also no significant trend.
One address near Port Mansfield: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.