Grand Isle, LA Coastal Erosion Rate
Shoreline change 1.9 miles west of Grand Isle, LA
The coast 1.9 miles west of Grand Isle, LA shows no statistically significant trend either way. USGS's transects measured a rate here, but it's smaller than the survey's own margin of error for this stretch, so calling it "eroding" or "growing" would overstate what the data actually shows.
What this reading actually covers
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Grand Isle, LA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 29.21°N, 90.06°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.
What backs this reading up
55 transects feed this segment's number; 100% of them individually measured retreat. USGS's confidence interval here is ±4.07 ft/yr. Taken at face value, this segment's raw -2.15 ft/yr reading would land it 126 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: Carpinteria, CA, 1756 miles away, ranks 942 of 1211 nationally for growth, 0.23 ft/yr. 2.1 miles away, Grand Isle, LA is the nearest other measured stretch: also no significant trend.
Grand Isle, LA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.