Upper Grand Lagoon, FL Coastal Erosion Rate
Shoreline change 1.2 miles northwest of Upper Grand Lagoon, FL
1.2 miles northwest of Upper Grand Lagoon, FL: 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.
What "Upper Grand Lagoon" means on this page
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 Upper Grand Lagoon, FL. Centered near 30.18°N, 85.76°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.
How solid is this number
This reading comes from 45 individual transects averaged together, 2% of which measured erosion rather than growth. Uncertainty on this specific number: 0.29 ft/yr either side. Taken at face value, this segment's raw 0.27 ft/yr reading would land it 956 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2004-1089. Rank 1210 nationally for growth belongs to Chincoteague, VA, 797 miles from this stretch, measured at 11.04 ft/yr. 2 miles up the coast, Upper Grand Lagoon, FL shows the same lack of a significant trend.
Not this whole stretch, just Upper Grand Lagoon itself: the Coastal Change Hazards Portal is USGS's own live version of this data.