Longboat Key, FL Coastal Erosion Rate
Shoreline change 2 miles southeast of Longboat Key, FL
Nothing alarming measured 2 miles southeast of Longboat Key, FL: 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 "Longboat Key" means on this page
Longboat Key, FL is the nearest named place, 2 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: 27.38, -82.62. The survey behind it runs to 2001, in USGS's Gulf of Mexico assessment, using the LRR method. Shoreline surveys aren't repeated every year, so this is the most recent long-term measurement USGS has published for this coast, not a live reading.
Where this fits nationally
Averaging 22 separate transects produced this segment's rate, with 100% individually reading as erosion, rather than relying on any single survey line. Uncertainty on this specific number: 0.71 ft/yr either side. The unadjusted figure here, -0.08 ft/yr, would place it 669 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 962 nationally for growth belongs to Saco, ME, 1306 miles from this stretch, measured at 0.3 ft/yr. Longboat Key, FL, 2 miles off, is the adjacent measured stretch, itself no significant trend.
Longboat Key, FL on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.