Two registered NOAA historical survey maps show one continuous Hog Island in 1884 and the mapped Hurricane Pass four to five years after the 1921 breach.
Compare NOAA survey sheet T-1698 from 1884 with survey sheet T-4219 from field work in October 1925 and June-July 1926. Both frames use one grid-registered viewport.
Earlier: NOAA Office of Coast Survey, 1884; day and month unknown. Later: NOAA Office of Coast Survey, October 1925 and June-July 1926. The control changes only how much of the aligned later frame is visible.
The clearest difference is categorical rather than measurable. The 1884 sheet draws one continuous barrier landform through the later pass location. The 1925-1926 sheet draws an opening and labels it Hurricane Pass. Read that pair with the dated USGS record, not as a fine shoreline or inlet-size comparison.
Visible in the pair: T-1698 draws and labels one continuous Hog Island through the location where the later sheet shows Hurricane Pass.
Established by the project record: The NOAA title and index identify this as the 1884 survey sheet T-1698.
This is an 1884 surveyed map condition, not a pre-storm aerial or a claim about every intervening year.
Sources: NOAA T-sheet archive index
Visible in the pair: T-4219 draws an opening through Hog Island and labels it Hurricane Pass.
Established by the project record: USGS identifies the 1921 hurricane breach as the formation of Hurricane Pass.
The sheet does not establish the opening's immediate post-storm dimensions, depth, shoreline position, or navigability.
Sources: USGS location history
Visible in the pair: The T-4219 title block records October 1925 and June-July 1926 field work.
Established by the project record: USGS records that Hurricane Pass continued widening and deepening through 1926.
The comparison distinguishes the 1921 causal record from the condition mapped four to five years later; it does not isolate each year of change.
Sources: USGS inlet history
USGS records that a 1921 hurricane broke through Hog Island to form Hurricane Pass, separating the north end of Caladesi from the land now called Honeymoon Island. USGS also records continued widening and deepening through 1926. The later map therefore shows a condition surveyed four to five years after the breach, not immediate storm aftermath.
Primary sources: USGS Open-File Report 99-506 location history · USGS Open-File Report 94-565 inlet history
This story is generated only after both frame records pass the local provenance, rights, checksum, and viewport validator.
Authoritative metadata · Source, rights, controls, transform, and checksum manifest · Rights record · Source scan
Authoritative metadata · Source, rights, controls, transform, and checksum manifest · Rights record · Source scan
Coastline Memory is historical context. Use the launch guide for access details and the live map for current conditions.
Open the Honeymoon Island launch guide · Open the Dunedin Causeway launch guide
