Summer Island
island in Delta County, Michigan, USA
Summer Island is an island in Lake Michigan, 2.5 miles (4 km) miles off the southern tip of the Garden Peninsula in the U.S. state of Michigan. It can easily be seen from Fairport, on the southern end of Delta County Road 483, the locally maintained extension of M-183, but is not accessible to the public.
The island is part of the Niagara Escarpment archipelago in northwestern Lake Michigan. Its highest point is 710 feet (217 m) above sea level, and 129 feet (40 m) above the level of the lake. One of its most prominent shoreline features is Gravel Point, a northern headland that stretches toward the Garden Peninsula mainland. More than half the island is owned by the state of Michigan and administered as part of Lake Superior State Forest.
Summer Island site
On the island's northeast side, two shallow points protect Summer Harbor, a small maritime shelter and site of a former settlement. Summer Harbor is adjacent to an archeological landmark listed on the National Register of Historic Places as the Summer Island site. Pottery recovered here indicates that the island may have been inhabited since the Middle Woodland period (circa 1 CE – 500 CE).
During the 19th century, Summer Harbor was a fishing station for the harvesting of lake trout and whitefish, and served as a place to live for a small corps of loggers who harvested the island's timber.
Begin with the source’s own compact description: “Summer Island” is island in Delta County, Michigan, USA. The dossier treats that line as a proposition to test through Summer, Island and island, not as a finished interpretation.
Why this record matters
The phrase “island in Delta County, Michigan, USA” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Aug 20, 2026. The linked authority identifier is Q7637351. The Library of Congress control number is sh2008001272. Authority coordinates are 45.563, -86.636. 1 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Summer Island”, its source revision and the description used here.
- Expand the search: follow Summer Island primary sources, Summer Island archive and Summer research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Summer Island”?
- Which authority defined the place, boundary or structure at the relevant date?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “Summer Island” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.