Beaver Island ArchiveA primary-source archive & encyclopedia45°40′N 85°33′W · Lake Michigan
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Reef

Dahlia Shoals

Also Dahlia Shoal

Draft — sources verified, prose evolving

Locator map: Dahlia Shoals highlighted within the Beaver Island archipelago
Locator plate © OpenStreetMap contributors (ODbL 1.0); depths NOAA; names USGS GNIS. How the plates are drawn.
TypeReef
Coordinates45.6271° N, 85.2034° WGoogle MapsDownload KML
WithinBeaver Island archipelago
ErasModern era
On this page
Locator map: Dahlia Shoals highlighted within the Beaver Island archipelago
Locator plate © OpenStreetMap contributors (ODbL 1.0); depths NOAA; names USGS GNIS. How the plates are drawn.
Reef
Coordinates
45.6271° N, 85.2034° WGoogle MapsDownload KML
Eras
Modern era
Concepts
maritimeshippingenvironmentfishingconservation
Within
Beaver Island archipelago

Summary

Dahlia Shoals are an offshore Lake Michigan reef or shoal area represented in the project’s northern-Lake-Michigan bathymetry holdings and in the Great Lakes Fishery Commission’s East Beaver Group management vocabulary.

Evidence and limits

The held USGS metadata records a 2001 lidar survey titled Dahlia Shoals; the GLFC guide separately names Dahlia Shoal in a 2008 lake-trout rehabilitation grouping. These sources establish the source-specific name and survey/management contexts. A held 26 July 2026 NOAA Coast Pilot revision also describes a 14-foot least depth and a buoy relative to nearby Iles aux Galets. It does not establish a present reef boundary, a coordinate, ownership, Indigenous name, historical fishery record, or an equivalence with Iles aux Galets.

See also

Read the document

92 pages, rendered from the held scan.

Dahlia Shoals — p. 1
Page 1 of 92U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise, “Dahlia Shoals, Lake Michigan, Michigan,” edition 1.1 (2001), published in USGS Open-File Report 03-120 (2003).Open the page image · Download this page
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Sources

  1. Described in this archive: Northern Lake Michigan reef and coastal bathymetry, USGS OFR 03-120.
    Held FGDC metadata identifies an August 2001 SHOALS lidar bathymetry survey of Dahlia Shoals for bathymetry and albedo habitat studies. Its coverage and sounding data are not a reef boundary, a current navigation chart, ownership evidence, or a present habitat assessment.
    federal · noaa_bathymetry · usgs_ofr_2003_120 · metadata · dahliameta
  2. Described in this archive: GLFC guide for Lake Michigan lake-trout rehabilitation, 2008.
    Names Dahlia Shoal in the East Beaver Group for lake-trout rehabilitation. The guide distinguishes its Dahlia Shoal wording from Iles aux Galets; this article does not merge them as aliases or assert a group boundary.
    geology · publications · glfc_2008_lake_trout
  3. Described in this archive: NOAA Coast Pilot 6, chapter 11, 26 July 2026 capture.
    The held 2 August 2026 capture describes Dahlia Shoal relative to Ile aux Galets, reports a 14-foot least depth, and notes a buoy. This dated, revisable navigational description is not converted into a coordinate, boundary, current condition, or safe-navigation advice.
    federal · noaa_coast_pilot · noaa-coast-pilot-6-chapter-11-2026-08-02
  4. Representative point follows the Google Maps Dahlia Shoal label; two nearby map results differ slightly, so this is not treated as the shoal’s boundary, least-depth position, or a navigation point.

Added 2 August 2026. Recent changes

Cite this article

Beaver Island Archive, “Dahlia Shoals”, https://beaverislandarchive.org/places/dahlia-shoals/, accessed [date], citing U.S. Army Engineer Joint Airborne Lidar Bathymetry Technical Center of Expertise, “Dahlia Shoals, Lake Michigan, Michigan,” edition 1.1 (2001), published in USGS Open-File Report 03-120 (2003). (and 3 further sources listed on the page).

Last revised 2026-08-02. Fill in [date] with the date you read it — this page is static and cannot know that.

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