NBM Dive Site Resource
Rosinco
Kenosha, Wisconsin, United States
TECHNICAL DIVE ONLY — Private yacht wreck off Kenosha resting at technical-diving depth in Lake Michigan.
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Historic Photograph
Aquatic life at this dive site
What divers may encounter
Three reviewed connections are featured here. Sightings vary by season, conditions, and chance, so they are never guaranteed.
Lake Trout
Salvelinus namaycushRosinco rests upright in roughly 170 to 180 feet of Lake Michigan water. NOAA identifies lake trout in Wisconsin Shipwreck Coast waters and notes that wreck structures provide foraging habitat for predatory fish.
Knepp Timothy, U.S. Fish and Wildlife ServiceOpen Aquatic Life Profile →
Burbot
Lota lotaNOAA reports that burbot often appear at deeper Great Lakes wrecks. Divers may encounter one close to Rosinco's hull or bottom, but sightings are never guaranteed.
USFWS Mountain-PrairieOpen Aquatic Life Profile →
Round Goby
Neogobius melanostomusNOAA identifies round goby among Lake Michigan bottom-habitat fishes and as common around Great Lakes hard structure. Look along the lower hull and adjoining lakebed.
Peter van der SluijsOpen Aquatic Life Profile →
Site media
Photographs
Three views rotate from the published gallery on each visit.
Contributor media
Dive videos
Three featured video positions are reserved on every profile.Recent field observations
Diver-reported temperatures
Automatically checked observations from dives during the past 14 days. Three reports are visible at a time; scroll for more.A report that passes the automatic checks will appear here with the dive date, diver’s display name, and temperatures at each depth.
Reports are automatically checked for plausible dates, depths, and temperatures. They are observations, not forecasts; confirm conditions before diving.
Seasonal planning reference
Typical monthly conditions
Long-term averages, not a forecast. Actual air and water conditions can change quickly and may vary across the site.Moderate-confidence match — Matched by documented Great Lakes port/area. Air and surface-water values are regional planning averages. No bottom-water line is published because a comparable depth-specific record has not yet been verified.
| Month | Average air | Surface water | Bottom water | Bottom measurement depth |
|---|---|---|---|---|
| Jan | 24.0°F / -4.4°C | 35.2°F / 1.8°C | No reliable record | — |
| Feb | 27.1°F / -2.7°C | 36.6°F / 2.6°C | No reliable record | — |
| Mar | 36.4°F / 2.4°C | 37.8°F / 3.2°C | No reliable record | — |
| Apr | 46.3°F / 7.9°C | 38.3°F / 3.5°C | No reliable record | — |
| May | 57.1°F / 13.9°C | 42.5°F / 5.8°C | No reliable record | — |
| Jun | 67.6°F / 19.8°C | 53.7°F / 12.1°C | No reliable record | — |
| Jul | 73.3°F / 22.9°C | 68.2°F / 20.1°C | No reliable record | — |
| Aug | 72.3°F / 22.4°C | 72.2°F / 22.3°C | No reliable record | — |
| Sep | 65.0°F / 18.3°C | 68.4°F / 20.2°C | No reliable record | — |
| Oct | 53.0°F / 11.7°C | 58.5°F / 14.7°C | No reliable record | — |
| Nov | 40.4°F / 4.7°C | 49.0°F / 9.4°C | No reliable record | — |
| Dec | 29.5°F / -1.4°C | 43.7°F / 6.5°C | No reliable record | — |
Wisconsin State Climatology Office — Milwaukee Climate Data
1991–2020 climate normalsReview source ↗NOAA NCEI Coastal Water Temperature Guide — Station 45007
Historical monthly station averagesReview source ↗Bottom temperature is never inferred from surface temperature. A blank month means no reliable depth-specific average is available. Data reviewed 2026-08-26.
Why divers know this place
Highlights
Distinctive private-yacht wreck preserved in cold freshwater.
Shipwreck-only module
The wreck
This section appears only on shipwreck records and brings the vessel, its loss, present condition, access, and responsible wreck-diving considerations into one place.
- Vessel type
- Steel diesel yacht
- Year sunk
- 1928
- Vessel length
- 93 ft
- Cause of loss
- Reported collision with floating timber, September 19, 1928
- Wreck orientation
- Upright
- Present condition
- Substantially intact yacht.
- Penetration guidance
- Interior spaces are overhead environments. Entry requires appropriate wreck training, equipment and a planned exit; depth alone does not establish suitability.
History and significance
Previously known as Georgiana III and Whitemarsh, the yacht became Rosinco in 1925. It sank off Kenosha after a nighttime impact attributed to floating timber. All seven aboard survived. The wreck illustrates private diesel-yacht construction and use.
Plan the trip
Dive boats that visit this wreck
Before you arrive
Access notes
Boat-access site off Kenosha; verify current mooring and charter availability.
Plan within your training
Conditions and hazards
Cold water, technical depth, decompression obligation, entanglement and overhead/penetration hazards. Depth creates decompression obligations; cold water, darkness or limited visibility, entanglement and overhead wreckage require site-specific technical planning.
Independent resource notice
This record is a starting point for independent verification. Access, closures, moorings, weather, currents, depth, visibility, operator availability, and site conditions can change without notice. Confirm current information with the responsible operator, property owner, managing authority, or another qualified local source before planning or attempting a dive.