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Map of SS J.M. Allmendinger Wreck
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Boat entry

SS J.M. Allmendinger Wreck

Wisconsin, United States
Open Water suggestedShallow surge and waves over the site3–4 m depthBoat entry

Boat dive — see Entry & access.

SS J.M. Allmendinger Wreck at a glance

SS J.M. Allmendinger Wreck is a boat dive site in Wisconsin, United States with depths of 3–4 m (10–13 ft). Typically most favorable Sep · from 3 years of archive data. Divers commonly see Round goby. Check the latest conditions and entry details before you go.

Wind model · graded 4h ago
—

Tap a factor for its source and model point

Site hazards: Shallow surge and waves over the site · Low visibility common close to shore · Limited public shore access along the bluffs

All 3 hazards ↓

Dive windows this week

Best: Tue
Fri19:00–20:00
Sat7:00–9:00
Sun7:00–20:00
Mon7:00–20:00
Tue13:00–20:00
Wed8:00–16:00
Thu7:00–16:00

Favorable windowModerate window— no window

First light 5:58 · Sunrise 6:27 · Sunset 19:09

Source: Open-Meteo wind · graded 4h ago

Forecast only — always assess conditions on site.

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Best time: Calm summer days with offshore winds.

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. Jan83% 11 kn
  2. Feb71% 12 kn
  3. Mar66% 12 kn
  4. Apr63% 13 kn
  5. May80% 11 kn
  6. Jun79% 11 kn
  7. Jul91% 9 kn
  8. Aug91% 10 kn
  9. Sep93% 9 kn
  10. Oct81% 11 kn
  11. Nov81% 11 kn
  12. Dec83% 11 kn

September hastypically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life seen at this site

Species noted at this site — not a promise of what you’ll encounter.

Species seen here

Fills & rentals nearby

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated July 2026

Site details

The steambarge J.M. Allmendinger went ashore near Fox Point in a November 1895 gale and blizzard while running lumber to Milwaukee. Her keel, keelson and floors lie intact with scattered hull fragments, rudder and boiler in just 12 feet of water about 1,035 feet off the Mequon shoreline south of Concordia University. The shallow, NRHP-listed site is an easy kayak-supported dive or snorkel on calm days.

boatwreck

Shallow surge and waves over the site

Low visibility common close to shore

Limited public shore access along the bluffs — kayak/boat approach is standard

Reviews

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