Skip to content
Map of SS J.M. Allmendinger Wreck
Add the first photo
Boat entry

SS J.M. Allmendinger Wreck

Wisconsin, United States
Open Water suggestedShallow surge and waves over the site3–4 m (10–13 ft) 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.

Favorable window now· until 18:00 · sunset 17:50

Wind forecast for this hour · 15:00 · run 2 h 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

Tue13:00–18:00 favorable

10 kn wind (10 kn wind)

Wed8:00–18:00 favorable

7 kn wind (7 kn wind)

Thu8:00–10:00 moderate, 10:00–18:00 favorable

8 kn wind (8 kn wind)

Fri8:00–18:00 favorable

6 kn wind (6 kn wind)

Sat8:00–18:00 favorable

7 kn wind (7 kn wind)

Sun8:00–10:00 favorable, 10:00–13:00 moderate, 13:00–18:00 favorable

8 kn wind (8 kn wind)

Mon8:00–18:00 favorable

5 kn wind (5 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wind forecasts. Numbers under each bar are daylight averages.

First light 6:51 · Sunrise 7:20 · Sunset 17:50 · some windows run past sunset

Source: Open-Meteo wind · updated 27 Oct, 12:23 GMT-5

Forecast only — always assess conditions on site.

Compare this weekend’s windows near SS J.M. Allmendinger Wreck

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. January, 83% of days have historically been favorable, wind has typically been 11 knots
  2. February, 71% of days have historically been favorable, wind has typically been 12 knots
  3. March, 66% of days have historically been favorable, wind has typically been 12 knots
  4. April, 63% of days have historically been favorable, wind has typically been 13 knots
  5. May, 80% of days have historically been favorable, wind has typically been 11 knots
  6. June, 79% of days have historically been favorable, wind has typically been 11 knots
  7. July, 91% of days have historically been favorable, wind has typically been 9 knots
  8. August, 91% of days have historically been favorable, wind has typically been 10 knots
  9. September, 93% of days have historically been favorable, wind has typically been 9 knots, historically most favorable
  10. October, 81% of days have historically been favorable, wind has typically been 11 knots
  11. November, 81% of days have historically been favorable, wind has typically been 11 knots
  12. December, 83% of days have historically been favorable, wind has typically been 11 knots

September has typically 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

Rough labels: “Commonly seen” usually means two or more recorded sightings near this site in public dive logs (GBIF), “Occasionally seen” one; “Seasonal” and “Rarely seen” come from dive-guide research. Not a measured rate.

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

No reviews yet — this site is waiting for its first. Dived here? Your rating and a few lines help the next diver.

Spot something off?

Help keep this listing accurate for the next diver.