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Map of McAllister Grounds
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IntermediateBoat entry

McAllister Grounds

New York, United States
Open Water suggested15–16 m (48–53 ft) depthBoat entry7mm or semi-dry + hood typical

Boat dive — see Entry & access.

McAllister Grounds at a glance

McAllister Grounds is an intermediate boat dive site in New York, United States with depths of 14.6–16.2 m (48–53 ft). Typically most favorable Jul · from 3 years of archive data. Divers commonly see Summer flounder (fluke), American lobster, and Scup (porgy). Recent reports put the water around 16°C (61°F). Check the latest conditions and entry details before you go.

Favorable window now· until 18:00 · sunset 17:58

Forecast for this hour · 16:00 · run 15 h ago
0.6 m (2.0 ft)waves — under a meter expected (waves — about two feet expected)

Tap a factor for its source and model point · Forecast 16°C · seasonal avg 18°C ( · Forecast 61°F · seasonal avg 65°F)

Site hazards: Open Atlantic current and swell; heavy fishing pressure with monofilament/tackle; boat traffic; limited visibility.

Read the full hazards ↓

Dive windows this week

Mon8:00–18:00 favorable

0.6 m waves · 11 kn wind (2.1 ft waves · 11 kn wind)

Tue8:00–18:00 favorable

0.7 m waves · 10 kn wind (2.4 ft waves · 10 kn wind)

Wed8:00–18:00 favorable

0.6 m waves · 3 kn wind (2.0 ft waves · 3 kn wind)

Thu8:00–18:00 favorable

0.5 m waves · 10 kn wind (1.6 ft waves · 10 kn wind)

Fri8:00–18:00 favorable

0.5 m waves · 11 kn wind (1.6 ft waves · 11 kn wind)

Sat8:00–18:00 favorable

0.5 m waves · 8 kn wind (1.5 ft waves · 8 kn wind)

Sun8:00–18:00 favorable

0.7 m waves · 9 kn wind (2.3 ft waves · 9 kn wind)

Favorable windowModerate window— no window

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

First light 6:50 · Sunrise 7:18 · Sunset 17:58 · some windows run past sunset

Source: Open-Meteo marine · model point 4.3 km from site · updated 26 Oct, 01:20 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near McAllister Grounds

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

Known for: Scup (porgy), Tautog (blackfish), Black sea bass
Best time: July-October on calm slack-water days.

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, 42% of days have historically been favorable, water has typically been 6°C (43°F), waves have typically been 1.4 m (4.6 ft), wind has typically been 21 knots
  2. February, 49% of days have historically been favorable, water has typically been 5°C (41°F), waves have typically been 1.4 m (4.5 ft), wind has typically been 20 knots
  3. March, 38% of days have historically been favorable, water has typically been 6°C (43°F), waves have typically been 1.5 m (5.0 ft), wind has typically been 21 knots
  4. April, 47% of days have historically been favorable, water has typically been 9°C (48°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 20 knots
  5. May, 70% of days have historically been favorable, water has typically been 13°C (56°F), waves have typically been 1.1 m (3.7 ft), wind has typically been 17 knots
  6. June, 74% of days have historically been favorable, water has typically been 18°C (64°F), waves have typically been 1.0 m (3.4 ft), wind has typically been 17 knots
  7. July, 82% of days have historically been favorable, water has typically been 22°C (72°F), waves have typically been 1.0 m (3.2 ft), wind has typically been 15 knots, historically most favorable
  8. August, 72% of days have historically been favorable, water has typically been 22°C (72°F), waves have typically been 1.1 m (3.7 ft), wind has typically been 16 knots
  9. September, 59% of days have historically been favorable, water has typically been 22°C (71°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 17 knots
  10. October, 54% of days have historically been favorable, water has typically been 18°C (65°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 18 knots
  11. November, 51% of days have historically been favorable, water has typically been 13°C (56°F), waves have typically been 1.2 m (4.0 ft), wind has typically been 21 knots
  12. December, 41% of days have historically been favorable, water has typically been 9°C (47°F), waves have typically been 1.4 m (4.7 ft), wind has typically been 21 knots

July 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

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

McAllister Grounds (Fishing Line) Reef is a 425-acre NYSDEC artificial reef in the Atlantic Ocean about 2.8 nautical miles south of Long Beach, in 48-53 ft of water. Despite its 'fishing line' name it is a developed reef built from vessels, barges, scow pieces, steel miter/dam gates, a turbine, rock and concrete forms, with concrete blocks/forms added in 2025. It supports black sea bass, tautog and scup; visibility is typically 10-20 ft—an intermediate Atlantic boat dive.

boatreefwreck

Open Atlantic current and swell; heavy fishing pressure with monofilament/tackle; boat traffic; limited visibility.

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