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IntermediateShore entry

Brownstone Quarry (Brownstone Exploration & Discovery Park)

Connecticut, United StatesDirections
Open Water suggested0–26 m (0–85 ft) depthShore entry

Brownstone Quarry (Brownstone Exploration & Discovery Park) at a glance

Brownstone Quarry (Brownstone Exploration & Discovery Park) is an intermediate shore dive site in Connecticut, United States with depths of 0–25.9 m (0–85 ft). Typically most favorable Jun · from 3 years of archive data. Divers commonly see Largemouth bass, Brown trout, and Bluegill. Check the latest conditions and entry details before you go.

No window today· next: tomorrow 8:00–18:00 · favorable

Wind forecast for this hour · 19:00 · run 17 h ago
—

Tap a factor for its source and model point

Site hazards: Thermoclines and cold deep water, swimmers and other park users on the surface, depth drop-offs

Read the full hazards ↓

Dive windows this week

Lightest wind: Wed
SunNo window

3 kn wind (3 kn wind)

Mon8:00–18:00 favorable

4 kn wind (4 kn wind)

Tue8:00–10:00 moderate, 10:00–18:00 favorable

6 kn wind (6 kn wind)

Wed8:00–18:00 favorable

2 kn wind (2 kn wind)

Thu8:00–18:00 favorable

7 kn wind (7 kn wind)

Fri8:00–18:00 favorable

5 kn wind (5 kn wind)

Sat8:00–18:00 favorable

4 kn wind (4 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 6:46 · Sunrise 7:14 · Sunset 17:54 · some windows run past sunset

Source: Open-Meteo wind · updated 25 Oct, 01:21 GMT-4

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Brownstone Quarry (Brownstone Exploration & Discovery Park)

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: Largemouth bass, Bluegill, Yellow perch
Best time: Summer season during park hours

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, 75% of days have historically been favorable, wind has typically been 11 knots
  2. February, 82% of days have historically been favorable, wind has typically been 11 knots
  3. March, 72% of days have historically been favorable, wind has typically been 12 knots
  4. April, 81% of days have historically been favorable, wind has typically been 11 knots
  5. May, 82% of days have historically been favorable, wind has typically been 9 knots
  6. June, 97% of days have historically been favorable, wind has typically been 9 knots, historically most favorable
  7. July, 95% of days have historically been favorable, wind has typically been 8 knots
  8. August, 92% of days have historically been favorable, wind has typically been 8 knots
  9. September, 94% of days have historically been favorable, wind has typically been 8 knots
  10. October, 92% of days have historically been favorable, wind has typically been 9 knots
  11. November, 83% of days have historically been favorable, wind has typically been 11 knots
  12. December, 78% of days have historically been favorable, wind has typically been 10 knots

June 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 recorded at this site, by month

Recorded observations — evidence of past sightings, 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.

  • Micropterus dolomieu recorded here Jun (1 record)

    most recent 2008

Newest record here: 2008. Counts are occurrence records near this site from public biodiversity datasets (GBIF), grouped by calendar month across all sampled years. Sightings vary — past records are context, not a prediction.

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 June 2026

Site details

A flooded 27-acre historic brownstone quarry in Portland operated as an adventure park, with 80-100 foot cliffs surrounding clear fresh water. Scuba diving is permitted in the north quarry for certified divers who buy an adventure pass, with depths to about 85 feet and submerged quarry features and attractions to explore.

shorewall

Thermoclines and cold deep water, swimmers and other park users on the surface, depth drop-offs

Reviews

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