IntermediateShore entry

Brownstone Quarry (Brownstone Exploration & Discovery Park)

Connecticut, United StatesDirections

Open Water suggested0–26 m 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.

Wind model · graded 13h ago

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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

Best: Sat

Fri7:00–20:00

Sat7:00–20:00

Sun7:00–20:00

Mon10:00–20:00

Tue7:00–19:00

Wed7:00–19:00

Thu7:00–16:00

Favorable windowModerate window— no window

First light 5:59 · Sunrise 6:27 · Sunset 19:07

Source: Open-Meteo wind · graded 13h ago

Forecast only — always assess conditions on site.

Forecast · NOAA tide model

Tide & slack timing

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.

Jan75% 11 kn
Feb82% 11 kn
Mar72% 12 kn
Apr81% 11 kn
May82% 9 kn
Jun97% 9 kn
Jul95% 8 kn
Aug92% 8 kn
Sep94% 8 kn
Oct92% 9 kn
Nov83% 11 kn
Dec78% 10 kn

June 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 recorded at this site, by month

Recorded observations — evidence of past sightings, not a promise of what you’ll encounter.

Species seen here

Micropterus dolomieu recorded here Jun (1 record)
most recent 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.

New England Dive22.1 km
Report a fix

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

How deep is Brownstone Quarry (Brownstone Exploration & Discovery Park)?

Brownstone Quarry (Brownstone Exploration & Discovery Park) ranges from 0 to 25.9 metres deep (0–85 feet). It is a freshwater site rated as intermediate difficulty. Depths vary across the site, so plan your profile to your training and verify conditions locally.

Is Brownstone Quarry (Brownstone Exploration & Discovery Park) a shore dive or a boat dive?

Brownstone Quarry (Brownstone Exploration & Discovery Park) is a shore dive — you can enter from land. The entry is recorded as an easy walk-in. The entry area is recorded as sheltered from surge. Basic facilities are recorded at or near the site, and cell service is recorded as good. Entry details and parking notes, where known, are listed in the access section of this page.

Can beginners dive Brownstone Quarry (Brownstone Exploration & Discovery Park)?

Brownstone Quarry (Brownstone Exploration & Discovery Park) is rated as intermediate difficulty, which may not suit new divers. Listed depths run from 0 to 25.9 metres (0–85 feet). Access is from shore, with the entry recorded as an easy walk-in. Consider your experience level, conditions, and local guidance before planning.

When is the best time to dive Brownstone Quarry (Brownstone Exploration & Discovery Park)?

The best time to dive Brownstone Quarry (Brownstone Exploration & Discovery Park) is typically Summer season during park hours. Seasonal closures are recorded: Park operates seasonally (summer season). Conditions vary, so check the latest reports and forecasts on the dive site page before your trip.

What will I see at Brownstone Quarry (Brownstone Exploration & Discovery Park)?

Divers at Brownstone Quarry (Brownstone Exploration & Discovery Park) in United States commonly report sightings of Largemouth bass, Brown trout, Bluegill, Crayfish, and Yellow perch. Largemouth bass, Bluegill, and Yellow perch are recorded as common sightings, while Brown trout and Crayfish are reported only occasionally. Marine life varies by season and conditions—check the site page for recent diver observations and photos.

Reviews

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