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Q&AWater quality · Massachusetts

Algae on Quabbin Reservoir: 6 questions answered

The questions we hear most about Quabbin Reservoir right now, answered with this week's numbers.

Rabbit Run Rail Bed entering the Quabbin Reservoir, Petersham MA
Rabbit Run Rail Bed entering the Quabbin Reservoir, Petersham MA. Photo: John Phelan, CC BY-SA 4.0
Algaelikelylatest clear view, last week
Water56°Fsurface, a few days ago
Top gust18 mphThursday

The latest clear view of Quabbin Reservoir, last week, shows the color of an algae bloom on the water. Here is what that means for a trip, question by question.

How cold is Quabbin Reservoir right now?

About 56°F at the surface on the latest clear reading (a few days ago). Shallow coves can run a few degrees off that on sunny afternoons.

45505560°FOct 29Nov 1Nov 4Nov 756°F
Surface water temperature on Quabbin Reservoir, °F. Each dot is a clear-day reading; cloudy days leave gaps.

Is it safe to swim in Quabbin Reservoir?

We can't call any lake safe. The latest clear view showed signs of a bloom. Stay out of water that looks green, scummy or like spilled paint, keep dogs out of it, and check your state's lake advisory page before a swim day.

What does a bloom look like?

Pea-soup green water, a film or scum on the surface, or streaks like spilled paint, often piled up along the downwind shore. Clear water nearby can look very different, because blooms drift with the wind.

Depth map of Quabbin Reservoir: shoreline, depth shading and contour lines, with today's free fishing spot DamDeepest water 2 miles
Shallow to deep Free spot todayPlace to stay
Quabbin Reservoir lake bed. Darker blue is deeper water. The star marks the free spot named in this report (point drop-off). Shading shows the shape of the bed, shallow to deep, not exact depths.

What's biting on Quabbin Reservoir?

On Quabbin Reservoir, lake trout are a fair bet. Cool surface water brings lake trout up toward shore points. Smallmouth bass here are catchable with patience. Smallmouth handle cool water well; the 50s often bring some of the biggest fish of the year onto rocky points.

When is the best time to fish Quabbin Reservoir this week?

Thursday rates good for the bite, best 2:45 pm to 3:30 pm. Dawn and dusk are the most reliable hours any day.

WedNov 11 54° 38°8–9mph WFair
ThuNov 12 50° 35°13–18mph EGood
FriNov 13 42° 31°17mph NFair
SatNov 14 LaterFair
SunNov 15 LaterGood
MonNov 16 LaterGood
TueNov 17 LaterGood
The days ahead on Quabbin Reservoir. Sky, high and low (°F), wind and gusts (mph, with the direction it blows from), and the bite rating from sunrise, sunset, the moon and the wind.

How deep is Quabbin Reservoir?

Around 150 ft at its deepest; it covers about 24,700 acres with roughly 181 miles of shoreline at full pool.

Water quality

Numbers in this report are estimates to help you plan a day on the water, not official safety information. Conditions change: check Quabbin Reservoir today before you go.

Quabbin Reservoir every morning

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