Rebuilding Brooklyn
News12 New York
Where to Watch
Download the App
Local
Crime
Weather
Taking Action
beWell
The East End
Crime Files

Greenwood Lake officials ban boating and kayaking amid possible harmful algae in lake's north arm

Jim Martin sent the New York State Department of Environmental Conservation a video of what appeared to be harmful algal blooms since they slid through the holes in his skimmer, unlike non-harmful algal blooms that have a more solid consistency.

Ben Nandy

Aug 1, 2025, 5:39 PM

Updated

Share:

More Stories

Greenwood Lake officials are taking zero chances with the discovery of what's believed to be harmful algae in the lake's north arm, temporarily banning boating and kayaking in that part of the lake.

Jim Martin sent the New York State Department of Environmental Conservation a video of what appeared to be harmful algal blooms since they slid through the holes in his skimmer, unlike non-harmful algal blooms that have a more solid consistency.

The video, taken by the dock behind Martin's home on July 25, led the DEC to confirm on its online NYHABs map that harmful algal blooms are in the lake's northern arm.

Martin, a member of the bi-state watchdog group the Greenwood Lake Commission, said the algae may have been fed by the recent heat and the many substances that slide down the mountains on both sides of the lake.

"All the runoff — including from the Jenning's Creek Fire last year — went into the lake, is causing more nutrients to grow more weeds and algae," Martin said.

Upon learning of the potential for harmful algae in the northern arm, Mayor Tom Howley closed the north arm's kayak launch "out of an abundance of caution," and then went to check on the beach at Thomas Morahan Waterfront Park, a gem for locals and a draw for tourists.

Howley, who has been checking the beach three times a day, said the beach area is algae-free, and there are no other reports of harmful algae outside the lake's north arm.

He said a contractor will survey the edges of the lake next week for the blooms.

The north arm is more prone than the rest of the lake to becoming stagnant, a good environment for algae.

The mayor is asking village residents to photograph and report anything they think might be harmful algal blooms.

"We do expect algae growth up there," he said Friday at Village Hall. "It's just a matter of watching it closely, and keeping the public informed."

Howley has also been seeking grants to help the village fund long-term projects to eradicate algae and invasive weeds that have been growing rapidly in the north arm.

He said the village is still the destination it has always been.

He is trying to keep it that way.

"We love our visitors. We love our residents enjoying what we can offer," he said. "Rest assured, we're going to be monitoring that beach ... and if anything should change, we'll make the proper notifications to everybody."

The Greenwood Lake Commission members and other environmentalists are waiting to see if, and how much, algae appears once the area experiences another stretch of intense heat.

More Stories

Top Stories

01:57
530AVIOLENTROBBERYPATTst_2026-05-14-05-45-36

New images released of 3 men on the run after violent robberies across Borough Park

01:52
LEANNEBK2

Rainy start in Brooklyn before a big warmup

01:06
514snatchingspree1_2026-05-14-05-48-23

Three men wanted in connection to robbery spree in The Bronx, Brooklyn

00:33
530A60TH ST VIOLENT ROBBERY ST_2026-05-14-05-44-34

NYPD searches for 2 people after man robbed of nearly $3K worth of property in Borough Park

00:50
514BRIDGEDEBRISUPDATE_subclip_2026-05-14-05-25-16

George Washington Bridge lower level reopens after debris falls on Cross-Bronx Expressway

01:57
roadtripbrooklynpopCM_2026-05-13-22-58-27

Brooklyn Pop: Immersive exhibit turns Brooklyn history into interactive experience

01:58
514rebuildiungbrooklyn_2026-05-14-05-54-41

Dumbo street restoration project wins preservation award

01:03
514eastend_2026-05-14-06-12-35

The East End: South Fork Sea Farmers

00:38
chabadcrashguiltyplea1030pZC_2026-05-13-22-50-47

Man admits to intentionally ramming his car into Chabad Lubavitch Headquarters in Crown Heights

01:42
lirrstrikelatestCM_2026-05-13-22-44-52

LIRR strike still looms after no agreement reached

01:22
busfineenforcementcomingCM_2026-05-13-22-44-34

B12 bus route added to city's ACE fine program

01:27
flatbushavebuslanesCM_2026-05-13-22-48-07

Riders want to keep wheels turning on Flatbush Avenue center-running bus lanes project

01:47
homelessencampmentCM_2026-05-13-18-39-50

‘Pure hell.’ Bay Ridge residents fed up with repeated homeless encampment fires

01:34
sunsetparkslowdownCM_2026-05-13-18-38-54

Survey shows Sunset Park businesses feel impact of immigration enforcement fears

01:47
BKSNOWSHOVELERSNOTPAID05135P_2026-05-13-17-49-29

DSNY says it's still working to pay its emergency snow shovelers

01:28
BXCHESTNUTTENANTSUNION05135P_2026-05-13-17-57-56

East New York residents travel to the Bronx to confront apartment building management

01:44
513edricnoon_2026-05-13-12-33-44

Fire rips through part of Cypress Hills building; lithium-ion batteries found on scene 

01:35
513libraryclosure_2026-05-13-06-48-07

Bushwick library closure sparks concern across community

01:47
513mamdanibudgetpkg_2026-05-13-06-35-44

Mayor Mamdani unveils $124.7B NYC budget proposal focused on housing, childcare and education

02:18
ramadainnsheltermeetingCM_2026-05-12-22-48-37

Tensions grow over men's shelter coming to Crown Heights

App StoreGoogle Play Store

info

Newsletter

Send Photos/Videos

Contact

About Us

News Team

News 12 New York

follow us

Twitter

Facebook

Instagram

more resources

Optimum Corporate

Optimum Service

Advertise on News 12

Careers

Content Removal Policy

© 2026 N12N, LLC

Privacy Policy

Terms of Service

Ad Choices