Calendar

Gallery Reception: Fragile Waterways–Protecting What We Love

12/08/2019 - 3:00pm to 5:00pm

Gallery Reception: Fragile Waterways–Protecting What We Love

12/08/2019 - 3:00pm to 5:00pm

An Illustrated Talk by Tom Tarnowsky

01/26/2020 - 3:00pm

Thank Nature Day

12/01/2019 - 2:00pm to 4:00pm

Lenoir Nature Preserve to Keepers House Loop

12/04/2019 - 12:00pm

Hastings Way Back When, Then and Now

11/10/2019 - 2:00pm to 10/12/2020 - 4:00pm

Croton Reservoir & Dam First Day Hike

01/01/2020 - 12:00pm

Weirs to Beers: Ossining & the Aqueduct

12/28/2019 - 12:30pm

High Bridge Tour

12/21/2019 - 10:00am

Croton Reservoir & Dam to Ossining Weir (one way or loop) tour

12/14/2019 - 11:00am

Croton Reservoir & Dam Hike

12/08/2019 - 11:00am

Rockwood Hall – Archville Bridge – Rockefeller Preserve

11/16/2019 - 10:00am

Weirs to Beers: Ossining & the Aqueduct

11/30/2019 - 12:30pm

Croton Reservoir & Dam Hike

11/24/2019 - 11:00am

Weir Tour

11/23/2019 - 11:00am

Meandering among the Mansions of the Historic Millionaires

11/17/2019 - 2:00pm

Croton Reservoir & Dam Hike

11/10/2019 - 11:00am

Weir Tour

11/09/2019 - 1:00pm

A Call to Action: Protecting Nature's Biodiversity

11/15/2019 - 10:00am to 3:30pm

Exhibition: HOW NEW YORK BECAME THE EMPIRE CITY

10/20/2019 - 2:00pm to 10/20/2020 - 4:00pm

Walk the High Bridge & Explore Nearby

10/05/2019 - 10:00am

CANCELLED - Croton Reservoir & Dam Hike

10/27/2019 - 11:00am

Weir Tour

10/26/2019 - 11:00am

Lenoir Nature Preserve to Untermyer Gardens

10/16/2019 - 10:00am

Croton Reservoir & Dam Hike

10/14/2019 - 10:00am

Weir Tour

10/12/2019 - 11:00am

Croton Reservoir & Dam Hike

09/29/2019 - 2:00pm

Weir Tour

09/28/2019 - 10:00am

Invasive Species Volunteer Day

09/28/2019 - 9:30am to 3:00pm

High Bridge & Aqueduct South Walking Tour

09/21/2019 - 10:30am

Croton Reservoir & Dam Hike

09/15/2019 - 10:00am

Weir Tour

09/14/2019 - 10:00am

Croton Reservoir & Dam Hike (TIME CORRECTED)

08/18/2019 - 2:00pm

Croton Reservoir & Dam Hike

08/31/2019 - 2:00pm

Weir Tour

08/31/2019 - 10:00am

High Bridge Tour

08/25/2019 - 12:00pm

Weir Tour

08/24/2019 - 10:00am

Croton Reservoir & Dam Hike

07/18/2019 - 2:00pm

Weir Tour

08/18/2019 - 10:00am

Weir Tour

08/17/2019 - 10:00am

Walk the High Bridge and Explore Nearby

07/27/2019 - 10:00am

Tibbetts Brook Park Loop

07/28/2019 - 2:00pm

Croton Reservoir & Dam Hike

07/28/2019 - 10:00am

Weir Tour

07/27/2019 - 10:00am

Tibbetts Brook Park Loop (POSTPONED)

07/21/2019 - 2:00pm

Walk the High Bridge & Explore Nearby - (POSTPONED)

07/20/2019 - 10:00am

Croton Reservoir & Dam Hike

07/14/2019 - 10:00am

Weir Tour

07/13/2019 - 10:00am

"Making History in Dobbs Ferry: The Aqueduct Inspires a Downtown Historic District"

06/23/2019 - 2:00pm to 4:00pm

The Many Lives of John Bloomfield Jervis, an illustrated talk by Bob Boothe, Industrial Heritage Historian

06/02/2019 - 4:00pm

New York City's Water System

05/02/2019 - 7:00pm

Walk on Water: Croton Aqueduct up Amsterdam Avenue to the High Bridge

05/05/2019 - 11:00am

Walk on Water: Croton Aqueduct up Amsterdam Avenue to the High Bridge

05/04/2019 - 9:00am

Croton Reservoir & Dam Hike

06/29/2019 - 2:00pm

Weir Tour

06/29/2019 - 10:00am

Bronx Aqueduct Walk's First Group Meeting

04/18/2019 - 6:00pm to 8:30pm

Meandering among the Mansions of the Historic Millionaires

06/30/2019 - 12:00pm

Old Croton Aqueduct Keeper’s House Open House & Curator’s Talk

06/16/2019 - 1:00pm to 4:00pm

Weirs to Beers: The Aqueduct in Ossining

06/15/2019 - 10:30am

Lenoir Nature Preserve to Keepers House Loop

06/12/2019 - 10:00am

Weir Tours (continuous) as part of the Ossining Village Fair

06/08/2019 - 10:00am to 4:00pm

Croton Reservoir & Dam Hike

05/26/2019 - 10:00am

Weir Tour

05/25/2019 - 10:00am

Eighth Annual I Love My Park Day

05/04/2019 - 9:30am to 3:00pm

Walk the High Bridge & Explore Nearby

05/18/2019 - 10:00am

Yonkers Clean-up Day

04/27/2019 - 9:00am to 2:00pm

Lenoir Nature Preserve to Untermyer Gardens

04/10/2019 - 10:00am

Marcia Brewster: Water, Sanitation and Gender: Issues for the 21st Century

03/13/2019 - 6:00pm

Van Cortlandt Park trails, including the Old Croton Aqueduct

04/28/2019 - 11:00am

Croton Reservoir & Dam Hike

04/27/2019 - 10:00am

Weirs to Beers: The Aqueduct in Ossining

04/20/2019 - 10:30am

Weir Tour

04/06/2019 - 11:00am

Croton Reservoir & Dam Hike

03/23/2019 - 10:00am

CANCELLED - Free-A-Tree Invasive Vine Removal

03/02/2019 - 10:00am to 1:00pm

An Evening with Mary Calvi

02/15/2019 - 6:00pm to 9:00pm

Guided House Tour - Armour-Stiner (Octagon) House

02/24/2019 - 10:00am

CANCELLED - Croton Reservoir & Dam Hike

03/02/2019 - 10:00am

Weirs to Beers: Ossining & The Aqueduct

03/16/2019 - 10:30am

Walk the High Bridge & Explore Nearby

02/09/2019 - 10:00am

Croton Reservoir & Dam Hike

02/02/2019 - 10:00am

Opening Reception for "The Tunnel: A Passage Through History"

12/16/2018 - 5:30pm to 7:30pm

Along the Aqueduct Trail - Meet the new Curator of the Lenoir Nature Preserve, Sara Cavanaugh

01/05/2019 - 1:30pm

CANCELLED - Free-A-Tree Invasive Vine Removal

01/05/2019 - 10:00am to 1:00pm

Free-A-Tree Invasive Vine Removal

02/02/2019 - 10:00am to 1:00pm

Free-A-Tree Invasive Vine Removal

12/01/2018 - 10:00am to 1:00pm

Tours of the Armour-Stiner Octagon House

11/18/2018 - 11:00am to 3:00pm

Tours of the Armour-Stiner Octagon House

11/17/2018 - 11:00am to 3:00pm

Croton Reservoir & Dam First Day Hike

01/01/2019 - 12:00pm

New York City's Water System: A Talk by Adam Bosch

11/09/2018 - 7:00pm

Weir Tour

11/10/2018 - 10:00am

Reservoir Cleanup Day

09/30/2018 - 12:00pm to 3:00pm

Distributing Reservoir Stones at New York Public Library

12/08/2018 - 10:00am

Croton Reservoir & Dam Hike

12/01/2018 - 10:00am

Croton Reservoir & Dam Hike

11/03/2018 - 10:00am

Brick by Brick: The Erie Canal & the Building Boom

10/02/2018 - 12:00pm to 01/19/2019 - 5:00pm

Walk the High Bridge & Explore Nearby

10/27/2018 - 9:30am

Weir Tour

10/13/2018 - 10:00am

Rockwood Hall – Archville Bridge – Rockefeller Preserve

10/08/2018 - 1:00pm

Unravelling the 5 Corners Knot: Guided Old Croton Aqueduct Trail Walk

10/07/2018 - 1:30pm

Old Croton Aqueduct Keeper’s House - Open House

10/07/2018 - 1:00pm to 4:00pm

Meandering among the Mansions of the Historic Millionaires

09/23/2018 - 12:00pm

Croton Reservoir and Dam Hike

09/22/2018 - 10:00am

Weir Tour

09/08/2018 - 10:00am

Croton Reservoir and Dam Hike (rain or shine)

08/26/2018 - 10:00am

Walk the High Bridge and Explore Nearby

08/18/2018 - 9:40am

Weir Tour

08/05/2018 - 10:00am

Walk the High Bridge and Explore Nearby

07/21/2018 - 9:40am

High Bridge Walking Tour by NYC H20

06/24/2018 - 12:00pm

Invasive Species Workshop

07/15/2018 - 10:00am to 12:00pm

Weir Tour

07/14/2018 - 10:00am

Croton Reservoir & Dam Hike (rain or shine)

07/08/2018 - 10:00am

Weir Tour (WEEKDAY)

05/25/2018 - 4:00pm

Highbridge Trails Stewardship

05/26/2018 - 11:00am to 2:00pm

"The Old Croton Aqueduct" - a talk by Cornelia Cotton

06/03/2018 - 4:30pm

Highbridge Rocks Community Festival

05/12/2018 - 11:00am to 3:00pm

Walking Tour of the High Bridge

05/20/2018 - 12:00pm

Weir Tour

06/17/2018 - 10:00am

Old Croton Aqueduct Keeper’s House Open House & Curator’s Talk

06/16/2018 - 11:00am to 4:00pm

Weir Tours (continuous) as part of the Ossining Village Fair

06/09/2018 - 10:00am to 4:00pm

Van Cortlandt Park Loop

05/27/2018 - 11:00am

Croton Reservoir & Dam Hike

05/20/2018 - 9:00am

Weir Tour

05/19/2018 - 12:15pm

Walk the High Bridge & Explore Nearby

05/12/2018 - 10:30am

Seventh Annual I Love My Park Day - INVASIVES CLEANUP

05/05/2018 - 9:30am to 3:00pm

Yonkers OCA Cleanup

04/21/2018 - 9:00am to 2:00pm

Weir Tour

04/21/2018 - 10:00am

Croton Reservoir & Dam Hike

04/15/2018 - 11:00am

Untermyer Park – Joint walk with WTA

04/14/2018 - 10:00am

Old Croton Aqueduct Volunteer Day – Rid the Trail of Invasive Plants with the Friends of the Old Croton Aqueduct and the NY-NJ Trail Conference

04/07/2018 - 9:00am to 2:00pm

Croton Reservoir & Dam Hike

03/24/2018 - 10:00am

Walk the High Bridge & Explore Nearby

03/11/2018 - 10:30am

Weir Tour

03/10/2018 - 10:00am

Free-A-Tree on the OCA

03/03/2018 - 10:00am to 1:00pm

Riverwalk-Irvington Loop walk. Ramble along the Riverwalk and Aqueduct Trails past the Estates of Gilded Age Millionaires

02/10/2018 - 11:00am

Free a Tree on the OCA

02/03/2018 - 10:00am to 1:00pm

ANNUAL MEETING: Tales of Croton Point: A Colorful History

04/07/2019 - 2:00pm

FOCA Annual Meeting 2018 - "Operating and Maintaining the Greatest Waterworks in America"

04/29/2018 - 2:00pm

Trivia Contest at the Watershed Relief Map

01/28/2018 - 2:00pm

Croton Reservoir & Dam Hike

01/01/2018 - 12:00pm

KEEPER'S HOUSE EXHIBITION: The Tunnel: A Passage Through History

12/16/2018 - 1:00pm to 06/16/2019 - 4:00pm

Holiday Gathering

12/09/2017 - 1:30pm to 4:00pm

Weir Tour

12/02/2017 - 10:00am

Van Cortlandt Park to High Bridge Walk

11/19/2017 - 11:00am

To Quench The Thirst of New Yorkers

09/02/2017 - 10:00am to 12/31/2017 - 5:00pm

Yonkers Pop-Up Cleanup

10/02/2017 - 10:30am to 2:30pm

Old Croton Bike Tour - NYC H20

10/28/2017 - 12:00pm

Tibbetts Brook Exploration - NYC H20

10/01/2017 - 4:00pm

Old NYC Water Supply Walk - NYC H20

09/27/2017 - 6:30pm

Distributing Reservoir Stones at New York Public Library

11/18/2017 - 10:00am

Van Cortlandt Park Loop – Old Croton Aqueduct & Putnam Rail Trails

10/22/2017 - 11:00am

Weir Tour

10/21/2017 - 12:30pm

Liquid Geographies @ The New School

09/26/2017 - 6:00pm to 8:00pm

175th Anniversary Celebration!

10/08/2017 - 2:00pm to 6:00pm

Ossining Annual 5K Run, 2 Mile Walk

09/09/2017 - 9:00am

Retracing the Capture of Revolutionary War British Spy Major Andre

11/04/2017 - 10:00am

Ramble along the Riverwalk and Aqueduct Trails past the Estates of Gilded Age Millionaires

10/29/2017 - 10:00am

Weir Tour

10/07/2017 - 10:00am

“Woman on a Wheel” - centennial of Women’s Suffrage in New York State

09/23/2017 - 10:00am

Weekday Weir Tour

09/08/2017 - 2:00pm

High Bridge Walking Tour

09/17/2017 - 12:00pm

175th Anniversary Reception, Hilltop Hanover

10/08/2017 - 3:00pm

175th Anniversary Presentation - Hilltop Hanover

09/30/2017 - 12:00pm

"The Art of the Aqueduct" @ Hilltop Hanover

09/23/2017 - 12:00pm

175th Anniversary Presentation - Hilltop Hanover

09/16/2017 - 12:00pm

175th Anniversary presentation - Hilltop Hanover

09/09/2017 - 12:00pm

Cornelia Cotton lecture on OCA prints

08/11/2017 - 5:00pm to 6:00pm

Weir Tour -- A Hudson River Valley Ramble Event

09/23/2017 - 10:00am

Meandering among the Mansions of the Historic Millionaires. A Hudson River Valley Ramble Event.

09/16/2017 - 10:00am

Croton Reservoir & Dam Hike

09/09/2017 - 10:00am

Weir Tour

08/26/2017 - 10:00am

Hastings Rowley’s Bridge Trail — Aqueduct Trail Walk

08/20/2017 - 10:00am

Croton Reservoir & Dam Hike

08/05/2017 - 10:00am

Croton Reservoir & Dam Hike

07/22/2017 - 10:00am

High Bridge Tour

07/15/2017 - 10:30am

Weir Tour

07/08/2017 - 10:00am

Invasive Plant Strike Force Volunteer Day

07/08/2017 - 9:00am to 2:00pm

Old NYC Water Supply Walk

06/15/2017 - 6:30pm to 8:30pm

Old Croton Aqueduct Keepers House & Quarry Walk

06/24/2017 - 11:00am

Designers for the Millionaires of the Gilded Age

06/18/2017 - 2:00pm to 3:30pm

Designers for the Millionaires of the Gilded Age

06/18/2017 - 11:00am to 12:30pm

Old Croton Aqueduct Keepers House – PATH THROUGH HISTORY

06/17/2017 - 10:00am to 4:00pm

Weir Tours (continuous) as part of the Ossining Village Fair

06/10/2017 - 10:00am to 4:00pm

Croton Reservoir & Dam Hike

06/04/2017 - 10:00am

High Bridge Tour

06/03/2017 - 10:30am

Weir Tour (weekday)

06/02/2017 - 10:00am

Meandering among the Historic Millionaires’ Mansions Walk

05/20/2017 - 10:00am

Weir Tour

05/06/2017 - 10:00am

Croton Reservoir & Dam Hike

04/29/2017 - 10:00am

Keeper's House Drop-In Hours

05/28/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/02/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/01/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/27/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/21/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/20/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/14/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/13/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/07/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

05/06/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/29/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/30/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/23/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/22/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/16/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/15/2017 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

04/09/2017 - 10:00am to 4:00pm

Keeper's House Drop-In Hours

04/08/2017 - 10:00am to 4:00pm

Untermyer Park -- Joint walk with WTA

04/29/2017 - 10:00am

Old Croton Aqueduct at Ossining -- Weir Tour

04/15/2017 - 10:00am

Croton Reservoir and Dam Hike

03/18/2017 - 10:00am

History of the High Bridge and the Croton Waterworks

03/26/2017 - 3:30pm to 5:00pm

Sixth Annual I Love My Parks Day

05/06/2017 - 9:30am to 3:30pm

Old Croton Aqueduct Distributing Reservoir Stones at New York Public Library Tour

03/25/2017 - 10:00am to 12:00pm

Annual Yonkers Trail Cleanup 2017

04/22/2017 - 9:00am to 2:00pm

Old Croton Aqueduct at Ossining - Weir Tour

02/18/2017 - 2:00pm

Annual Meeting: "Turning Water Into Money: Aaron Burr's Manhattan Company"

04/23/2017 - 2:00pm to 4:00pm

Keeper's House CLOSED

12/24/2016 - 10:00am to 12/25/2016 - 4:00pm

A Historical Perspective on Water in NYC, with special focus on Jamaica Bay - lecture by Eric Sanderson

12/09/2016 - 7:00pm to 8:30pm

Sing Sing Kill Greenway and the Old Croton Aqueduct at Ossining

01/21/2017 - 10:00am

Croton Reservoir & Dam Hike

01/01/2017 - 12:00pm

Old Croton Aqueduct at Ossining - Weir Tour

11/12/2016 - 10:00am

Walk Around Jerome Park Reservoir

11/20/2016 - 12:00pm

Walk Around Jerome Park Reservoir

11/19/2016 - 12:00pm

Croton Reservoir and Dam Hike

10/29/2016 - 11:00am

Old Croton Aqueduct at Ossining – Weir Tour

10/23/2016 - 2:00pm

The Irvington Historical Society Fall Benefit Event

09/10/2016 - 1:00pm to 5:00pm

Dobbs Ferry Festa

10/15/2016 - 12:00pm to 4:00pm

High Bridge Tour

10/16/2016 - 10:30am

Old Croton Aqueduct and Dam Ramble

10/02/2016 - 9:00am

Retracing the Capture of Revolutionary War Spy Major Andre

10/01/2016 - 10:00am

Meandering among the Historic Millionaires’ Mansions Walk

09/25/2016 - 2:00pm

Old Croton Aqueduct at Ossining – Weir Tour

09/17/2016 - 10:00am

Croton Reservoir and Dam Hike

09/10/2016 - 10:00am

Walk the High Bridge and Explore Nearby

09/03/2016 - 9:30am

Old Croton Aqueduct at Ossining – Weir Tour

08/28/2016 - 2:00pm

Old Croton Aqueduct in Yonkers to Untermyer Gardens Walk

08/27/2016 - 10:00am

Old Croton Aqueduct and Dam Ramble

07/31/2016 - 9:00am

Old Croton Aqueduct at Ossining – Weir Tour

07/16/2016 - 10:00am

Walk the High Bridge and Explore Nearby

07/12/2016 - 9:00am

NYC H2O: Old NYC Water Supply Walk

07/14/2016 - 6:30pm

Open House at the Keeper's House

06/26/2016 - 2:00pm to 5:00pm

Keeper's House Drop-in Hours

06/19/2016 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

06/18/2016 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

06/12/2016 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

06/11/2016 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

06/05/2016 - 10:00am to 4:00pm

Keeper's House Drop-in Hours

06/04/2016 - 10:00am to 4:00pm

NYC H20 High Bridge Walking Tour

08/07/2016 - 1:00pm

Riverkeeper talk: Meteorologist Storm Field & Riverkeeper Boat Captain John Lipscomb

05/02/2016 - 7:00pm

NYC H20 event: Ridgewood Reservoir Community Tour

04/23/2016 - 10:00am

OCA/Putnam Saleté Printemps Randonnée

04/23/2016 - 8:30am

Invasive Strike Force Volunteer Day

06/18/2016 - 10:00am to 3:00pm

Lower Hudson Watershed Collaboration and Partnership Event

04/21/2016 - 6:00pm

Volunteer Docent Meeting

04/17/2016 - 1:30pm

Lecture: Preserving New York with Anthony C Wood

04/17/2016 - 2:30pm

Volunteer Docent Meeting

04/12/2016 - 10:00am

Ossining Water Treatment Plant Tour

07/09/2016 - 10:00am

Meandering among the Historic Millionaires’ Mansions Walk

06/19/2016 - 2:00pm

Designers for the Millionaires of the Gilded Age

06/19/2016 - 10:30am

Mercy College to Aqueduct Keepers House and Mead House

06/18/2016 - 10:00am

Ossining Village Fair - Weir Tours

06/11/2016 - 9:00am to 4:00pm

Walk the High Bridge & Explore Nearby

06/07/2016 - 9:00am

Croton Reservoir & Dam Hike

06/04/2016 - 10:00am

Old Croton Aqueduct at Ossining Weir Tour

05/07/2016 - 10:00am

Old Croton Aqueduct walk, Hastings to Yonkers

04/30/2016 - 10:00am

FREE Film Screening: "FLOW"

04/14/2016 - 6:30pm

Hudson River Brick Makers

04/21/2016 - 7:30pm

Volunteer Docent Meeting

03/31/2016 - 7:30pm

Old Croton Aqueduct at Ossining Weir Tours

04/16/2016 - 2:00pm to 5:00pm

Croton Reservoir & Dam Hike

04/02/2016 - 11:00am

Old Croton Aqueduct at Ossining -- Weir Tour

03/26/2016 - 10:00am

Annual Yonkers Trail Clean-up

04/16/2016 - 9:00am to 2:00pm

Save the date: Walk under the Double Arch Bridge

04/16/2016 - 2:00pm

NYC H20 event: Tour of Yonkers Sewage Plant

03/02/2016 - 10:00am

I Love My Parks Day 2016

05/07/2016 - 9:30am

FOCA Annual Meeting - Catskill Aqueduct

05/01/2016 - 2:00pm

NYC H2O event: Watershed Relief Map

02/07/2016 - 1:00pm

NYC H2O event: Daylighting Tibbetts Brook

02/19/2016 - 7:00pm

Walking on Water: The Past and Future of the Old Croton Aqueduct

02/28/2016 - 1:00pm