Mill River, Hempstead NY

Having previously visited West Hempstead and its Pine Stream, I followed up with its parent municipality of Hempstead, which has Mill River running beneath its town center flowing towards Hempstead Lake State Park and into Hewlett Bay. In part on account of the destruction caused by Hurricane Sandy in October 2012, Mill River is the centerpiece of the state’s Living with the Bay plan which seeks to restore sections of this stream and make its watershed more resilient in reducing storm damage.


Above is a view of this stream emerging to the surface from a culvert at Tyler Avenue and Peninsula Boulevard. Although it hardly looks like a river, this creek played a vital role in the development of Hempstead and in its future in managing storm runoff.

Where it flows


On this 1897 topographical map, Mill River originated on the east side of Hempstead’s town center, widening into Hempstead Reservoir upon leaving town. It then picks up additional water from Schodack Brook and Pine Stream, flowing through two more ponds before widening into Hewlett Bay. For reference, I colored the Queens-Nassau border in orange and highlighted Hempstead Avenue. At the time, it was all open farmland beyond the tight town center.

Center of Town

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Hempstead had its start in 1644 when dissident Puritans John Carman and Robert Fordham received permission from Dutch authorities to “purchase” land from the local Natives to establish a town. Its name is likely inspired by the English town of Hemel Hempstead, where Carman was born, although the Netherlands had the town of Heemstede whose name is similar to this one. The settlement’s grid was laid out between two branches of Mill River and while the streets are still there, the headwaters of the stream were later hidden beneath the surface.

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In this 1873 F. W. Beers survey, the western branch of the stream has two ponds preserved within parkland while the eastern branch flows undisturbed along Clinton Street. The Hempstead railroad terminal is on Fulton Street but the proposed rail line on the south side of town was never completed. It extends today only to West Hempstead.

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Looking at an aerial survey of downtown Hempstead today, I highlighted its main east-west routes: Fulton Avenue (NY-24), Front Street (NY-102), and Peninsula Boulevard. Running north-south are Franklin and Clinton streets. With the postwar growth of suburban tract housing and corporate campuses, the old downtown experienced vacancies. Much of the streetscape is what Streetsblog would describe as parking craters, wide open paved spaces in the hearts of American cities. The blue lines are illustrations of where the two branches flowed before being forced underground.

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Can one imagine a daylighted Mill Creek flowing across this lightly used parking lot in Hempstead’s downtown?

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Looking at the town’s official zoning map, the hidden branches of the river are highlighted in faint blue, serving as property lines. The town is planning on redeveloping its parking craters into a lively downtown core, but looking at the current plan, daylighting Mill Creek is not in the works here. On the extreme southwest on this map Mill River breaks onto the surface.

East Branch


As it is with Simonson Creek, very often the headwaters of suburban streams were tapped by water companies with wells in the 19th century with water towers in the last century. The tower of Hempstead Water Works stands on Dartmouth Street and Clinton Street near Brierley Park. On the old maps, this property is where the stream began. to be certain, I circled around Brierley Park to its northeast tip at Wellington Street.


A slight dip in the landscape indicates a likely source for Mill River here, the furthest point from its mouth.


Leaving Brierley Park, I followed the course downstream. At Yale Street, it runs through a concrete channel that has been reclaimed by vegetation. This street parallels with Cornell, Amherst, Dartmouth, Wellesley, Princeton, Harvard, and Columbia- the elite Ivy League schools that give this subdivision an air of sophistication. How about we name a CCNY Street in honor of my alma mater, and for diversity, how about some HBCU schools?


It was a rainy day for suburban exploring but the streambed hardly had any water running, indicating that most of the surface runoff goes into the sewers and with concrete walls, very little groundwater enters this channel.


With so little water running on the stream bed, I was tempted to enter its underground section at Columbia Street, but it would be quite a long walk in the dark before Mill River sees daylight again at Tyler Avenue. Along the way, it flows beneath Hempstead Town Hall, and the Hempstead Village Commons strip mall. At Franklin Avenue, the two branches merged into Mill River. Crossing this street, it flows beneath a manufacturing district of car washes and repair shops.

Atop the Tunnel


Beyond Franklin Avenue, the underground stream flows through a channel that is evident on the surface as an alley and as a concrete paving on streets that cross the stream, as seen on Madison Avenue near Peninsula Boulevard.


It is difficult to imagine a river flowing between these properties but perhaps at some point in the future this alley will either see a building on it, or a daylighted stream.


When it isn’t an alley atop the buried stream bed, I also look for streets that are interrupted mid-block by a thin strip of grass. In many cases street grids were laid without the streams in mind. After the streams dry up or descend underground, the interruptions in the grid remain, as seen at Polk Avenue at Ashdown Place.

To the Surface


At Tyler Avenue, at long last Mill River shows itself in daylight. I was surprised to see how easy it is to enter the concrete tunnel. I am not bold enough for (sub)urban spelunking, but if it is your thing, consult with Steve Duncan.


Looking downstream from this portal, this site could be developed as a park, but before that is done, the stream bed would need a thorough cleanup.


Atop the portal on Tyler Avenue, the concrete paving indicates the stream. From this point, Mill River leaves town, flowing through the wooded campus of Hempstead High School.


Hardly any water is seen in Mill River at the high school campus. It then enters the protected forest and wetland of Hempstead Lake State Park.

Hempstead Lake State Park

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Mill River experiences its most naturalistic appearance within this state park, where it flows through four ponds. As it is with natural parks, state parks receive their designation in part because of the sites’ roles in the history of the state and their unique visual aspects. Hempstead Lake was created as a drinking water reservoir for Hempstead and later for the city of Brooklyn.

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Hempstead Lake appears for the first time on a map in 1868, with a gristmill trapping the water. The West Hempstead Historical Society notes that Eagle Avenue that leads into the State Park has a namesake relating to Mill River: William F. Oliver’s Buckwheat Gristmill which stood on the East bank of the Mill River opposite end of Eagle Avenue. The mill was established in 1850, the largest gristmill on Long Island at the time.

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In 1872, the millpond was expanded to hold more than 8 million gallons of water, connected to the Brooklyn Water Works conduit. On the map above, I highlighted Hempstead Turnpike, Front Street, Hempstead Avenue and Peninsula Boulevard as references. Following the 1898 absorption of Brooklyn into New York City, this reservoir became obsolete as a source of water. Within a generation it found a new use as the center of a state park.

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In 1925, the Long Island State Park Commission released its report proposing to repurpose the reservoirs at Hempstead Lake and Valley Stream as state parks, anticipating the population boom on Long Island. Once linked by an aqueduct, these reservoirs-turned-parks will be linked by the Southern State Parkway. The state parks and parkways were both products of master planner Robert Moses, the famed “power broker” who also served as Commissioner of New York City Parks.

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Unlike the island’s expressways, its two east-west parkways offer winding routes with generous forested shoulders, and stone arch overpasses that give the impression of driving through a park. At Hempstead Lake, the parkway used to take a sharp detour around the lake before it was straightened in 1949, as seen in the above New York State Archives photo. An earthen dam carries the highway, with the smaller remnant of Hempstead Lake designated as Northwest and Northeast ponds. The old parkway bypass on the east bank of Hempstead Lake was absorbed into Peninsula Boulevard (Nassau County Route 2)

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Even with this reduction in size, Hempstead Lake is the largest freshwater body in Nassau County. In its size and function, it is reminiscent of Meadow Lake in Queens, also a park centerpiece and the largest lake in New York City. It is a deep lake used for fishing and boating, but not swimming. The only freshwater beach on Long Island is on Lake Ronkonkoma.

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A 1940 postcard from Hempstead Lake State Park shows a model boat pond carved from Mill River. Notice the parking lot behind the hedges. The automobile made Long Island what is is today, transforming it from potato fields and duck farms to seemingly endless tract housing for the middle class.

From Hempstead Lake, the water flows into the smaller McDonald Pond, named after a heroic local resident, NYPD Detective Steven McDonald. This is the former model boating pond appearing in the above postcard. The stream then enters South Pond, the final lake (former reservoir) within this state park. The next lake downstream is Smith Pond inside Rev. Morgan Days Park, which is operated by the Village of Rockville Centre. The park’s namesake was the pastor of Shiloh Baptist Church, the oldest black Baptist church on Long Island. Rev. Days served at its pulpit from 1937 through 1985, an activist who fought for civil rights and against segregation. The stream goes underground to accommodate the ramps connecting Merrick Road and Sunrise Highway, then emerging again on the surface as a border between Rockville Centre and Lynbrook.

Platforms on the East Rockaway station on the Long Beach Branch has the distinction of spanning across Mill River at the point where it becomes a tidal inlet.


Atlantic Avenue is the final bridge across Mill River, where a new townhouse and condo complex, Marina Pointe was built in the last decade. The design of these homes gives them a historical appearance. Residents have access to a private dock and walkway on the water’s edge. Continuing south, Mill River is lined with docks as it widens, merges with Powell Creek in Oceanside, and empties into Hewlett Bay.

Tidal Section of Mill River

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Most maps relating to Living With the Bay show projects along Mill River downstream from Hempstead Lake, but the detailed report outlines its watershed with a variety of solutions. Selected streets within the watershed will receive permeable paving and bioswales; a greenway trail will follow the river as closely as possible; and the stream bed will be cleaned and dredged to improve drainage and flow.

On this map, Smith Pond is on the top. The river currently goes underground afterwards with the interchange of Sunrise Highway and Merrick Road above it. It then reemerges on the surface at sea level, with a mix of saltwater. It flows on for another mile before widening into Hewlett Bay, which is buffered from the open ocean by Long Beach Island.

Resiliency on Mill River

The full Living With the Bay report is quite lengthy (64 pages) in offering recommendations for managing catastrophic storms. Four panels in particular concern the visible portions of Mill River, and one for its tributary Pine Stream.

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At Hempstead High School, the plan calls for widening the riverbank, clearing it of invasive vegetation and installing geotextile to stabilize the stream.

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At Hempstead Lake, the state proposes dam improvements, habitat restoration, boat and kayak launches, and an education-focused visitors center. A long-neglected state park is seeing improvements. It is unfortunate that it had to take a massive storm to raise awareness and funds for this park.

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In the village of Malverne, the Pine Stream tributary would receive a restored wetland near the Malverne High School campus, while remaining underground as it flows past the school’s athletic fields. Nearby streets would receive the green treatment with paving and sewerage designed to absorb storm water, reducing the amount flowing to water treatment plants.

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Pine Stream flows into Mill River at Smith Pond, the centerpiece of Rev. Morgan Days Park. Here the plan involves dredging the pond, eliminating invasive vegetation, and the construction of a fish ladder and public overlook.

In many ways the state’s plan for Mill River resembles the Bluebelt program that transformed and restored the streams on Staten Island’s South Shore. I believe that Living With The Bay should not be limited to Mill River. Its recommendations should be adopted for all streams on Long Island.

Within the Town of Hempstead, flowing parallel to Mill River are Simonson Creek, Motts CreekValley Stream, Millburn Creek, Meadow Brook, Bellmore Creek, and Seaford Creek. They are listed from east to west, all of them flowing south towards the ocean. All of these could be featured in a Hidden Waters of Hempstead book, if there is a demand for such a book. Until then, if the Town or the State are looking for a historical consultant on these waterways, I would be happy to explore them and post their histories here.

Learn More:

The Nassau County Department of Parks, Recreation and Museums has a list of County-operated parks situated alongside streams. Town of Hempstead has its own online list, but it does not offer the history of its parks. The state has its dozen parks on Long Island, some of which have their own hidden streams.

South Shore Blueway has a map of local streams accessible by kayak, along with places to launch kayaks into the water.

In the News:

Times Ledger reports on the restoration of Sunset Cove in Broad Channel, Queens.


18 thoughts on “Mill River, Hempstead NY

  1. WILLIAM I MAXWELL December 2, 2017 / 1:09 am

    I would like to communicate with Sergey about Pine Brook in West Hempstead. I grew up near the stream when it ran in its natural streambed through a corridor of woods. I have some theories about and would like to explore the possible sources of Pine Brook


    • Cicero May 17, 2022 / 5:41 pm

      Hi does anyone have any photos of the original water tower that stood at the water works on Clinton St. from 1910 to 1985? It was a really cool looking tower. I don’t like the new one that stands there now. It was built in 1985. I miss the old tower in Rockville Centre also! They were all taken down by 1994. Sucks ! I love early 20th century steel contstruction.


  2. steven vilardi East Rockaway NY November 27, 2018 / 1:48 am

    Nice pleasant report but one illustration was printed backwards. It is the one below the post card of the sailboat pond. From Sunrise highway down to Hewlett Bay is printed in reverse. Notice the Long Beach Rail road line and the direction of it.


  3. Alene Scoblete April 7, 2019 / 2:51 am

    Would you happen to know where the model yacht basin that was carved out of Mill Pond in the 1940s was exactly? I am researching that postcard and am looking to pinpoint that spot. Thanks for your help.


    • Sergey Kadinsky April 8, 2019 / 12:53 pm

      it was in Hempstead Lake State Park, southern part of the park.


      • Steven vilardi April 9, 2019 / 9:25 am

        Yes the yacht basin is still there but nobody sails on it anymore. The boats that were used there were not radio controlled sailboats. . The entrance to the area parking lot was right on a dangerous curve on peninsula Blvd right where the southern most walk bridge is located. The pond was used in the winters as an ice skating location. Seasonally the pond is stocked with fish for a park event.

        Currently radio controlled power operated model boats are motored in the pond just north of the SS pkwy. The entrance is a tricky location on the west bound entrance ramp of the SS.


  4. Sue May 3, 2019 / 3:09 pm

    Very interesting. I lived in East Meadow when I was 10 to 12 years old and we always explored. This was a great story. Thanks


  5. LAURA B August 17, 2019 / 9:06 pm

    My house and the one next door were built 20 years ago on what had been a wooded property on the other side of Peninsula Blvd from McDonald Pond (in Hempstead Lake State Park). We have an inexplicable “line” of flooding running through our properties. Every time it rains, we end up with standing water in the grass. I jokingly told my neighbor I think there’s an underground stream and she said before the houses were built, she had indeed heard there was a stream on the property. She thought it was a myth, but now I’m wondering!


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