Waterlevel & Dam

The waterlevel of Manchaug Pond is of utmost importance to the health of this lake ecosystem, the quality of life for year-round and seasonal residents and tourists, the safety of property and residences along the shoreline and downstream, and the maintenance of water in-lake and downstream flow feeding dependent fisheries, drinking water sources, water-dependent businesses. Key to maintaining the proper waterlevel is the Manchaug Pond Dam which is now owned, operated, and maintained by the Town of Sutton.

THE WATERLEVEL:
What’s happening at the pond!

2017

Winter Lake Drawdown: Adjustments/arrangements should be made for docks and boats along the shoreline as the drawdown process begins. Public access through the state boat ramp is not impacted by the drawdown.

October 10th: Low-level gate opened just a few inches to slowly start the draw-down process letting out of Stevens Pond as well. Dam caretaker relates a recordable drop will show in about a week, with the water-level dropping an inch or two per day after that. By early January the lake will reach an anticipated low of between 4.5 and 6 feet.
~ October 3rd: At 10 inches below full due by enlarge to a lack of rain and evaporation. Last year were were 13 inches below and the year before 8 inches below.
~ September 18th: Lack of rain and evaporation has brought down the waterlevel a few inches. Tropical storm Jose is expected to bring an inch or so of rain to the area Tuesday-Thursday.
~ August 21st: This morning’s reading has Manchaug Pond just below FULL by 1 and 1/2 inches. Thank you Town of Sutton for maintaining a great level all season!
~ August 13th: With rain in the forecast, the dam low-level gate was opened a bit as we have been averaging about 3 inches over full. Steven’s Pond is also a consideration.
~J une 11th:Manchaug Pond remains at FULL+ with low-level gate closed to reduce flow today in effort to conserved water as hot weather arrives. Thundershowers in the forecast for Tuesday.
~ May 15th:Weekend rainfall and watershed runoff has put Manchaug Pond and Stevens Pond over the “full” mark. Manchaug Pond serves as a reservoir capturing rain and run-off to prevent flooding downstream and for use through the drier months. Today the dam low-level gate was opened more and high water is flowing nicely over the flashboards through the spillway. The dam caretaker is monitoring the level closely for both ponds.

Manchaug Pond Foundation

April 18, 2017, Public Boat Ramp

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~ May: Lake is at full+, ready for the season with shoreline, coves and wetlands renewed.
~ April 5th:  Waterlevel is  quickly rising with continued rainfall, snowmelt and runoff from the watershed.  The channel wall is now submerged.  Docks are in water ready for boats!
~  March 26th:  Remainder of the ice is gone, fully opening the public access boat ramp to boaters.
~  March 15th:  Low-level gate is open in order to prevent dock damage as cold temperatures cause ice to form along the shoreline. The significant snow cover in the watershed from this week’s storm is good for the lake as the spring snow melt will be captured to increase the waterlevel of the reservoir for the drier summer season.
~March 14th: End drawdown to begin filling the reservoir. Waterlevel is about 10 days ahead of last year at this point.
~ March 1st:  Flashboards in, ice out, ready for refill.

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Frequently Asked Questions:

  • Who owns the Manchaug Pond Dam?   The Town of Sutton owns the dam while the Manchaug Pond Foundation holds the deed to the flow-rights of Douglas and Sutton.
  • Who maintains the dam?  The dam owner maintains as needed.
  • Will another flashboard be added to the dam spillway?  No, the current number of flashboards are for normal operation and to get us to “full.”
  • Who decides if the gate is open or closed?  The dam caretaker makes that determination with input from the Manchaug Pond Foundation.Many variables are considered from the weather forecast, to the presence/absence of snow cover in the watershed and ice cover on the lake, to runoff and saturated soils or lack of in the surrounding watershed. Whatever the situation, you have a voice as the Manchaug Pond Foundation who works closely with the town. Waterlevel issues affect public safety, the health of the lake ecosystem, needs of shoreline properties, public access and recreation, flood prevention, drinking water wells and septic systems, control of invasive aquatic species, and more.
  • Why is the dam low-level gate open … or closed?  Possible reasons include winter lake-level drawdown, maintaining spring/summer season FULL, a rain or a storm event in the forecast, the low-level gate needs to be flushed, dam maintenance to be performed, or downstream work on the Steven’s Dam or a change in their water needs.
  • Is the dam safe?  The dam undergoes regular inspections both informal as part of its daily operation and formal as part of the requirements of the Massachusetts Office of Dam Safety.
  • Who can I contact with a question or concern?  Ask it here! We field  issues and concerns of the property owners and user-community serving as the liaison with local and state regulating agencies.
Drawdown allows for the desiccation, freezing and physical disruption of plants, roots, and seed beds around the shoreline.

Lake-level Drawdown

WHEN?

Winter Drawdown:

Mid-October the annual drawdown begins to allow for amphibians, reptiles and other aquatic organisms to move to deeper water before ice formation and substrate freezing and to provide fall recreational opportunities. The water level will drop at a rate of approximately one inch to two per day, to achieve an approxiamate total level of 5.5-ft. below normal pool with the process completed by December 1st.

Lake Refill:

March-April: Lake refill must be achieved by April 1st to provide a stable pool elevation and habitat for spring spawning and connectivity with watershed in-flowing cold water fishery streams.*

WHY?

Flood Control:

The lower winter waterlevel provides storage capacity for runoff from unusually high precipitation and snow-melt events.

Dam Maintenance:

With the upstream face of the dam exposed, inspection and maintenance can be performed as needed which would include re-pointing and facing of the concrete.

Invasive Species Control:

Since 1990, the Manchaug Pond Foundation and its parent organization, the Manchaug Pond Association, has worked with the dam owner to employ lake-level drawdown as the best option for controlling aquatic invasive species. Lycott Environmental’s Lee Lyman, a pioneer in the management of ecological systems, first recommended tweeking the timing of our annual drawdown to both protect native species and to control unwanted invasives.   Providing the weather conditions are conducive, historically the water level is drawn down during the middle of September and no later than mid October and at a rate of approximately one to two inches per day to minimize impacts to downstream environments and to allow certain aquatic organisms such as fresh-water mussels, crayfish, turtles and amphibians to migrate to deeper portions of the water body to overwinter and brought back in March and April. Drawdown allows for the desiccation, freezing, and physical disruption of plants, roots, and seed beds around the shoreline. In addition to reducing the growth of non-native invasive weeds such as Fanwort and Variable Milfoil, Manchaug Pond Foundation notes successful control/elimination of Asian Clam at the state public access boat ramp.   A look at Manchaug Pond’s bathymetry  shows how lake-level drawdown can be an effective method for aiding in the management of aquatic vegetation in the shallow shoreline areas of lakes and ponds.Manchaug Pond Foundation

THE DAM

Purpose:

While the waters of Manchaug Pond Reservoir are no longer needed in the manufacturing processes of downstream textile mills, today the importance of the 380 acre reservoir and its dam are no less important and are found to be farther reaching:

  • provides required minimum, continual flow in the Mumford River supporting aquatic species;
  • supplies storage capacity to attenuate flooding concerns on-lake and downstream;
  • provides and enhances fisheries and wetlands;
  • ensures connectivity with in-flowing coldwater fishery streams;
  • allows year-round recreational opportunities benefiting tourism;
  • provides higher quality of life in this corner of the Blackstone Valley and Commonwealth.

Operation & Maintenance:

Visual inspections of the dam are made with daily water surface elevations and precipitation levels recorded and necessary adjustments made to the low-level gate and flashboards/stoplogs in compliance with the Conservation Commission and Mass DEP orders.

Annual maintenance includes cutting of the grass-covered earthen embankment twice a year. Re-pointing with concrete of the upstream stepped-face’s stone-masonry wall is done as needed. In compliance with Massachusetts Office of Dam Safety regulations, a Phase I Inspection/Evaluation is conducted every other year by an outside engineering firm.

In 2006 the low-level gate mechanism was replaced with steel construction and the operator’s platform renovated.

Repairs to the spillway box culvert were made in the years 2005, 2008, 2009, and 2013.

2015 new flashboards/stoplogs were installed.

Repairs to low-level gate in 2006
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Overall Structure & Construction

Manchaug Pond Foundation Waterlevel & Dam

2010 Aerial of Dam with Torrey Road at crest.

Originally constructed in 1836 by downstream textile mill owners, its primary purpose was to impound the pond creating a reservoir to provide the mills with a continuous flow through the year.  In 1960, extensive improvements were made which included widening and raising the dam crest, constructing the downstream earthen embankment, replacing the overflow spillway, expanding the low-level outlet, and accommodating Torrey Road.

Today, Manchaug Pond Dam stretches 330 feet long, 28 feet high, and 36 feet wide with Torrey Road at its crest and sits in the town of Sutton, Massachusetts, U.S.A. at Latitude 42.09048 N   Longitude 71.76630 W. The upstream side of the dam is a stepped-face stone-masonry wall made up of large stone blocks with joints mortared with concrete. The downstream slope is a grass/vegetation covered earth slope constructed in 1960’s.

  • Manchaug Pond Foundation Dam

    Dam viewed from Holt Road

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    Upstream side made of stone-masonry

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  • Looking south toward low-level gate

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  • Earthen downstream side

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Spillway

The overflow spillway was constructed in 1960 when extensive improvement were made to the dam.
Primarily a reinforced- concrete box culvert, it extends from the upstream side through the center of the day to the downstream side measuring approximately 10 feet. wide by 9.35 feet high.

2016: On February, 26th, new flashboards installed made of thick, red oak. Two flashboards were significantly damaged by a beaver in 2015.

  • Manchaug Pond Foundation Waterlevel & Dam

    Spillway with cage on upstream side

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    Spillway/culvert box opening with flashboards.

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    Culvert box of spillway as seen from upstream

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    Water flow over spillway flashboards

Low-level Gate

The low-level outlet is comprised of a hand-operated gate which opens to a 2 ft. by 2ft. stone conduit through the dam structure enlarging to a 2-ft. by 3-ft. high reinforced-concrete outlet on the downstream side of the earthen embankment, added during the 1960 construction.


Sources:
Drawdown Performance Standards for the Protection of Fish and Wildlife Resources. Approved September 23, 2002, Massachusetts Division of Fisheries & Wildlife.