Frequently Asked Questions

Q: What is the project?

The Round Valley Reservoir Structures Refurbishment and Resource Preservation Project is making improvements to extend the operating life of the Round Valley reservoir.

Q: Who is in charge of the project?

The project is controlled and led by The New Jersey Water Supply Authority.

Q: What is the project going to do?

The project will refurbish the reservoir structures with state-of-the-art design standards and construction techniques. The project will extend the operating life of the Round Valley reservoir, which is the largest drinking water supply by volume in New Jersey.

The success of the project will be vital to the State’s ability to sustain prolonged droughts by increasing this vital reservoir’s structural durability. This improved resilience will help ensure supplies of drinking water for future generations.

The Round Valley Project entails a number of components including installation of improved drainage systems on the embankments, abutment grouting, dredging the channel where the reservoir is filled, security upgrades, instrumentation upgrades, and a number of other structural and mechanical improvements. For additional information about the project components, please view our video here and/or our public presentation here. The project timeline is located here.

Q: When will the project start and end?

There are a number of project components that will be undertaken on different timelines. The New Jersey Water Supply Authority anticipates that major construction work will begin in 2018 and conclude by 2021. Additional project timeline details will be announced here as soon as the information is available.

Q: Will the project affect people who use the reservoir for recreational activities?

Construction efforts are scheduled to minimize disruption to the public’s use and enjoyment of all that the Round Valley reservoir has to offer; however, certain disruptions may be unavoidable. The details of these activities will be announced as soon as the information is available. It is possible that project efforts will require the lowering of the reservoir level, which could impact boaters and fishermen. The reservoir level may also be naturally lowered during drought conditions when more water is used, as occurred in 2016. The New Jersey Water Supply Authority adds water back into the reservoir by pumping when conditions permit. Whether additional, Project-related lowering will be necessary is yet to be determined. More information about reservoir levels, releases, and the current drought status, is available on the Authority's website.

The Cushetunk trail crosses through a restricted area of Round Valley which will be under construction during this project. Due to the nature of construction activities in that area (many trucks crossing, active earthmoving equipment, etc.), we have to plan for the safety of the public and workers as well as for the safety of the dam. The trail may be re-routed and/or temporarily closed. All closures will be announced on this website and our email list as soon as the information is available. Signage will be posted in the vicinity of the closure and/or reroute and in the Park office at Round Valley. You can join our mailing list to receive periodic updates via email by clicking here.

Q: Will the project affect local drinking water usage?

The Round Valley reservoir is connected to natural river systems, which enables water to be stored and moved around within the reservoir’s service area of central New Jersey. Balancing the needs of everyone that relies on this water is a critical part of the New Jersey Water Supply Authority’s work, especially given the drought that began in 2016. The reservoir provides a drinking water source for 1.5 million residents in central New Jersey and decisions to lower the water level are taken very seriously. With this in mind, the Authority is scheduling the project in close coordination with the Division of Water Supply and Geoscience of the New Jersey Department of Environmental Protection.

Round Valley reservoir is part of a larger water supply system supply called the Raritan Basin system, which also includes the Spruce Run Reservoir. Additional information about the Raritan Basin system can be found on the Authority’s website.

Q: Will there be any public meetings?

Yes. The New Jersey Water Supply Authority hosted a Public Information session on November 14, 2017. The information presented at the meeting is available here. If additional meetings will be held, announcements will be posted here and via our mailing list.

Q: How long will the public road be closed by the North Dam? Will it also be closed to pedestrians and bicycles?

The segment of Route 629 that crosses the dike is expected to be closed for 3-4 weeks for the grouting project and 8 months – 1 year for the embankment project. It will be closed to the public entirely. The segment planned for closure is shown here. The current project timeline is shown here.

Q: What will the truck routes be? Will trucks be traveling Molasses Hill Road?

The trucking routes are shown here. There will be no heavy truck traffic related to the project on Molasses Hill Road.

Q: As part of the project will there be any new pipes put in under Old Mountain Road?


Q: In the embankment rehabilitation part of the project, why wouldn’t all embankments be worked on at the same time to limit impacts on roads and users of the park?

We are considering concurrent construction as well as sequential construction and no decisions have been made as of November 2017. Impacts to the public associated with both options are part of our analysis. There are pros and cons to both approaches. The current project timeline is shown here.

Q: How much are you dredging? How long, deep, and wide will the channel be by the south tower?

The length of the dredging project will cover approximately 800 feet. The depth of sediment to be removed ranges from 3’ – 15’ and we expect to remove more than 7,000 cubic yards of silt. The dredging is being done simply to restore the trench to its original design capacity. The bottom of the trench is approximately 25 feet wide. The proposed final elevation ranges from EL 349 (closest to the tower) to EL 338 at the point farthest from the tower. Full pool elevation is EL 385.

Q: How and where will the dredged material be disposed? Does it contain heavy metals?

The material will be placed into a “confined disposal facility” along the shoreline of the reservoir where it will be dewatered. It will remain there and, once dry, will be stabilized with planted vegetation. A total of eight sediment samples were taken to represent the length and depth of the dredging limits. USEPA and NJDEP environmental sampling, handling and shipping protocols were followed throughout the process. The samples were analyzed for petroleum hydrocarbons, heavy metals and the list of organic chemicals that is the standard for environmental investigation. Results for all eight samples were below or were typical of “background” levels as reported by NJDEP.

Q: Will the dredging of the inlet channel impact water quality?

In-water silt curtains will be used to contain the material, so the impact to water quality should be very temporary and very localized to the dredge site, and therefore very minimal.

Q: What will happen to the hole that is drilled to inject the grout? Will it be filled in when the project is complete?

Yes, the hole is filled with grout after the grout reaches the bottommost point (in bedrock). Pipes and/or sleeves used while drilling the grout holes will be removed as the hole is filled with grout.

Q: Will drilling have an impact on residents and will it affect local wells?

The drilling and grouting operations will be performed under applicable NJDEP requirements, including N.J.A.C. 7:9D, to comply with regulations related to potential impacts to groundwater quality and local wells.  These operations will also be reviewed by NJDEP, Bureau of Dam Safety, as part of the overall dam rehabilitation project. Noise levels associated with drilling are also regulated and should not be disruptive to neighbors.

Q: Will the reservoir be lowered for construction?

It is very likely that the reservoir will need to be lowered, but only for the aspects of the project that involve earthwork on the embankments. The worst-case scenario for pool elevation lowering for construction is 25’ lower than full pool (full pool is EL 385). This level is comparable to the elevation during the summer of 2016 when the pool was down due to water usage. If drought occurs during construction and additional releases are necessary for water usage, the pool would naturally be reduced beyond the planned maximum of 25’ (EL 360). The current project timeline is shown here.

Q: When do you anticipate lowering the water level and how long will it take to lower?

We expect that our consultant will provide target reservoir levels that may be necessary for the embankment rehabilitation sometime in the first or second quarter of 2018. At that time Authority staff will formulate a drawdown schedule as may be necessary. The current project timeline is shown here.

Q: What are the conditions at the Round Valley boat launch?

The Round Valley boat launch is maintained by the NJ Department of Environmental Protection’s Division of Fish & Wildlife. The Authority has no additional information on the conditions at the boat launch. As reservoir water levels fluctuate, the Division of Fish & Wildlife makes efforts to accommodate boats. Real-time reservoir water level information is available at NJWSA Operations Report and here.

Q: Can the boat ramp(s) be extended with concrete?

That decision is not up to the Authority as we do not operate the boat ramp(s). We will continue to keep the Division of Fish and Wildlife aware of anticipated reservoir levels.

Q: Will there be any boating restrictions during construction?

The Authority does not anticipate any boating restrictions during construction, unless they are dictated by reservoir pool elevation. For security purposes, there is a chance that the restricted areas near the embankments may be extended.

Q: With the reservoir so low, boaters to the camp sites have a difficult time beaching their boats to walk to the camp sites because of silting around the exposed shore line. The silting is a safety issue. Will this be addressed during the project?

The wilderness campground area is operated by the State Park Service and questions or concerns about it should be directed to them.

Q: What is the pumping schedule for filling and releasing water from Round Valley?

There is no set schedule for pumping. When and how much water is pumped into Round Valley is based on a variety of factors, the most critical of which is the presence of sufficient flow in the South Branch of the Raritan River, which is dependent on precipitation and other upstream withdrawals of water. Pumping is less effective when there is freezing in the river and intake pond. Pumping in the summer months is rarely done because flows in the river are low at that time.

Q: How much will this cost and how will it be paid for?

The construction cost as of November 2017 is approximately $75,000,000. It will be paid for by the water customers through their water rates. No tax money is involved.

Q: How much does it cost to fill the reservoir?

It costs approximately $100,000 per billion gallons.

Q: How long until all the work is complete?

The worst case scenario, according to the schedule as of November 2017, would have all work being completed by the end of 2021. The current project timeline is shown here.

Q: How can I contact a representative for more information?

To contact a project representative via email or phone, please click here.