Category: Pawtuckaway Lake

On Monday this week (March17) the NH Department of Environmental Services observed a sinkhole on the crest of Dolloff Dam on Pawtuckaway Lake. A small depression was observed in the vicinity of the sinkhole last year but over the course of the winter this depression appears to have developed into a sinkhole. A sinkhole can be a significant issue on any dam and warrants immediate investigation. A sinkhole in a dam is primarily caused by water running through the soil material in the dam and that water eroding the internal dam material. If left unchecked, this could lead to increasing erosion and loss of the structural stability of the dam.

In the case of Dolloff Dam, leakage has been historically observed on the downstream side of the dam in the area of the sinkhole, however, this leakage has never been associated with internal erosion. While NHDES does not feel that the stability of Dolloff Dam is of concern at this point in time, more investigation is necessary to determine if that leakage is creating a situation where material is being moved from within the dam.

During a site visit on Tuesday (March 18), several voids were observed in the concrete on the upstream side of the dam which may be leading to water flow through the dam. NHDES will be lowering Pawtuckaway Lake, possibly as much as to the historic winter drawdown elevation of seven feet, so that these voids can be filled with cement. While this will help with the situation, NHDES does not believe that this will solve the issue. 

The lowering of Pawtuckaway Lake will occur with the use of the discharge mechanisms at Dolloff and Drowns Dam and will likely take one to two weeks. At that point, NHDES will mobilize to repair the concrete which will take approximately one week. Once repairs are completed, and further investigation is conducted, NHDES intends on starting to refill Pawtuckaway Lake to the full summer elevation. However, if further investigation reveals that there is a risk of further sinkhole development if the impoundment is increased, then NHDES may have to keep the impoundment at its lowered elevation. As many of you know, NHDES is currently working with an engineering consultant to review the deficiencies of all four Pawtuckaway Lake Dams and to come up with an overall rehabilitation design for all four structures. NHDES will be working with that consultant to perform further investigations, such as diving and camera work, to prepare a plan for refilling Pawtuckaway Lake.
Thanks to Corey for keeping us in the loop!

The Town will be asking for a loan from the State to fund a watershed study for Pawtuckaway Lake but the loan principal will be forgiven when the watershed study is finished so the Town will not owe any money. All the interest that accrues during the term of the loan will be paid for by the PLIA.

Read the following paragraphs for additional information.

What Does it Mean?

The Warrant Article, if passed, allows the Town to apply for a Clean Water State Revolving Fund loan. The funds will ultimately be used to pay for an updated watershed plan for Pawtuckaway Lake. Even though the loan, if granted, will have the principal ultimately forgiven, state law requires that the Town must have the authority and ability to repay as if the loan were not going to be repaid. That is the reason why the Warrant Article mentions that the Town would be authorized to issue bonds to repay the principal of the loan even though it would not be needed in this case. The Warrant Article also states that the PLIA will pay any and all interest on the loan. It is estimated that the total interest would be around $1500-$2000. It also mentions, in addition to doing the watershed plan, the possibility of doing some mitigation actions. If done, these would be quite small activities, more in the nature of feasibility studies than the relatively major mitigation activities that might be specified in the watershed plan.

What is it For?

The PLIA would like to update our watershed plan which was last updated in 2008. While a watershed plan has many parts, in essence its purpose is to determine the factors which affect the health of a water body and recommend mitigation actions to improve it. While we have several reasons for wanting this update, the primary reason is to determine the factors which are leading to an increasing level of phosphrous in our lake. While any excess nutrients in the lake are a problem, phosphorous in particular, can lead to bigger and more frequent cyanobacteria blooms. We had two such blooms last summer leading to recommendations to stay out of the lake for periods of time since they can cause serious illness and possibly even death. With an updated plan we can understand the most effective mitigation actions and actually get a start on the major mitigation work.

Why a Loan?

Developing watershed plans is a complex activity and requires hiring experts to do the work in conjunction with information from local residents. The cost to update our plan is estimated to be between 65K and 100K. We hope to get the necessary funding from a federal program, the Clean Water State Revolving Fund (CWSRF), which is administered separately by each state. In NH these loans have to be given to a town rather than a lake association or other non-governmental body.

How Does it Work?

As stated above, the way NH administers the program is to provide the loan to towns. These loans are like lines of credit in that interest accrues only as the money is requested by the town. When the purpose for the loan, namely an updated watershed plan, is complete, the Town informs the State that the loan should be closed. Having fulfilled the loan purpose, the State then forgives the principal. The net result is that the only thing that is owed to the State is the interest on the loan.

Summary

The Town will be asking for the money directly but the PLIA in consultation with the Town will engage a consultant to actually perform the work. The key here is that the Town is required by the terms of the loan program to be the middle man but the Town incurs no financial obligation other than a tiny amount of administrative work. Of course, none of this is a guarantee that we will qualify for the loan even if approved by the town voters. If the Warrant Article is approved, we will work with the Town to provide a pre-application to the State by May 31st. After a vetting process to determine loan candidates, the actual loan applications are due in the fall.

Cynaobacteria blooms are increasing in many New Hampshire lakes and our lake is no exception.  Last  year we had at least two such blooms that were verified by NH DES, one almost impacting the busy July 4th week.  In 2023,  Lake Kanasatka had a bloom that lasted 121 days, effectively shutting down lake activities for most of the summer and into the fall. Cyanobacteria can cause serious health issues and even deaths in rare cases. They are caused by several factors, most notably increasing phosphorous levels and rising average lake temperatures due to climate change.  Phosphorous enters the lake primarily from water runoff from the land. This phosphorus loading is increased by actions such as fertilizing lawns, cutting down shoreland vegetation, using impervious surface materials, and not controlling erosion.

The PLIA is concerned about the increasing phosphorous levels in the lake and is working with DES, state and town officials to apply for grants to update our watershed plan. Our most recent plan was developed in 2008 and there have been many changes to the lake since then. The PLIA applied for a so-called “604B” grant last fall but we were not successful. This spring we intend to apply for a Clean Water State Revolving Fund grant from NH DES.  If we do get the grant, we plan to engage a contractor to update our watershed plan. The plan will cost around $70K and will take at least a year to produce.  With a new plan in hand, we will be able to request additional grants to perform mitigation projects to reduce incoming phosphorous and, we hope, lessen the potential for future cyanobacteria blooms.

All lake resident can also help in this effort by reducing property runoff, eliminating the use of fertilizers, making sure their septic tanks are functioning well, and protecting shoreline vegetation.

This year the Boat Parade was a riot of color and themes! There seemed to be more decorated boats than ever (did anyone manage a head – er – boat count?)

Movies and programs were represented from South Pacific to Dumb and Dumber to the African Queen to Sponge Bob. Pirates, ice cream truck, flames, undersea creatures, mushrooms, love, ice hockey, water gun Olympics, bubble bath, alien invasions, flamingo, antique boat, and Legos also made an appearance. Not to mention plenty of good old-fashioned Stars and Stripes!

Water blasters were in great abundance and participants cooled off from the hot weather by directing streams of water at each other. Responses to water cannons on board came from all directions, including a powerful challenge launched by “spectators” on docks and rafts around the lake.

Photos taken by residents and PLIA members have been collected and posted here for your enjoyment. You can also look at this and past years’ boat parade photos on this website, here. Thank you all, for a fun and safe boat parade – one of our favorite traditions!