11/20/06
American Whitewater (AW) along with its affiliate club organizations the Merrimack Valley Paddlers (MVP) and New Hampshire Appalachian Mountain Club (NHAMC) are requesting a new lake level management plan to enhance downstream recreation on the
A panel consisting of representatives from the Lakes region was set up to look into and recommend changes to the level management of Lake Winnipesaukee and associated lakes. The impetus for this has been the flooding over the last couple years with "no wake" rules being instituted, access under bridges, etc.
The panel is considering dropping the maximum lake level target several inches (maybe up to 6"). What we are asking for is to limit that drop to include 3-1/2" of water to be used for 8 recreational release weekends during the summer, 3 in July, 3 in August, 2 in September. The scheduled Pemi release would fill in the extra day in July and August. June usually has good water most years anyway so we did not waste our request weekends for that month. The 3-1/2" of water does not need to be stored from the outset, it could be "time shifted" from normal summer precipitation events.
The
Section 1
Approximately 2 miles
Class I and II rapids (easy)
This section of river is one of the very best training and novice white water rivers in the region. This section is accessed from a public boat launch on
The paddling community is very concerned about talk and preliminary plans about the Army Corps of Engineers recommendation to dredge the upper portions of this run. This would eliminate the warm up rapids and destroy one of the best training rivers in all of central
Section 2
Clement Dam in Tilton to
Approximately 2.25 miles
Class I and quickwater (very easy)
This section of river does not currently draw many paddlers. The primary reason is the difficult access caused by the Clement Dam boundary fences. It is nearly impossible to put in without trespassing or climbing fencing.
This section is very scenic as it is mostly isolated from homes and development. It would be of more interest to fishermen, birdwatchers, and touring boats. There is a short rapids section shortly below the dam and one more class I rapid about half way through. Wildlife is very prevalent here with deer, herons, hawks, mink, and other wildlife seen on just one recent trip. Takeout on river left just above the
Section 3
Approximately 1.25 miles
Class III (IV high water) (intermediate to difficult)
The
Takeout is at the newly built
Section 4
Approximately 1/2 mile
Impassable by boat
This section of river is populated by several dams and associated buildings that totally block downstream access to paddlers. Access to the upper Merrimack River is gained by a public boat launch on the
Current Recreational Status
Better management of water levels and releases could significantly improve conditions for recreational paddling on the
A guaranteed 800 cfs minimum release level on scheduled summer weekends would draw hundreds of boaters. We would like to request three scheduled release weekends in July and August and two scheduled release weekends in September.
A scheduled Winnipesaukee release would fill a huge gap in central New England with novice and intermediate paddling opportunities only 75 miles and 1-1/4 hours from the
Economic Reasoning
The downstream recreational enhancement program will be an economic plus for the tourist bypass towns downstream of the lakes. This region which includes the west end of Tilton,
Recreational Balance
Currently, power-boating and power-boating related activities are the main focus of all recreational activities on the lakes. In recent years the lake has become more crowded and overwhelmed with larger high speed craft. Human powered craft (canoes and kayaks) are endangering themselves whenever they enter the waters of lake Winnipesaukee, Opechee, Winnisquam, Wentworth, or other associated lakes and bays. American Whitewater is asking for a balanced recreational opportunity for a segment of the society that would prefer a healthier and an environmentally friendlier activity within the region.
Downstream Environmental
The current status is detrimental to the rivers ecological balance. The 250cfs continuous flow through the summer does not allow eddies and pools to “flush out”. These areas then become increasingly stagnant with flotsam and microbial growth. A natural (or manmade) cycle would see the river rise and fall several times over the course of the summer from rain events and drought. This fluctuation of flow also pulls in bugs and other nutrients from the immediate shoreline helping to feed the native fish stocks within the river. Although we do not profess the recreational releases to exactly mimic the natural cycle, it will be better than a continuous 250 cfs flow for months on end.
Our request asks for 1 continuous release each weekend spanning 38 hours instead of two separate release events over the course of the weekend. Although this plan will use more water than two separate releases, environmentally one release cycle running through the weekend is less stressful to downstream biota. In addition Lochmere dam is located at the head of
Recent History
For more than 20 years local paddling organizations along with the “Friends of the
The main cleanup efforts in the early years were to remove rebar and log cribbing from those dams. Recent years efforts have concentrated on trash removal. Everything from snowmobiles, waterheaters, car parts, oil tanks, lake docks, air conditioners, tires, bicycles etc. have been removed over the last two decades. This effort over the years has really improved this river segment from "something to avoid at all cost" to one of the most popular late spring / early summer runs in the state of NH. As a result of these efforts the towns of
The Winnipesaukee River Trail was also dedicated two years ago. This Trail runs along the south bank of the
In Tilton the town dedicated a new riverside park at the take out for the class I-II upper Winnipesukee this past September. This park also features a boat ramp, parking and bathrooms.
Request
What our organizations are requesting is for a lake management plan that would hold back and reserve 3-1/2” of lake water to be used for summer weekend downstream recreational releases. This 3-1/2” could be stored early in the season and/or “time shifted[1]” with normal precipitation accumulations during the three month period.
We are requesting a total of 8 recreational release weekends possibly adhering to the following schedule:
July
1st full weekend Recreational release 800cfs
2nd full weekend Recreational release 800cfs
3rd full weekend Base flow 250cfs
4th full weekend Recreational release 800cfs
5th full weekend* Base flow 250cfs
August
1st full weekend Recreational release 800cfs
2nd full weekend Recreational release 800cfs
3rd full weekend Base flow 250cfs
4th full weekend Recreational release 800cfs
5th full weekend* Base flow 250cfs
September
1st full weekend Recreational release 800cfs
2nd full weekend Recreational release 800cfs
3rd full weekend Base flow 250cfs
4th full weekend Base flow 250cfs
5th full weekend* Base flow 250cfs
* If applicable
Each weekend release is equivalent to 7/16” of water off the lake.
We also request NHDES to make arrangements for dam operations at Lochmere and Lakeport to provide these releases starting at 10 pm on Fridays and ending at 12 pm on Sundays.
We also request test flows for the summer of 2007 to verify this plan. We ask that the final plan be implemented for the summer of 2008.
The table[2] below shows the anticipated lake level drop in inches for various flow models for an entire season. The table is based on the surface area of
|
Weeks |
Total Hours |
250 cfs |
500 cfs |
750 cfs |
800 cfs |
900 cfs |
1000 cfs |
|
|
14 |
532 |
0 |
2.88 |
5.77 |
6.35 |
7.50 |
8.65 |
|
|
13 |
494 |
0 |
2.68 |
5.36 |
5.89 |
6.96 |
8.03 |
|
|
12 |
456 |
0 |
2.47 |
4.94 |
5.44 |
6.43 |
7.42 |
|
|
11 |
418 |
0 |
2.27 |
4.53 |
4.99 |
5.89 |
6.80 |
|
|
10 |
380 |
0 |
2.06 |
4.12 |
4.53 |
5.36 |
6.18 |
|
|
9 |
342 |
0 |
1.85 |
3.71 |
4.08 |
4.82 |
5.56 |
|
|
8 |
304 |
0 |
1.65 |
3.30 |
3.63 |
4.29 |
4.94 |
The following table adds two large lakes to the formula. The surface areas of Wentworth and Winnisquam lakes would add an additional 10 square miles to the flow model. The table below shows the anticipated lake level drop in inches for various flow models for an entire season. The table is based on the surface area of
|
Weeks |
Total Hours |
250 cfs |
500 cfs |
750 cfs |
800 cfs |
900 cfs |
1000 cfs |
|
|
14 |
532 |
0 |
2.53 |
5.07 |
5.57 |
6.58 |
7.60 |
|
|
13 |
494 |
0 |
2.35 |
4.70 |
5.17 |
6.11 |
7.05 |
|
|
12 |
456 |
0 |
2.17 |
4.34 |
4.78 |
5.64 |
6.51 |
|
|
11 |
418 |
0 |
1.99 |
3.98 |
4.38 |
5.17 |
5.97 |
|
|
10 |
380 |
0 |
1.81 |
3.62 |
3.98 |
4.70 |
5.43 |
|
|
9 |
342 |
0 |
1.63 |
3.26 |
3.58 |
4.23 |
4.88 |
|
|
8 |
304 |
0 |
1.45 |
2.89 |
3.18 |
3.76 |
4.34 |
We hope the New Hampshire Department of Environmental Services and the state of
[1] Time shifting- holding back runoff from a precipitation event to coincide with the next scheduled release weekend.
[2] The tables show the total lake elevation drop in inches for an entire season over and above the base flow of 250 cfs (yellow area). The left column (green) contains scenarios for a number of weeks. The second green column is a multiple of the weekend 38 hour release request times the number of weeks in the leftmost column. The upper row (blue) contains various release scenarios in cubic feet per second (cfs)
The