WARREN LAKE DAM (5.04), ALSTEAD, NEW HAMPSHIRE
OPERATION & MAINTENANCE PLAN
(DRAFT, supply information as necessary as indicated in red type)
Seasonal Operation
 During the summer season the pond elevation is maintained at the crest of the concrete overflow
spillway. The stoplogs will also be maintained at the crest of the concrete overflow spillway
during the summer season.
 Due to limiting effect of 24-inch culvert that is immediately downstream of the stoplog bay, no
specific operations of the stoplogs will be conducted in the fall or in the spring to either lower or
raise the impoundment. However, during low flow conditions the stoplogs will be adjusted in
conjunction with falling and rising elevation of the water surface to maintain minimum flows
downstream.
Emergency Operation
 It has been calculated that removal of the stoplogs will have little to no influence with regard to
major storm events, thus no specific operations will be conducted prior to a storm event.
Maintenance Program
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Weekly
Both the overflow concrete spillway and the stoplog bay are checked and cleared of debris.
A brief inspection of the dam is conducted to look for significant differential movement of the
right concrete cap, movement of stone along the downstream face both north and south, seepage at
the toe of the downstream stonewall, and signs of settlement within the earthen embankment.
Semi Annually
The earth embankments will be mowed at least twice a year to prevent the growth of undesirable
vegetation.
Vines, plants, and woody/tree growth will be removed from the downstream stone face, within 10
feet of the downstream toe of the dam and within 15 feet of the right and left abutment to facilitate
inspection of these areas and to eliminate the damage caused by tree growth.
The downstream channel and culvert will be checked for debris and plant growth. The debris and
plant growth will promptly be removed to maintain a free flowing condition between the
downstream culvert and the dam.
Annually
Conduct a full visual inspection and repair any significant items noted upon full inspection,
including but not limited to sealing cracks in the right concrete cap, replacing deteriorated wooden
stoplogs, repairing settlement/erosion within the earthen embankment with suitable embankment
material and specifically checking for seepage at the toe of the downstream stone retaining wall.
Test and update the Emergency Action Plan as necessary.
Emergency Contact Person(s)
Supply a list of emergency contact personnel (it could be just one person to get the ball rolling).
This should include the name and telephone number of key personnel and should be up-to-date.
Dam Monitor(s)
The dam monitor will be a qualified/trained individual(s) designated to perform and uphold the
maintenance program as indicated above.
(Dam monitor name telephone number and address)