Dam Name : Blackwater Dam
NPDP ID : NH00001

NPDP IDNH00001
Dam NameBlackwater Dam
Other Dam NameDry Reservoir
Year of Completion1941
State ID01720
Is in NIDYes
Is in OperationYes
Longitude-71.72
Latitude43.31
StateNH
CountyMerrimack
Town Section 
RiverBlackwater River
Owner NameCenae
Owner TypeFederal
Dam TypesEarth Gravity
NID CoreCore; Earth; Known;
Crest Length1150
Dam NID Height69
Structral Height69
Hydraulic Height64
Dam Volume299000
NID TypeRock & Soil
Max Storage Capacity93400
Normal Storage Capacity1
NID Storage Capacity93400
Surface Area1
Drainage Area128
Primary PurposeFlood Control and Storm Water Management
Secondary PurposeNone
Hazard ClassificationHigh
EAPYes
Is State RegulatedNo
State Regulatory AgencyNEW HAMPSHIRE WRD
Federal Regulatory AgencyCE