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  • Description
    unique identification number assigned to each dam in the Dams Directory. The NPDP ID is equivalent to the U.S. National Inventory of Dams ID(NATDAM ID). For dams that pre-date the National Inventory of Dams(i.e., failed or were retired prior to the initial inventory was formed) or are not included in the current inventory(i.e., do not satisfy the NID size criteria), the NPDP staff assigns an identificaiton number. 
  • Format
    AAnnnn     : AA - State abbreviation, nnnn - index number. For NPDP assigned IDs, the format is AASnnnn.
    • ',CAPTION,"NPDP Help: NPDP ID", WIDTH,0.25*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE"); break case "NPDP_ID1": return overlib('',CAPTION,"NPDP Help: NPDP ID", WIDTH,0.25*screen.availWidth, OFFSETY, -200, STICKY, CLOSECOLOR, "#EEEEEE"); break case "NPDP_ID2": return overlib('',CAPTION,"NPDP Help: NPDP ID", WIDTH,0.25*screen.availWidth, OFFSETY, 70, STICKY, CLOSECOLOR, "#EEEEEE"); break case "NPDP_ID3": return overlib('',CAPTION,"NPDP Help: NPDP ID", WIDTH,0.25*screen.availWidth, OFFSETX, 430, STICKY, CLOSECOLOR, "#EEEEEE"); break case "DAM_NAME": return overlib('The official name of the dam. For dams that do not have an official name the popular name is used.',CAPTION,"NPDP Help: Dam Name", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE"); break case "DAM_NAME1": return overlib('The official name of the dam. For dams that do not have an official name the popular name is used.',CAPTION,"NPDP Help: Dam Name", WIDTH,0.22*screen.availWidth, OFFSETY, -50, STICKY, CLOSECOLOR, "#EEEEEE"); break case "DAM_NAME2": return overlib('The official name of the dam. For dams that do not have an official name the popular name is used.',CAPTION,"NPDP Help: Dam Name", WIDTH,0.22*screen.availWidth, OFFSETY, 50, STICKY, CLOSECOLOR, "#EEEEEE"); break case "OWNER_NAME": return overlib('The name of the owner of the dam.', CAPTION,"NPDP Help: Owner Name", WIDTH,0.18*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "OWNER_TYPE": overlib('The type of owner could be one the following:',CAPTION,"NPDP Help: Owner Type", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "STATE": overlib('The abbreviation for the state in which the dam is located.',CAPTION,"NPDP Help: State", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "STATE1": overlib('The state in which the dam is located.',CAPTION,"NPDP Help: State", WIDTH,0.22*screen.availWidth, OFFSETY, 50, STICKY, CLOSECOLOR, "#EEEEEE") break case "INCIDENT_YEAR": overlib('The year that incident occur in.',CAPTION,"NPDP Help: Incident Year", WIDTH,0.22*screen.availWidth, OFFSETY, 50, STICKY, CLOSECOLOR, "#EEEEEE") break case "INCIDENT_YEAR1": overlib('The year that incident occur in.',CAPTION,"NPDP Help: Incident Year", WIDTH,0.22*screen.availWidth, OFFSETY, 20, STICKY, CLOSECOLOR, "#EEEEEE") break case "INCIDENT_YEAR2": overlib('The year that incident occur in.',CAPTION,"NPDP Help: State", WIDTH,0.22*screen.availWidth, OFFSETY, -50, STICKY, CLOSECOLOR, "#EEEEEE") break case "STATE_ID1": overlib('Specific State or Agency unique dam identification number.',CAPTION,"NPDP Help: State", WIDTH,0.22*screen.availWidth, OFFSETY, -50, STICKY, CLOSECOLOR, "#EEEEEE") break case "FAILURE1": overlib('Failure - Breach and uncontrolled release of the reservoir.',CAPTION,"NPDP Help: Dam Failure", WIDTH,0.22*screen.availWidth, OFFSETY, 100, STICKY, CLOSECOLOR, "#EEEEEE") break case "INCIDENT_TYPE1": overlib('Type of the incident.',CAPTION,"NPDP Help: Incident type", WIDTH,0.22*screen.availWidth, OFFSETY, 120, STICKY, CLOSECOLOR, "#EEEEEE") break case "ABOUT_NPDP": return overlib('

    The NPDP Dams Directory is a comprehensive database of dams in the U.S.  It includes:

    Unlike the NID, which maintains data on dams currently in operation, the NPDP Dams Directory retains all dams historic, currently operating, and recently removed or retired.

    Features of the Dams Directory are:

    ', CAPTION,"NPDP Help: About NPDP Dam Directory", WIDTH, 0.33*screen.availWidth, FIXX, 5, OFFSETY, -45, STICKY, CLOSECOLOR, "#EEEEEE") break case "NID": return overlib('The NID is a database maintained by the U.S. Army Corps of Engineers. It is periodically updated with data provided by the states and federal agencies. The NID includes dams currently in operation that meet the following criteria:
    Parameter Criteria
    Dam Height(feet) >= 25
    Reservoir Volume(acre feet) >= 50
    Hazard Class High hazard, any size
    ', CAPTION,"NPDP Help: U.S. National Inventory of Dams (NID)", WIDTH,0.42*screen.availWidth, OFFSETY, -20, STICKY, CLOSECOLOR, "#EEEEEE") break case "InOperation": return overlib('Selecting this option searches all, currently operational dams, irrespective of dam size, and whether the dam is regulated or not.', CAPTION,"NPDP Help: Dams In Operation", WIDTH,0.30*screen.availWidth, OFFSETY, -20, STICKY, CLOSECOLOR, "#EEEEEE") break case "DAM_TYPE": return overlib('The type of the dam could be one or more of the following, in order of importance:
    • Earth
    • Rockfill
    • Gravity
    • Buttress
    • Arch
    • Multi-Arch
    • Concrete
    • Masonry
    • Stone
    • Timber Crib
    • Other
    ', CAPTION,"NPDP Help: Dam Type", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "CORE": return overlib('The position, type of watertight member and certainty:
        Position:
    • Upstream Facing
    • Homogenous Dam
    • Core
    • Unlisted/unknown

        Type:
    • Bituminous Concrete
    • Concrete
    • Earth
    • Metal
    • Plastic
    • Unlisted/unknown

        Certainty:
    • Known
    • Estimated
    ', CAPTION,"NPDP Help: Core", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "DAM_HEIGHT": return overlib('The height of the dam in feet to the nearest foot. It is defined as the vertical distance between the lowest point on the crest of the dam and the lowest point in the original streambed.', CAPTION,"NPDP Help: Dam Height", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "NORMAL_STORAGE": return overlib('The normal storage in acre-feet. It is defined as the total storage space in a reservoir below the normal retention level, including dead and inactive storage and excluding and flood control or surcharge storage.', CAPTION,"NPDP Help: Dam Storage", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "LONGITUDE": return overlib('The longitude at the dam centerline as a single value in decimal degrees (e.g., -140.15).', CAPTION,"NPDP Help: Longitude", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "LATITUDE": return overlib('The latitude at the dam centerline as a single value in decimal degrees (e.g., 49.75).', CAPTION,"NPDP Help: Latitude", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "RADIUS": return overlib('A user specified distance from a center location (longitude/latitude) for purposes of conducting a radial search. Only dams located within this radius are displayed.',CAPTION,"NPDP Help: Radius", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "COUNTY": return overlib('The name of the county in which the dam is located.', CAPTION,"NPDP Help: County", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "COUNTY1": return overlib('The name of the county in which the dam is located.', CAPTION,"NPDP Help: County", WIDTH,0.22*screen.availWidth, OFFSETY, 50, STICKY, CLOSECOLOR, "#EEEEEE") break case "RIVER": return overlib('

    The river or stream designation may be entered in one of two ways. For the convenience of some organizations, an alternative field entry is provided which is consistent with the "tributary and offstream" designations used in the 1995-96 NID. If the alternative form is used, TEC will convert it to the standard form prior to inclusion in the national inventory.

    River or Stream Standard Entry: The official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributary to a named river. e.g., Snake-TR. If the river or stream is located offstream, the name will be the name of the river or stream plus "-OS", e.g., Snake-OS.

    River or Stream Alternative Entry: The official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributary to a named river, e.g., TR-Snake. If the dam is located offstram, the name will be the name of the river or stream plus the word, "OFFSTREAM," e.t., Snake OFFSTREAM.

    ', CAPTION,"NPDP Help: River or Stream", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "RIVER1": return overlib('

    The river or stream designation may be entered in one of two ways. For the convenience of some organizations, an alternative field entry is provided which is consistent with the "tributary and offstream" designations used in the 1995-96 NID. If the alternative form is used, TEC will convert it to the standard form prior to inclusion in the national inventory.

    River or Stream Standard Entry: The official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributary to a named river. e.g., Snake-TR. If the river or stream is located offstream, the name will be the name of the river or stream plus "-OS", e.g., Snake-OS.

    River or Stream Alternative Entry: The official name of the river or stream on which the dam is built. If the stream is unnamed, identify it as a tributary to a named river, e.g., TR-Snake. If the dam is located offstram, the name will be the name of the river or stream plus the word, "OFFSTREAM," e.t., Snake OFFSTREAM.

    ', CAPTION,"NPDP Help: River or Stream", WIDTH,0.22*screen.availWidth, OFFSETY, 50, STICKY, CLOSECOLOR, "#EEEEEE") break case "INKM": return overlib('Select the units (kilometers or miles) for the radial distance.', CAPTION,"NPDP Help: By (Kilometers or Miles)", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "PURPOSE": return overlib('The purpose(s) of the reservoir could be one or more of the following:
    • Irrigation
    • Hydroelectric
    • Flood Control and Storm Water Management
    • Navigation
    • Water Supply
    • Recreation
    • Fir Protection, Stock, Or Small Farm Pond
    • Fish and Wildlife Pond
    • Debris Control
    • Tailings
    • Other
    ', CAPTION,"NPDP Help: Purpose", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") break case "HAZARD_CLASS": return overlib('The potential hazard to the downstream area resulting from failure or misoperation of the dam or facilities:

    • Low
    • Significant
    • High

    Definitions, as accepted by the Interagency Committee on Dam Safety, are as follows:

    Low Hazard Potential: Dams assigned the low hazard potential classification are those where failure of misoperation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner\'s property.

    Significant Hazard Potential: Dams assigned the significant hazard potential classification are those dams where failure or misoperation results in no probable loss of human life, but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be located in areas with population and significant infrastructure.

    High Hazard Potential: Dams assigned the high hazard potential classification are those where failure or misoperation will probably cause loss of human life.


    ', CAPTION,"NPDP Help: Hazard Classification", WIDTH,0.22*screen.availWidth, LEFT, STICKY, CLOSECOLOR, "#EEEEEE") } }