Dam Facilities

Abstract:                                                                       

This coverage is a spatial representation of most of the Pacific Northwest dam facilities in the
StreamNet database.  Information about the location of each dam facility was collected from StreamNet
personnel at WDFW (Washington Dept of Fish & Wildlife), ODFW (Oregon Dept of Fish & Wildlife), IDFG
(Idaho Dept of Fish & Game), and MFWP (Montana Fish, Wildlife & Parks) and the tabular information
about each hatchery in the StreamNet database was then added to each dam facility point in the GIS coverage.
Original information for most facilities was derived from the National Inventory of Dams and then revised and
amended when better information could be found by the StreamNet data compilers.

For more information about this coverage, please contact: 

Regional StreamNet GIS Specialist (StreamNetGIS@psmfc.org)

Purpose:
                                                                        
Data is intended for use in a variety of applications where location of and information about
dams is important.                                       
                                                                                
Limitations_of_Data:                                                            

Dam facility locations were determined from longitude/latitude coordinate or 1:100,000 scale stream
based information submitted by StreamNet personnel at the state agencies.  Longitude and latitude
coordinates were generally determined to 4 decimal places  (ie. long 123.5763, lat 44.2345) but
may be less precise for some hatcheries.  Wherever possible, dams were linked to 1:100,000 scale
streams via the LLID routing system, so that they would plot out directly on the stream.  The event
table data format only includes the data records that are linked to this stream routing system.  Information
on more dam facilites were provided by some state data compilers than others, so this coverage should
not be used for cross-state comparisons of the number of dam facilities.
                                                                                
Entity_and_Attribute_Overview:                                                  

Attribute	Type			Definition                                                          

AREA		Binary Fl.Point		Internal field- Not applicable to this data set
PERIMETER	Binary Fl.Point		Internal field- Not applicable to this data set
DAMS#    	Integer       		Internal feature number for each point
DAMS-ID  	Integer      		User-assigned feature number for each point
DAMNAME		Character		The name of the dam facility
STATE		Character		The state where the dam facility is located
FISHWAY		Character		Description of fish passage facilities
FISHWAYTYP	Character		Description of type of fishway
OWNER		Character		The owner of the dam
OWNERTYPE	Character		The institutional status of the dam owner
YEARINIT	Binary			The year that construction of the dam began
YEARCOMPL	Binary			The year that the dam was completed
YEARREMOVE	Binary			The year that the dam was removed (if applicable)
DAMLENGTH	Binary Fl.Point		Dam crest length, in feet
NIDHEIGHT	Binary Fl.Point		The maximum of dam, structure, or hydraulic height, in feet, according to the National Inventory of Dams
SNETHEIGHT	Binary Fl.Point		The height of the dam, in feet, from a source other than the National Inventory of Dams
NORMSTORAGE	Binary Fl.Point		The normal storage capacity of the reservoir in acre feet
MAXSTORAGE	Binary Fl.Point		The maximum storage capacity of the reservoir in acre feet
REFID		Binary Fl.Point		The primary reference number describing the source of the dam information.  For a corresponding table of references, see ftp://ftp.streamnet.org/pub/streamnet/ASCII_Data/Reference.txt
NID#		Character		The National Inventory of Dams ID number
FERCSITEID	Character		The Federal Energy Regulatory Commission Site Locatin Code
LLID		Character		The unique stream identifier for the 1:100,000 scale stream that the dam is located on.
STRMNAME	Character		The name of the stream that the dam is on.
BEGFT		Integer			The coordinate on the LLID routing system that the dam is at (event table only)
DAMID		Binary Fl.Point		Unique StreamNet identifier for the dam
MAJOR		Character		Is this a major dam? (Y=yes, N=no).  This attribute was determined by examining the height, width, storage capacity, and FERC information on energy production for the facility, and is subjective.




Procedures_Used:                                                                

Generated a geographic coverage with the longitude/latitude coordinates for each facility based on location information
from the StreamNet hatchery facility database.  Dam facilities that did not have longitude/latitude or stream-based locations
were not included.  Projected the coverage to the StreamNet lambert projection and added additional data fields to the point
attribute table.  Imported the StreamNet dams information table, related it to the point attribute table by StreamNet
Dam ID, and populated the additional information to the point attribute table.
                                                                                
Revisions:                                                                      

This is the first version of this data file (created June 2002).  Further updates will be made if/when new facility information
is submitted by the state data compilers.

Reviews_Applied_to_Data:                                                        

Visual Q/A.
                                                                                
Related_Spatial_and_Tabular_Data_Sets:

The StreamNet Dam Table - Available for download at http://www.streamnet.org/online-data/asciitables.html
                                                                            
Currentness_Reference:                                                          

Data is current as of year 2002.                                                              
                                                                                
Access_Constraints:                                                             

None                                            
                                                                                
Data_Set_Credit: 

Data was compiled by the StreamNet project (http://www.streamnet.org).  Data was provided by
Washington Dept. of Fish & Wildlife, Oregon Dept. of Fish & Wildlife, Idaho Dept. of Fish & Game, and Montana Dept. of Fish, Wildlife & Parks,
Much of the original data was collected from the National Inventory of Dams.                                                                                                        
                                                                                
Completeness_Report:                                                            

Complete data set.  See "Limitations of Data" for limitations.                    
                                                                                
GIS Data Projection Info:

PROJECTION LAMBERT 
UNITS FEET 
DATUM NAD27 
SPHEROID CLARKE1866 

1st Standard Parallel 42 20 0.000 
2nd Standard Parallel 48 40 00 
central meridian -117 00 0.00 
lat org 41 00 0.00 
easting 914401.82880 (in meters) 
northing 0.0                            
