Abstract:                                                                       

This coverage is a record of subbasins (4th field hucs) in Montana where native Grayling
are known to be currently distributed or have been historically distributed.  This information 
was developed by fisheries personnel at MFWP (Montana Fish Wildlife and Parks) from information
from the Nature Conservancy and MFWP fish distribution data.  It was then compiled into this GIS
coverage by StreamNet staff:

Steve Carson, MFWP (stcarson@st.mt.us)
Regional StreamNet GIS Specialist, PSMFC (StreamNetGIS@psmfc.org)

Purpose:
                                                                        
Data is intended for use in a variety of applications where historic and current fish distribution
is important.                                        
                                                                                
Limitations_of_Data:                                                            

Some data is historical in nature and thus cannot be currently verified in the field but is
instead based on historical records.  Distribution is resolved only to the 4th field huc (subbasin) 
level where distribution shown in a 4th field huc indicates that Grayling were distributed historically 
within at least part of this area  but not necessarily over this entire area.
                                                                                
Entity_and_Attribute_Overview:                                                  

Attribute	Type			Definition                                                          

AREA		Binary Fl.point		Area of polygon in coverage units
PERIMETER	Binary Fl.point		Perimeter of polygon in coverage units
GRAYLHIST#	Binary Integer		Internal feature number
GRAYLHIST_ID	Binary Integer		User-assigned feature number
HUC		Binary Integer		PNW Reach files 4th field HUC (Hydrologic Unit Code)
NAME		Character		Name of PNW Reach Files HUC (ie. subbasin)
ELCODE		Character		The Nature Conservancy (TNC) species tracking code
SPECIES		Character		Species Scientific Name
COMMON_NAM	Character		Species Common Name
GRANK		Character		TNC Global Conservation Status Rank-
					GX = Species Presumed Extinct (Believed to be extinct throughout its range. Not located despite intensive searches of historical sites and other appropriate habitat, and virtually no likelihood that it will be rediscovered. Ecological communities eliminated throughout its range, with no restoration potential due to extinction of dominant or characteristic species.)
     					GH = Species Possibly Extinct (Known from only historical occurrences, but may nevertheless still be extant; further searching needed.  Ecological communities presumed eliminated throughout its range, with no or virtually no likelihood that it will be rediscovered, but with the potential for restoration (e.g., American Chestnut Forest).)
     					G1 = Critically Imperiled (Critically imperiled globally because of extreme rarity or because of some factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) or acres (<2,000) or linear miles (<10).)
     					G2 = Imperiled (Imperiled globally because of rarity or because of some factor(s) making it very vulnerable to extinction or elimination. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) or acres (2,000 to 10,000) or linear miles (10 to 50).)
     					G3 = Vulnerable (Vulnerable globally either because very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extinction or elimination. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals.)
     					G4 = Apparently Secure (Uncommon but not rare (although it may be rare in parts of its range, particularly on the periphery), and usually widespread. Apparently not vulnerable in most of its range, but possibly cause for long-term concern. Typically more than 100 occurrences and more than 10,000 individuals.)
GRANKDATE	Character		Date GRANK assigned.
STATUS		Character		Occurrence status: "H" denotes historical presence, "C" denotes current presence
STATE		Character		U.S State (All values "MT")
SOURCE		Character		Source literature or expert reviewer
SOURCE_COD	Character		Source Code (relates to full citation fo published or unpublished source, agency, and/or expert reviewer).
COMMENTS	Character		Indicates whether species is native or introduced.

Procedures_Used:                                                                

Data was collected by huc from various sources (see abstract) and then matched with a hydrologic coverage of hucs to
create a GIS coverage.
                                                                                
Revisions:                                                                      

N/A                    
                                                                                
Reviews_Applied_to_Data:                                                        

N/A
                                                                                
Related_Spatial_and_Tabular_Data_Sets:

N/A

References_Cited:                                                               

See Source, Source_Cod Attributes in file.                                                             
                                                                                
Notes:                                                                          

N/A
                                                                                
Currentness_Reference:                                                          

Data is current as of 2000.                                                              
                                                                                
Maintenance_and_Update_Frequency:                                               

No additional updates or maintenance are currently planned.

Access_Constraints:                                                             

N/A                                            
                                                                                
Data_Set_Credit: 

Data was generated by The Nature Conservancy (http://www.tnc.org) and compiled by the StreamNet project (http://www.streamnet.org)                                                                                                         
                                                                                
Completeness_Report:                                                            

Complete data set.  See "Limitations of Data" for limitations.                    
                                                                                
Horizontal_Positional_Accuracy_Report:                                          

Not Available
                                                                                
Vertical_Positional_Accuracy_Report:                                            

Not Available
                                                                                
Cloud_Cover:                                                                    

N/A                           


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