WCT Multi-state Assessment February 10, 2003 



WCT ASSESSMENT FLOW CHART 



The assessment will be completed using ten sub-area workshops to convene teams of knowledgeable 

 individuals to complete a standard set of forms and to make specific notations on historical and current 

 distribution maps. Each sub-area is composed of several 4* level HUC's associated with a specific portion of 

 the WCT historical distribution area. The infomiation collected at the workshops will be entered into a GIS 

 referenced database for subsequent analysis and display. 



PART 1 - HISTORICAL DISTRIBUTION INFORMATION 



This component of the status assessment relates to the historical distribution of WCT referenced to the time of 

 first European exploration and occupation of the Northern Rocky Mountains (circa 1800). The initial 

 assumption is that the entire hydrography layer would have been occupied unless barriers and/or habitat 

 limitation would have precluded occupation. An important consideration is the occurrence of barriers that 

 would have influenced historical distribution. 



Step 1 : Refer to 4 HUD map and designate map as Historical. 



Step 2: Identify all barriers that would have influenced historical distributions. 



These would primarily be geologic features (e.g. falls) but could be 



otherwise (e.g. thermal barriers). Mark barrier location and number each barrier 



within a box ( i.e. ) in numerical sequence. 



Step 3: Fill out a barrier form for each barrier. 

 Step 4: Develop a color legion on the map to signify rationale for excluding stream 



sections or including stream sections (i.e. E-1, E-2, 1-l or 1-2). Use green for E-1. 



Orange for E-2. Yellow for I-l. Brown for 1-2. 

 Step 5: With the appropriate color marker identify on the map stream segments to be 



Excluded or included. 

 Step: 6 Fill out a historical distribution form corresponding to rationale for excluding 



or including stream sections. 

 Step: 7 Transfer the forms and maps to data entry person. NOTE: If sufficient team 

 members are available it would be have one team member assist the data entry 

 person. 



PART 2 - CURRENT DISTRIBUTION INFORMATION 



This component of the status assessment provides information on current distribution of all WCT. In this part 

 of the assessment, the upper and lower bounds of all stream segments presently occupied by naturally self- 

 sustaining WCT will be located on the current distribution map with a colored marker. Important Note; This 

 part of the assessment proceeds specific identification of actual populations. At this point we are only 

 identifying where WCT occur within stream segments of each 4"* level HUC. Highlight all stream 

 segments currently occupied by WCT. A stream can be defined as a single mapping segment or can be 

 subdivided into several mapping segments (e.g. above and below a barrier; above and below a tributary of 

 significance; or, based on presence or absence of non-native fish; etc.). Mapping segments (units) cannot 

 include multiple streams. 



Step 1 : Refer to 4 HUD map and designate map as Current. 



Step 2. Identify all barriers that are believed to have a substantial influence on current 



Page - 66 



