Middle Rockies & Isolated Mountain Ranges Ecoregion Key
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1 
1st - 2nd order or <15 miles long
  
1 
3rd - 4th order or 15 - 60 miles long
  
1 
5th order or >60 river miles and a direct tributary of the Intermountain Transitional River
 
 
2 
1st or 2nd order, elevation >2400m, hydrology driven by alpine snowmelt
  
2 
1st order, elevation from 1500 to 2400m, hydrology fed by ground water discharge
 

Ecoregions are based on Omernik’s Level III Ecoregion delineations (see Woods, A.J. et al. 2002. Ecoregions of Montana. 2nd edition poster). The Middle Rockies Mountain Ecoregion is the mid to high elevation Middle Rockies Mountain ranges (#17).
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