Foothills and Valleys Ecoregion Key

1 1st - 2nd order or <15 miles long Go To 2 Below
1 3rd - 4th order or 15 - 60 miles long Mountain Stream
1 5th order or >60 river miles and a direct tributary of the Intermountain Transitional River Small Transitional Foothills River
2 1st or 2nd order, elevation >2400m, hydrology driven by alpine snowmelt Alpine Stream
2 1st order, elevation from 1500 to 2400m, hydrology fed by ground water discharge Mountain Spring

Ecoregions are based on Omernik’s Level III Ecoregion delineations (see Woods, A.J. et al. 2002. Ecoregions of Montana. 2nd edition poster).The Northwestern Great Plains are the Northwestern Great Plains Level III Ecoregion (#43).

Other Links