! O FLATHEAD SANDERS LINCOLN 170102130201 1 7 0 1 0 2 13 0 2 0 2 1 7 0 1 0 2 1 2 0 20 3 1 7 0 1 0 2 1 3 10 0 3 170102120201 170102130402 170102130803 170102130801 170102130802 170102131004 170102120103 170102130104 170102130105 170102120104 170101020201 1 7 0 1 0 2 1 3 1 3 0 2 170102131006 170101020202 170102131005 170101020106 170101020107 170102080203 170102120102 170102130101 170102131303 170102130102 170102131301 170101020401 170101020108 170102080205 170102131104 170101020402 170101020104 170102080202 170101020101 170101020403 170102120101 170102131103 170101020105 170101020103 170101020404 170101020405 170102080201 170101010801 170101010802 1 7 0 1 0 2 1 3 1 1 0 2 170101020102 170102100302 1 7 0 1 0 2 1 0 0 3 0 1 1 7 0 1 0 2 0 8 0 2 0 7 170102131101 170101020306 170101020304 170101010803 1 7 0 1 0 2 1 0 0 4 0 2 170102100304 170102100305 170101020406 170101010804 170101020305 170102100303 170101011103 170101010805 170101011001 170102100306 170101010709 170101011002 170102100202 170101020303 1 70 1 0 2 1 0 0 3 0 8 170101010707 170102100307 170101010711 170101011105 170102100203 170101020301 170101010705 170101020302 170102100201 170101011005 170101010710 170101010703 170101010706 170102100204 170101010903 170102100106 1 7 0 10 1 0 1 0 70 4 170101010701 170102100107 170101010708 170101011003 170101010202 170101011207 170101011004 170102100102 170101011201 LOWER FLATHEAD STILLWATER OF THE FLATHEAD LOWER CLARK FORK FISHER UPPER KOOTENAI Koot en a i Ri ver ¬ « 37 B ig Ch erry C reek W o lf C re ek ¬ « 56 ¬ « 200 V er mi l i on R ive r B ull Rive r P i p e C r e ek P l e as a n t Va lley F is h er Ri ve r L i b b y C r e e k F i s h e r R i v e r ¬ « 56 G o od C re e k Lo gan Creek F i s h t r a p C r e e k A sh l e y C r e e k Fo r t i ne Cr eek £ ¤ 2 T h o m p s o n R i v e r S il ve r Bu t t e F i s h er R iv e r L a k e C r e e k L it t l e B i t t e r r o o t R iv e r 1701021202 1701021201 1701021302 1701021308 1701021310 1701010202 1701021301 1701021313 1701010201 1701021311 1701010204 1701020802 1701010108 1701021003 1701010111 1701021002 1701010203 1701010107 1701010110 1701010112 1701010109 1701021001 Noxon Marion Libby Legend Lake - Reservoir Perennial River Intermittent Stream Sub Watershed (Sixth Code) County Watershed (Fifth Code) Sub Basin (Fourth Code) ¹ 1:300,000 Map Scale: Sub Basin within Montana Basins FISHER 17010102 HUC Basin - A basin is a large-scale watershed, such as for the Montana, Missouri, Yellowstone and Clark Fork rivers. These are also referred to by a U.S. Geological Survey coding scheme called Hydrologic Unit Codes (HUCs). Each of these basins has a six-digit code called HUC6 watersheds. HUC6 watersheds cover an average of 2,525 square miles. Watersheds with more digits are smaller. Subbasin - Subbasins are smaller scale basins, such as the Clark Fork Yellowstone River, Middle Fork Flathead River, Gallatin River, Lower Musselshell River or Little Bighorn River. These watersheds have eight-digit codes and may be called HUC8 watersheds. They average of 748 square miles. Watershed - Technically speaking, this refers to all sizes of watersheds as defined above. However, it is common to use this term to refer to watersheds of a size smaller than a basin or subbasin. These watersheds have 10- digit codes and may be called HUC10 watersheds. HUC10 watersheds average 64 square miles. Subwatershed - Subwatersheds are smaller watersheds, on the scale of a community. These watersheds have 12- digit codes and may be called HUC12 watersheds. HUC12 watersheds average 4.4 square miles.