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0 2 1 2 0 4 100301021502 UPPER MISSOURI SMITH JUDITH BELT UPPER MISSOURI- DEARBORN SUN ARROW § ¨ ¦ 15 £ ¤ 12 £ ¤ 89 £ ¤ 12 Mis s o u r i Rive r £ ¤ 87 £ ¤ 12 £ ¤ 87 £ ¤ 294 T r o u t C r e e k Li ttle Belt Creek B i g B i r c h C re e k H i gh w o o d C re e k Confedera te Gul ch D r y W o l f C r e e k D e e p C re e k A r r o w Cr e e k C a m a s C r e e k £ ¤ 12 B oze man F or k M us s el s h e ll R i ve r W i llow Creek ¬ « 200 S un R ive r £ ¤ 287 B ox E l d e r C r e e k Big O t ter C reek £ ¤ 89 So uth Fork Ju dith Riv er H a y C r ee k N o r th Fo r k S m ith Rive r A v a la n c h e C r e e k Te nderf oot Cre e k £ ¤ 89 So uth Fo rk M u ss e l sh ell Ri ve r S ix teenm i l e Cr e ek M i n g C o u l e e Hound Cr e e k S h eep Cr e e k N e w l an C reek C ro wC re ek S u r pri se C re e k B i r d C ree k R o c k C r e e k S m i t h R i v e r S an d C oul ee C re e k S ho nkin Cr e e k L o n e T r e e C r e e k Be l t C re ek Lit tle M ud d y C r e e k B a ttl e C r e e k N o r th F o r k M u s se l s h e l l R i v er B e a v e r C r e e k Dry Creek South F o rk Sm ith R i v er 1003010105 1007000303 1003010107 1003010104 1003010101 1003010108 1003010109 1003010302 1003010110 1004020102 1004020101 1003010113 1003010111 1003010301 1003010303 1003010112 1003010116 1003010305 1004010303 1003010306 1003010117 1003010304 1003010120 1003010307 1003010501 1003010308 1004010311 1003010310 1003010309 1003010503 1003010205 1003010206 1004010202 1003010311 1003010502 1003010209 1003010210 1003010207 1003010208 1003010504 1003010212 1003010213 1003010407 1003010409 1003010215 White Sulphur Springs Ulm Townsend Simms Sand Coulee Neihart Great Falls Geyser Cascade Belt Legend Lake - Reservoir Perennial River Intermittent Stream Sub Watershed (Sixth Code) County Watershed (Fifth Code) Sub Basin (Fourth Code) ¹ 1:450,000 Map Scale: Sub Basin within Montana Basins SMITH 10030103 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.
