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UPPERMUSSELSHELL

MIDDLEMUSSELSHELL

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FLATWILLOW

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LOWERMUSSELSHELL

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North Willow Creek

Alkali Creek

Blood Creek

Hawk Creek

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Winnett

Roundup

Melstone

Lewistown

Grassrange

LegendLake - ReservoirPerennial RiverIntermittent StreamSub Watershed (Sixth Code)CountyWatershed (Fifth Code)

Sub Basin (Fourth Code)

¹1:400,000Map Scale:

Sub Basin within Montana Basins

FLATWILLOW 10040203HUC

Basin - A basin is a large-scale watershed,such as for the Montana, Missouri, Yellowstoneand Clark Fork rivers. These are also referredto by a U.S. Geological Survey coding schemecalled Hydrologic Unit Codes (HUCs). Each ofthese basins has a six-digit code called HUC6watersheds. HUC6 watersheds cover an averageof 2,525 square miles. Watersheds with moredigits are smaller. Subbasin - Subbasins are smaller scale basins,such as the Clark Fork Yellowstone River, MiddleFork Flathead River, Gallatin River, LowerMusselshell River or Little Bighorn River. Thesewatersheds have eight-digit codes and may becalled HUC8 watersheds. They average of748 square miles.Watershed - Technically speaking, this refersto all sizes of watersheds as defined above.However, it is common to use this term to referto watersheds of a size smaller than a basin orsubbasin. These watersheds have 10- digitcodes and may be called HUC10 watersheds.HUC10 watersheds average 64 square miles.Subwatershed - Subwatersheds are smallerwatersheds, on the scale of a community.These watersheds have 12- digit codes andmay be called HUC12 watersheds. HUC12watersheds average 4.4 square miles.