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LITTLEBIGHORN

UPPERYELLOWSTONE-

LAKE BASIN

PRYOR

LOWERBIGHORN

UPPERMUSSELSHELL

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Alkali Creek

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Buffalo Creek

Cedar Creek

South Fork Crooked Creek

Williams Coulee

Hibbard Creek

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Little Woody Creek

Big Coulee Creek

East Buffalo Creek

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Little Bighorn River

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Peritsa Creek

Painted Robe Creek

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WordenShepherd

Roundup

ParkCity

Lavina

Laurel

Hardin

Custer

CrowAgency

Broadview

Billings

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

¹1:440,000Map Scale:

Sub Basin within Montana Basins

UPPER YELLOWSTONE-POMPEYS PILLAR 10070007HUC

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.