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!O
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!.
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BIG HORN
ROSEBUD
CUSTER
POWDERRIVER
UPPERTONGUE
LITTLEPOWDER
MIDDLEPOWDER
ROSEBUD
MIZPAH
LOWERTONGUE
LOWERPOWDER
LOWERYELLOWSTONE-
SUNDAY
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Yellowstone River
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e Rive
r
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Powd
erRi
ver
South Sunday Creek
Powd
er River
Sunda
y Creek
Pump
kinCr
eek
Muddy Creek
Locate Creek
Greenle
afCr
eek
Littl ePo wderRiver
Ash Creek
North Sunday Creek
Sweeney Creek
§̈¦94
Little Porcupine Creek
Big Porcupine Creek
Tong
ueRiv
er
Roseb ud Creek
WestFo
rkMu
ddy C
reek
Home Creek
East F
ork Litt
le Pum
pkin C
reek
¬«59
Squirrel Creek
Moon Creek
Beaver Creek
Cotto
nwoo
d Cree
k
Sheep Creek
Horse
C ree
k
Little Pumpkin Creek
Cache Creek
East Fork Armells Creek
Hanging Woman Creek
Sand
Creek
Indian Creek
Foste rCreek
Cook Creek
Bear Creek
Sarpy Creek
Stellar Creek
Sand Creek
Pilgrim Creek
Otter Creek
Mizp
ahCr
eek
East F
ork Ho
rse Cre
ek
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Rosebud
MilesCity
LameDeer
Forsyth
Colstrip
Busby
Broadus
Ashland
LegendLake - ReservoirPerennial RiverSub Watershed (Sixth Code)CountyWatershed (Fifth Code)Sub Basin (Fourth Code)
¹1:576,000Map Scale:
Sub Basin within Montana Basins
LOWER TONGUE10090102HUCBasin - 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 or
subbasin. 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. HUC12
watersheds average 4.4 square miles.