USGS Map of major basin drainages in the contiguous United States.
The Boulder Creek Watershed is in Unit 10, the Missouri River Basin, which in turn flows into
units 07 and 08, the upper and lower Mississippi Basins.
USGS Map of major basin drainages in the Hydrologic Units in the contiguous United States.
Can you find approximately where the St. Vrain and Boulder Creek Watersheds would be located?
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