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Streamflow Measurements for Montana

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Questions or concerns about USGS data and data products in Montana and Wyoming can be directed to the Wyoming-Montana Water Science Center Data Management Section.


! Streamflow measurement pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline and new pages.

USGS 12304500 Yaak River near Troy MT

Lincoln County, Montana
Hydrologic Unit Code 17010103
Latitude  48°33'42.20", Longitude 115°58'12.57" NAD83
Drainage area 792  square miles
Gage datum 1,839 feet above NGVD29

Period of record
Begin Date End Date Count
1931-09-08 2025-12-12 397

 
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