USGS 05020500 St. Mary River at International Boundary

PROVISIONAL DATA SUBJECT TO REVISION

Click to hidestation-specific text
Flood Tracking - Stage Flood Tracking - Discharge Gage-height Corrections Base Rating Shifted Rating
(About shift-adjusted ratings).
Station operated jointly by the USGS Wyoming-Montana Water Science Center and Water Survey Canada in cooperation with the U.S. Department of State and in accordance with the Boundary Waters Treaty of 1909 as overseen by the International Joint Commission and in cooperation with the U.S. Bureau of Reclamation .
Station photographs | 1 |
Leaving USGS: U.S. Coast Guard boating safety tips.
This station managed by the Helena Field Unit.

Available Parameters Available Period
  
1989-10-01  2025-09-02
2007-10-01  2025-09-02







 (7)
 
  -- or --

 

 
Summary of all available data for this site
Instantaneous-data availability statement

Discharge, cubic feet per second
Most recent instantaneous value: 337 09-02-2025   01:10 MDT
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Sep 2 based on 123 water years of record more
Min
(1998)		 25th
percen-
tile		 Most Recent
Instantaneous
Value Sep 2		 Median Mean 75th
percen-
tile		 Max
(1911)
126 294 337 394 466 565 1380

Gage height, feet
Most recent instantaneous value: 4.06 09-02-2025   01:10 MDT
Graph of Gage height, feet

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