# //UNITED STATES GEOLOGICAL SURVEY http://water.usgs.gov/ # //NATIONAL WATER INFORMATION SYSTEM http://water.usgs.gov/data.html # //DATA ARE PROVISIONAL AND SUBJECT TO CHANGE UNTIL PUBLISHED BY USGS # //RETRIEVED: 2026-09-30 16:35:02 # //WARNING # //WARNING The stage-discharge rating provided in this file should be # //WARNING considered provisional and subject to change. Stage-discharge # //WARNING ratings change over time as the channel features that control # //WARNING the relation between stage and discharge vary. Users are # //WARNING cautioned to consider carefully the applicability of this # //WARNING rating before using it for decisions that concern personal or # //WARNING public safety or operational consequences. # //FILE TYPE="NWIS RATING" # //DATABASE NUMBER=01 DESCRIPTION=" Standard data base for this site." # //STATION AGENCY="USGS " NUMBER="06205000 " TIME_ZONE="MST" DST_FLAG=Y # //STATION NAME="Stillwater River near Absarokee, MT" # //LABEL="Discharge ft^3/s" # //PARAMETER CODE="00060" # //RATING ID="24.0" TYPE="STGQ" NAME="stage-discharge" AGING=Working # //RATING REMARKS="New Rating 24 developed due to scour on lower end of Rating 23 (below 2.75 ft) and fill on the upper-medium portion (3.00-6.00 ft) of the rating. The most recent GZF (2022, long ago) was 0.29 ft and scour is known to have occurred to a fair amount. A current GZF would have been helpful but wasn't available. -0.10 ft was used for Rating 24.0's offset. Measurements from 2022-2026 were considered but not all were used. Section control exists below 2.0 ft of stage, combined control from 2.00-5.00 ft of stage, and channel control above that until extreme flows hit the bridge around 8.00-10.0 ft of stage. Added a breakpoint high up (8.13 ft) where flows would begin to pile on the bridge. Offset for the upper portion was selected by plotting the upper section and visually making a straight line. Despite several minor reversals, Rating 24 passes the smoothing check document.\\nOffice Note 9/30/26 EEE: Reviewed rating. Ran through revised rating smoothing check. Couple minor reversals. OK" # //RATING EXPANSION="logarithmic" # //RATING BREAKPOINT1=8.130000E+00 # //RATING OFFSET1=-1.000000E-01 OFFSET2=7.000000E+00 # //RATING_INDEP ROUNDING="????" PARAMETER="Gage height (ft)" # //RATING_DEP ROUNDING="????" PARAMETER="Discharge (ft^3/s)" # //RATING_DATETIME BEGIN=20250523000000 BZONE=-07:00 END=-------------- EZONE=--- AGING=None # //RATING_DATETIME COMMENT="Changed from Rating 23.0 to 24.0 during low point after first snowmelt peak. Fill condition that Rating 24.0 was created for exists during high water in 2025, so the timing of the rating change works well." INDEP DEP STOR 16N 16N 1S -1.0000000E-01 0.0000000E+00 * 1.9000000E-01 1.0581293E+01 * 2.1600000E+00 7.8000000E+02 * 4.3800000E+00 2.8900000E+03 * 5.9300000E+00 5.6000000E+03 * 8.1300000E+00 1.2500000E+04 * 1.0600000E+01 1.7600000E+04 *