YELLOWSTONE RIVER BASIN

                                           06329500  YELLOWSTONE RIVER NEAR SIDNEY, MT
                                      (National stream quality accounting network station)
                                          (National water-quality assessment program)

LOCATION.--Lat 4740'42", long 10409'22", in SW1/4NE1/4SW1/4 sec.9, T.22 N., R.59 E., Richland County, Hydrologic Unit 10100004, 
   on left bank at Montana-Dakota Utilities Company powerplant, 0.2 mi downstream from bridge on State Highway 23, 2.5 mi south
   of Sidney, 3.0 mi downstream from Fox Creek, and at river mile 29.2.

DRAINAGE AREA.--69,103 mi2.  Area at site 4.5 mi upstream, 68,812 mi2.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1910 to September 1931 (published as "at Intake"), October 1933 to current year.  If monthly figures
   of diversions to Lower Yellowstone Canal at Intake are added to records at this site, records  equivalent to those published
   as Yellowstone River at Glendive (1898-1910, 1931-34) can be obtained.  Monthly discharge only for some periods, published in
   WSP 1309.  Monthly figures of diversions into Lower Yellowstone Canal prior to 1951 published in WSP 1309, 1951-60 published
   in WSP 1729, 1961-65 published in WSP 1916, 1966-70  published in WSP 2116, and 1971 to current year are published in annual
   reports.

GAGE.--Water-stage recorder.  Datum of gage is 1,881.3 ft above sea level (levels by U.S. Army Corps of Engineers).  Jan. 1, 1911,
   to Sept. 30, 1931, nonrecording gage at site 32 miles upstream at different datum.  Apr. 9, 1934, water-stage recorder at two
   sites within 500 ft of highway bridge 0.2 mi upstream and May 17, 1945, to Apr. 3, 1952, nonrecording gage on same bridge at
   datum 1.36 ft higher.  Apr. 4, 1952, to Nov. 19, 1967, water-stage recorder at site 4.5 mi upstream at different datum.

REMARKS.--Water-discharge records good except those for estimated daily discharges, which are poor.  Flow regulated to some extent>
   by Bighorn Lake, usable capacity, 1,312,000 acre-ft, on the Bighorn River and on other tributary streams in Wyoming and Montana.
   Diversion for irrigation of about 1,250,000 acres upstream from station.  Lower Yellowstone Project Main Canal diverts from
   left bank in NW1/4 sec.36, T.18 N., R.56 E., at Lower Yellowstone diversion dam at Intake about 36.6 mi upstream for irrigation
   of about 52,000 acres of which about one-third lies upstream from station.  U. S. Army Corps of Engineers satellite telemeter
   at station.

                          DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
                                                       DAILY MEAN VALUES

         DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

           1      8040     7890     7190    e6500    e6000    e6500     6130     7340    34000    16200     4780     3160
           2      7690     7880     7290    e6300    e6000    e6500     6170     7120    34100    15300     4710     3300
           3      8230     7830     7270     6200    e6000    e6600     6080     8240    31400    14600     4690     3470
           4      8490     7850     7220     4850    e6200    e6600     6080    10600    29400    14900     4640     3670
           5      8860     7870     7120     5750    e6500    e6600     5790     9180    26400    16000     4660     3760

           6      8960     7920     6910     5180    e6500    e6700     5810     9630    25500    16700     4740     3890
           7      8940     7760     6900     5890    e6400    e6600     5700    12000    27500    15200     4570     3980
           8      8900     7460     6830     5690    e6300    e6600     5630    14100    28400    14300     4460     4010
           9      8830     7560     6720     5760    e6300    e6600     5590    14300    29100    13800     4390     4030
          10      8860     7600     6690    e6000    e6300    e6600     5610    13400    30400    11700     4390     4040

          11      8770     7570     6610    e6000    e6300    e6600     5660    12200    32000    14500     4380     4060
          12      8870     7530     6700    e5500    e6200    e6700     5400    11000    31600    13100     4240     4100
          13      8880     7470     6380    e5000    e6100    e6800     5330    10100    29100    11400     3880     4200
          14      8880     7460     6220    e5000    e6000     6560     5550     9590    25300     9880     3650     4210
          15      8900     7480     6190    e5200    e6000     6600     5690     9120    22400     8900     3600     4180

          16      8930     7460     6470    e5500    e5800     6530     5820     8400    22200     7850     3450     4160
          17      8920     7460     6820    e6000    e6200     6460     5980     7590    23200     7240     3350     4080
          18      8750     7450     6910     5230    e6200     6380     5930     6730    20800     6830     3260     4000
          19      8530     7470     6470     6100    e6200     6280     6120     5960    22300     6570     3080     3930
          20      8490     7440     6120     6410    e6200     6180     6390     5720    21400     6350     3030     3930

          21      8550     7440     7010     6640    e6000     6090     6180    10000    19100     6410     2980     3950
          22      8560     7280     6220     6530    e5900     6040     6010    12900    17900     6780     2920     4070
          23      8550     7100     6600     6710    e6000     6040     6050    14400    20000     6940     2930     4280
          24      8550     7050    e6700     6620    e6200     6030     6050    14100    20400     6910     2940     4530
          25      8490     7020    e6800    e6500    e6500     5980     6020    15100    18200     6610     2930     4750

          26      8450     6980    e6900    e6400    e6500     5940     6590    17800    18100     6130     2900     5360
          27      8440     7000    e6800    e6300    e6500     5860     7900    21600    18700     5720     2880     5720
          28      8460     7020    e6800    e6400    e6500     5880     8970    23600    19600     5430     2890     6000
          29      8420     7080    e6700    e6800    e6500     5930     8660    26300    19700     5210     2900     6300
          30      8430     7030    e6700    e6500      ---     6030     7890    27600    17900     5050     2920     6400
          31      8140      ---    e6600    e6200      ---     6010      ---    27200      ---     4880     3050      ---

         TOTAL  266760   223410   208860   185660   180300   196820   186780   402920   736100   307390   114190   129520
         MEAN     8605     7447     6737     5989     6217     6349     6226    13000    24540     9916     3684     4317
         MAX      8960     7920     7290     6800     6500     6800     8970    27600    34100    16700     4780     6400
         MIN      7690     6980     6120     4850     5800     5860     5330     5720    17900     4880     2880     3160
         AC-FT  529100   443100   414300   368300   357600   390400   370500   799200  1460000   609700   226500   256900

         STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1911 - 2000, BY WATER YEAR (WY)*                                

         MEAN     8371     7401     5999     5764     6924    11080    10430    18490    39260    23370     8851     7234
         MAX     29130    12150     9594    13110    17750    25980    39160    38100    77280    55000    20470    16000
         (WY)     1924     1924     1976     1925     1971     1972     1924     1928     1918     1917     1912     1941
         MIN      3726     3700     3019     2087     2702     5191     2821     5409    11580     3311     1602     2389
         (WY)     1922     1922     1961     1937     1936     1961     1961     1961     1919     1919     1961     1934

         SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1911 - 2000*

         ANNUAL TOTAL                     4837650                    3138710                                             
         ANNUAL MEAN                        13250                       8576                      12780                  
         HIGHEST ANNUAL MEAN                                                                      21250              1924
         LOWEST ANNUAL MEAN                                                                        5814              1934
         HIGHEST DAILY MEAN                 53500     Jun 26           34100     Jun  2          142000       Jun 21 1921
         LOWEST DAILY MEAN                   6120     Dec 20            2880     Aug 27             570       May 17 1961
         ANNUAL SEVEN-DAY MINIMUM            6460     Dec 14            2910     Aug 24            1010       Aug  8 1961
         INSTANTANEOUS PEAK FLOW                                      a36000     Jun  1         c159000       Jun 21 1921
         INSTANTANEOUS PEAK STAGE                                        b11.86  Jan 15             b24.03    Mar  6 1994
         INSTANTANEOUS LOW FLOW                                                                    d470       May 17 1961
         ANNUAL RUNOFF (AC-FT)            9595000                    6226000                    9257000                  
         10 PERCENT EXCEEDS                 29500                      17000                      28600                  
         50 PERCENT EXCEEDS                  8820                       6600                       8140                  
         90 PERCENT EXCEEDS                  7030                       4090                       4200                  

          SUMMARY STATISTICS          WATER YEARS 1911 - 1965**               WATER YEARS 1967 - 2000***


         ANNUAL TOTAL                                                                                     
         ANNUAL MEAN                        12890                            12730                  
         HIGHEST ANNUAL MEAN                21250      1924                  19150             1997
         LOWEST ANNUAL MEAN                  5814      1934                   7319             1988
         HIGHEST DAILY MEAN                142000     Jun 21 1921           104000      May 23 1978
         LOWEST DAILY MEAN                    570     May 17 1961              800      Jan  2 1989
         ANNUAL SEVEN-DAY MINIMUM            1010     Aug  8 1961             1500      Aug 21 1988
         INSTANTANEOUS PEAK FLOW          c159000     Jun 21 1921          g111000      May 23 1978
         INSTANTANEOUS PEAK STAGE             f21.85  Mar 22 1947              b24.03   Mar  6 1994
         INSTANTANEOUS LOW FLOW              d470     May 17 1961             d470      May 17 1961
         ANNUAL RUNOFF (AC-FT)            9341000                          9226000                  
         10 PERCENT EXCEEDS                 29900                            27400                  
         50 PERCENT EXCEEDS                  7690                             8860                  
         90 PERCENT EXCEEDS                  3820                             5130                  

         *--During period of operation 1911-31, 1934-current year.  Published as "at Intake" 1911-31.
         **--Prior to Bighorn Lake reaching operational level.
         ***-- After Bighorn Lake reached operational level.
         a--Gage height, 11.09 ft.
         b--Backwater from ice.
         c--Gage height, 12.6 ft, site and datum then in use.
         d--Gage height, 2.73 ft, site and datum then in use.
         e--Estimated.
         f--Backwater from ice, site and datum then in use.
         g--Gage height, 20.02 ft.

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