HEART RIVER BASIN

                                     06343500  E.A. PATTERSON LAKE NEAR DICKINSON, ND

LOCATION.--Lat 4652'11", long 10249'37", in NE1/4NW1/4SW1/4 sec.8, T.139 N., R.96 W., Stark County, Hydrologic Unit 
   10130202, at left edge of spillway, and 2 mi southwest of Dickinson.

DRAINAGE AREA.--400 mi2, approximately.

MONTHEND-ELEVATION AND CONTENTS RECORDS

PERIOD OF RECORD.--May 1950 to current year.  Prior to October 1958, published as Dickinson Reservoir near Dickinson.

GAGE.--Water-stage recorder.  Datum of gage is at sea level (levels by Bureau of Reclamation).  Prior to Jan. 4, 1961, 
   nonrecording gage at same site and datum.

REMARKS.--Reservoir is formed by earth-fill dam; storage began May 23, 1950; dam completed Aug. 9, 1950.  Total capacity 
   is 24,600 acre-ft at maximum pool, elevation, 2,428.9 ft.  Dead storage is 1,000 acre-ft below lowest point of outlet, 
   elevation, 2,404.0 ft.  Conservation storage is 9,100 acre-ft between elevations 2,404.0 ft and 2,420.0 ft, crest of 
   spillway.  The crest of the spillway was raised 3.5 ft in 1981 from 2,416.5 ft.  Figures given herein represent total 
   contents based on capacity table dated 1991.  The reservoir is for flood control, irrigation, and municipal supply.

COOPERATION.--Records furnished by U.S. Bureau of Reclamation.  Extremes are those observed.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 11,590 acre-ft, June 9, 1982, elevation, 2,421.13 ft; minimum since
   initial filling of reservoir, 2,080 acre-ft, Feb. 8, 1993, elevation, 2,408.08 ft.

EXTREMES FOR CURRENT YEAR.--Maximum contents 7,020 acre-ft, Apr. 1, elevation, 2,418.57 ft; minimum, 4,720 acre-ft, 
   Sept. 30, elevation, 2,416.06 ft.


                       MONTHEND ELEVATION AND CONTENTS, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
                       
___________________________________________________________________________________________________________________

                     Date                            Elevation             Contents           Change in contents
                                                      (feet)             (acre-feet)             (acre-feet)
___________________________________________________________________________________________________________________

Sept.30 ----------------------------                  2,417.60              6,060                    --
Oct. 31 ----------------------------                  2,417.73              6,180                    +120
Nov. 30 ----------------------------                  2,417.76              6,210                     +30
Dec. 31 ----------------------------                  2,417.90              6,340                    +130

    CAL YR 1999                                          --                   --                   -1,960

Jan. 31 ----------------------------                  2,418.02              6,460                    +120
Feb. 29 ----------------------------                  2,418.34              6,780                    +320
Mar. 31 ----------------------------                  2,418.53              6,970                    +190
Apr. 30 ----------------------------                  2,418.53              6,970                       0
May  31 ----------------------------                  2,418.18              6,620                    -350
June 30 ----------------------------                  2,418.13              6,570                     -50
July 31 ----------------------------                  2,417.40              5,870                    -700
Aug. 31 ----------------------------                  2,416.42              5,010                    -860
Sept.30 ----------------------------                  2,416.06              4,720                    -290

    WTR YR 2000                                          --                   --                   -1,340
___________________________________________________________________________________________________________________




                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1971, 1975, 1980 to current year.

                                 WATER-QUALITY DATA, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000

                                        DEPTH     SPE-     PH                         ANC
                                        TO TOP   CIFIC    WATER             HARD-   UNFLTRD            MAGNE-
                                          OF      CON-    WHOLE    COLOR    NESS    TIT 4.5  CALCIUM    SIUM,
                                        SAMPLE   DUCT-     LAB     (PLAT-   TOTAL     LAB     DIS-      DIS-
                                        INTER-   ANCE    (STAND-   INUM-    (MG/L    (MG/L    SOLVED   SOLVED
                      DATE      TIME   VAL(IN     LAB      ARD     COBALT    AS       AS      (MG/L    (MG/L
                                       METERS)  (US/CM)   UNITS)   UNITS)   CACO3)   CACO3)   AS CA)   AS MG)
                                       (82047)  (90095)  (00403)  (00080)  (00900)  (90410)  (00915)  (00925)

                  MAY
                    25...       0950     1.0     2040      8.3      39       380      304     71.5     49.9
                  JUL
                    25...       1110     1.0     2100      8.6      45       350      275     60.5     49.3
                  SEP
                    27...       0850     1.0     2370      8.6      25       390      326     66.9     53.2


                                                                                                      SOLIDS,
                                                 SODIUM   POTAS-            CHLO-    FLUO-   SILICA,  SUM OF
                              SODIUM,              AD-     SIUM,  SULFATE   RIDE,    RIDE,    DIS-    CONSTI-
                               DIS-              SORP-     DIS-    DIS-     DIS-      DIS-    SOLVED  TUENTS,
                              SOLVED              TION    SOLVED   SOLVED   SOLVED   SOLVED   (MG/L     DIS-
                      DATE     (MG/L    SODIUM   RATIO    (MG/L    (MG/L    (MG/L    (MG/L     AS      SOLVED
                               AS NA)  PERCENT            AS K)   AS SO4)   AS CL)   AS F)    SIO2)    (MG/L)
                              (00930)  (00932)  (00931)  (00935)  (00945)  (00940)  (00950)  (00955)  (70301)

                  MAY
                    25...       322      64        7      10.4      748     11.9       .3      4.7     1400
                  JUL
                    25...       338      67        8      11.4      800     12.1      <.1      6.4     1440
                  SEP
                    27...       399      68        9      13.0      902     14.5       .4      7.5     1650


                                   SOLIDS,            NITRO-   NITRO-   NITRO-            PHOS-
                                   RESIDUE  SOLIDS,    GEN,     GEN,     GEN,    PHOS-   PHORUS
                                   AT 180     DIS-   NITRITE  NO2+NO3  AMMONIA  PHORUS    ORTHO,   BORON,
                                    DEG. C   SOLVED    DIS-     DIS-     DIS-     DIS-    DIS-      DIS-
                                     DIS-    (TONS    SOLVED   SOLVED   SOLVED   SOLVED  SOLVED    SOLVED
                           DATE     SOLVED    PER     (MG/L    (MG/L    (MG/L    (MG/L   (MG/L     (UG/L
                                    (MG/L)   AC-FT)   AS N)    AS N)    AS N)    AS P)   AS P)     AS B)
                                   (70300)  (70303)  (00613)  (00631)  (00608)  (00666)  (00671)  (01020)

                       MAY
                         25...      1470     1.99     <.010    <.050    .053     E.046    .021      368
                       JUL
                         25...      1500     2.03     <.010    <.050    .158      .072    .065      398
                       SEP
                         27...      1690     2.30     <.010    <.050    .068      .135    .104      438


                                                                             PH
                                                                   SPE-     WATER
                                                                   CIFIC    WHOLE
                                                 RESER-    SAM-    CON-     FIELD   TEMPER-  OXYGEN,
                                                  VOIR    PLING    DUCT-   (STAND-   ATURE     DIS-
                               DATE      TIME    DEPTH    DEPTH    ANCE      ARD     WATER    SOLVED
                                                 (FEET)    (M)    (US/CM)   UNITS)  (DEG C)   (MG/L)
                                                (72025)  (00098)  (00095)  (00400)  (00010)  (00300)

                           MAY
                             25...       0945    12.5      .00     2040      8.2     15.2      8.6
                             25...       0946      --     1.0      2040      8.5     15.2      8.5
                             25...       0947      --     2.0      2040      8.5     15.2      8.5
                             25...       0948      --     3.0      2040      8.5     15.1      8.5
                             25...       0949      --     3.8      2040      8.5     15.1      8.2
                           JUL
                             25...       1100    20.0      .00     2120      8.3     21.6      7.9
                             25...       1101      --     1.0      2120      8.4     21.6      7.7
                             25...       1102      --     2.0      2130      8.4     21.6      7.7
                             25...       1103      --     3.0      2130      8.4     21.6      7.7
                             25...       1104      --     4.0      2130      8.5     21.6      7.7
                             25...       1105      --     5.0      2130      8.5     21.6      7.7
                             25...       1106      --     6.1      2130      8.5     21.6      7.6
                           SEP
                             27...       0840    19.4      .00     2380      8.3     11.4      9.3
                             27...       0841      --      .50     2380      8.4     11.4      9.2
                             27...       0842      --     1.0      2380      8.4     11.4      9.0
                             27...       0843      --     2.0      2390      8.5     11.4      9.0
                             27...       0844      --     3.0      2380      8.5     11.4      8.9
                             27...       0845      --     4.0      2390      8.6     11.4      8.8
                             27...       0846      --     5.0      2390      8.6     11.4      8.5
                             27...       0847      --     5.9      2400      8.6     11.1      7.6


                                            OXYGEN,   BARO-                      WIND
                                              DIS-    METRIC   TRANS-            DIREC-
                                             SOLVED   PRES-     PAR-              TION    WIND
                                             (PER-     SURE     ENCY   TEMPER-   (DEG.    SPEED
                                              CENT     (MM    (SECCHI   ATURE     FROM   (MILES
                                    DATE     SATUR-     OF     DISK)     AIR      TRUE     PER
                                             ATION)    HG)      (IN)   (DEG C)   NORTH)   HOUR)
                                            (00301)  (00025)  (00077)  (00020)  (00036)  (00035)

                                MAY
                                  25...       91       725     20.0     15.0      120     <5.0
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                JUL
                                  25...       99       699     24.0     21.0      295     12
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                  25...        --       --       --       --       --       --
                                SEP
                                  27...       93       701     23.0     10.0      360     <5.0
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --
                                  27...        --       --       --       --       --       --

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