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USGS
Water Resources of Colorado


ARKANSAS RIVER BASIN

07124000 ARKANSAS RIVER AT LAS ANIMAS, CO

LOCATION.--Lat 38°04'51", long 103°13'09", in SE14NE14 sec.3, T.23 S., R.52 W., Bent County, Hydrologic Unit 11020009, on right bank at upstream side of bridge on U.S. Highway 50, 1.1 mi north of courthouse in Las Animas, and 4.2 mi upstream from Purgatoire River.

DRAINAGE AREA.--14,417 mi2, of which 441 mi2 are probably noncontributing.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May to November 1898 (gage heights only), August to November 1909 (gage heights and discharge measurements only), May 1939 to current year. Statistical summary computed for 1975 to current year, subsequent to partial regulation by Pueblo Reservoir. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07124000

REVISED RECORDS.--WSP 1341: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 3,883.97 ft above NGVD of 1929. May 13 to Nov. 12, 1898, and Aug. 1 to Nov. 10, 1909, nonrecording gages near present site at different datums. May 23, 1939 to Apr. 27, 1967, water-stage recorder at site 0.4 mi downstream at datum 9.00 ft lower.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by storage reservoirs, power developments, transbasin and transmountain diversions, diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants. Flow partly regulated by Pueblo Reservoir (station 07099350) about 104 mi upstream since Jan. 9, 1974.

Discharge, cubic feet per second 
WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES
DAY
OCT
NOV
DEC
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
1

15

14

77

e80

75

80

15

12

505

697

99

50

2

17

14

76

e85

71

73

15

13

437

433

90

53

3

16

13

73

87

71

69

14

12

439

349

69

69

4

16

13

73

80

71

67

13

11

877

273

51

56

5

16

13

72

77

76

65

13

11

1,090

231

45

53

6

16

14

77

73

77

64

15

12

940

221

37

61

7

16

12

83

70

e70

77

14

12

736

187

31

58

8

16

12

83

72

e65

83

15

11

567

157

31

57

9

15

12

84

e75

64

84

15

11

237

131

44

55

10

15

12

87

e75

71

83

14

11

525

109

52

44

11

13

12

85

e74

90

84

14

11

682

94

65

17

12

13

12

83

73

92

83

15

11

681

77

61

19

13

13

12

83

75

80

81

14

14

693

65

45

37

14

13

13

81

83

74

78

14

11

723

53

45

51

15

12

28

77

84

71

67

14

19

693

52

39

56

16

13

34

76

e75

68

35

14

21

625

46

37

52

17

13

30

76

69

65

46

14

18

613

42

36

38

18

13

28

75

e68

66

30

13

15

595

41

36

38

19

12

51

71

e66

82

30

15

17

569

33

37

50

20

12

62

e65

66

86

27

15

24

414

24

37

53

21

12

64

e65

66

77

26

15

16

425

20

37

51

22

13

62

e63

e65

67

24

14

14

596

22

37

50

23

13

60

e60

e60

63

23

16

17

465

51

36

50

24

13

63

e63

e65

e62

21

25

20

506

80

36

48

25

13

65

e65

e75

e60

20

15

20

463

53

35

48

26

13

64

e65

e80

e62

18

15

27

512

41

39

46

27

15

64

e67

90

65

17

14

51

560

64

41

36

28

14

64

e70

93

91

17

14

41

511

82

40

35

29

13

69

e75

88

---

16

14

82

480

79

41

40

30

14

74

e80

82

---

16

12

139

545

64

45

40

31

14

---

e75

77

---

16

---

251

---

159

49

---

TOTAL

432

1,060

2,305

2,348

2,032

1,520

439

955

17,704

4,030

1,423

1,411

MEAN

13.9

35.3

74.4

75.7

72.6

49.0

14.6

30.8

590

130

45.9

47.0

MAX

17

74

87

93

92

84

25

251

1,090

697

99

69

MIN

12

12

60

60

60

16

12

11

237

20

31

17

AC-FT

857

2,100

4,570

4,660

4,030

3,010

871

1,890

35,120

7,990

2,820

2,800

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2003, BY WATER YEAR (WY)
MEAN

153

145

142

183

190

119

123

562

855

465

295

108

MAX

1,092

810

398

641

761

422

877

4,043

4,263

3,339

1,343

373

(WY)

(1985)

(1998)

(1998)

(1998)

(1985)

(1998)

(1987)

(1999)

(1995)

(1995)

(1999)

(1984)

MIN

5.13

6.05

8.40

8.45

18.5

9.44

10.8

14.1

16.8

10.0

14.5

9.12

(WY)

(1978)

(1975)

(1978)

(1978)

(1978)

(1975)

(1978)

(1981)

(2002)

(2002)

(2002)

(1977)

SUMMARY STATISTICS
FOR 2002 CALENDAR YEAR
FOR 2003 WATER YEAR
WATER YEARS 1975 - 2003
ANNUAL TOTAL
16,201.7
35,659
ANNUAL MEAN
44.4
97.7
a279
HIGHEST ANNUAL MEAN
841 1995
LOWEST ANNUAL MEAN
59.8 2002
HIGHEST DAILY MEAN
222 Jan 5
1,090 Jun 5
b22,600 May 3, 1999
LOWEST DAILY MEAN
7.5 Aug 17
11 May 4
c3.0 Nov 30, 1974
ANNUAL SEVEN-DAY MINIMUM
7.8 Aug 12
11 May 4
4.1 Sep 26, 1977
MAXIMUM PEAK FLOW
1,220 Jun 5
d32,900 May 2, 1999
MAXIMUM PEAK STAGE
8.03 Jun 5
f14.02 May 2, 1999
ANNUAL RUNOFF (AC-FT)
32,140
70,730
201,800
10 PERCENT EXCEEDS
114
225
554
50 PERCENT EXCEEDS
21
53
112
90 PERCENT EXCEEDS
9.4
13
16

e Estimated.
a Average discharge for 34 years (water years 1940-73), 203 ft3/s; 147,100 acre-ft/yr, prior to completion of Pueblo Dam.
b Maximum daily discharge for period of record, 25,800 ft3/s, May 20, 1955.
c Minimum daily discharge for period of record, 0.9 ft3/s, Jul 31, Aug 1 and 3, 1964.
d From rating curve extended above 21,600 ft3/s; maximum discharge and stage for period of record, 44,000 ft3/s, May 20, 1955, gage height, 15.03 ft, from current-meter measurement and slope-area measurement of over-flow channel, site and datum then in use.
f From floodmark.


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Water Resources of Colorado
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Last Modified: April 28, 2004