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USGS
Water Resources of Colorado


GREEN RIVER BASIN

09237500 YAMPA RIVER BELOW STAGECOACH RESERVOIR, CO

LOCATION (REVISED).--Lat 40°17'07", long 106°49'51", in SW14SE14 sec.29, T.4 N., R.84 W., Routt County, Hydrologic Unit 14050001, on left bank, 50 ft downstream from Stagecoach Reservoir, 1.1 mi upstream from Morrison Creek, and 6.5 mi east of Oak Creek.

DRAINAGE AREA.--228 mi2.

PERIOD OF RECORD.--September 1939 to September 1944, monthly discharge only for some periods, published in WSP 1313; October 1956 to September 1972; October 1984 to current year. Prior to October 1990, published as Yampa River near Oak Creek. Statistical summary computed for 1989 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09237500

REVISED RECORDS.--WDR CO-00-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 7,050 ft above NGVD of 1929, from topographic map. Sept. 1939 to Nov. 15, 1939, nonrecording gage, Nov. 16, 1939 to Sept. 1944 and Oct. 1956 to Sept. 1972, water-stage recorder at site 0.2 mi upstream, at different datum. Oct. 1984 to July 15, 2003, water-stage recorder at site 0.3 mi downstream, at different datum.

REMARKS.--Records fair except for estimated daily discharges, whcih are poor. Flow regulated since Dec. 20, 1988, by Stagecoach Reservoir (capacity 33,275 acre-ft), 50 ft upstream. Diversions for irrigation of about 12,000 acres upstream from station. Natural flow of stream affected by 2 diversions for irrigationto Egeria Creek into Colorado River basin and by storage in Stillwater, Yampa and YamColo Reservoirs (total capacity 15,820 acre-ft). Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality For Gaging Stations" section of this report.

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

e31

e56

37

31

33

32

41

78

123

88

64

59

2

e32

87

35

34

28

29

40

93

164

90

64

61

3

e31

76

30

28

28

34

42

98

164

97

64

58

4

e30

61

30

28

31

29

42

97

146

89

64

59

5

e30

46

30

28

28

29

43

79

129

79

62

49

6

e30

49

29

28

26

28

42

89

116

80

63

44

7

e30

48

31

28

21

29

41

90

115

79

63

43

8

e30

55

30

28

28

29

41

90

111

76

64

43

9

e30

75

30

28

28

29

41

90

109

71

61

43

10

e30

50

30

28

28

29

41

87

107

66

60

42

11

e30

49

30

28

28

29

40

87

110

66

64

41

12

e29

49

30

28

28

29

41

89

113

62

64

41

13

e29

48

29

29

28

29

40

89

112

62

64

40

14

e29

46

28

28

28

29

39

89

110

65

64

39

15

e29

40

28

28

28

30

39

89

107

e65

63

39

16

e29

39

28

28

28

29

39

89

102

63

60

38

17

e29

39

28

28

28

30

39

87

98

63

60

38

18

e29

38

28

28

28

30

39

87

96

63

59

38

19

e29

36

28

28

29

31

38

89

95

60

63

38

20

e29

35

27

28

29

35

37

89

95

60

63

36

21

e29

33

27

28

29

38

38

89

95

63

47

44

22

e29

35

27

28

29

39

38

90

94

63

51

62

23

e29

34

27

28

29

39

38

90

97

57

40

55

24

e29

34

27

28

29

40

37

90

98

56

49

37

25

e29

33

27

28

29

40

41

91

93

62

50

37

26

e29

34

27

28

29

41

38

91

86

59

50

57

27

e29

34

27

28

29

41

38

91

91

60

50

75

28

e29

32

27

28

29

41

44

91

86

62

54

74

29

e29

30

27

28

---

39

50

92

86

62

58

71

30

e29

34

27

28

---

38

55

96

90

62

58

73

31

e30

---

27

28

---

43

---

103

---

63

58

---

TOTAL

915

1,355

893

878

793

1,037

1,222

2,789

3,238

2,113

1,818

1,474

MEAN

29.5

45.2

28.8

28.3

28.3

33.5

40.7

90.0

108

68.2

58.6

49.1

MAX

32

87

37

34

33

43

55

103

164

97

64

75

MIN

29

30

27

28

21

28

37

78

86

56

40

36

AC-FT

1,810

2,690

1,770

1,740

1,570

2,060

2,420

5,530

6,420

4,190

3,610

2,920

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 2003, BY WATER YEAR (WY)
MEAN

62.0

60.2

57.5

59.9

59.6

60.5

69.6

107

111

87.5

79.9

71.1

MAX

110

94.7

93.3

89.8

84.8

90.3

166

303

377

172

156

135

(WY)

(1998)

(1996)

(1996)

(1998)

(1997)

(2000)

(1996)

(1996)

(1997)

(1995)

(1997)

(1997)

MIN

25.8

37.3

27.0

28.3

28.3

18.0

32.3

12.4

12.8

22.3

34.4

31.8

(WY)

(1991)

(1991)

(2001)

(2003)

(2003)

(1989)

(1989)

(1989)

(1989)

(1989)

(1989)

(1990)

SUMMARY STATISTICS
FOR 2002 CALENDAR YEAR
FOR 2003 WATER YEAR
WATER YEARS 1989 - 2003
ANNUAL TOTAL
14,035
18,525
ANNUAL MEAN
38.5
50.8
a73.9
HIGHEST ANNUAL MEAN
134 1997
LOWEST ANNUAL MEAN
32.1 1989
HIGHEST DAILY MEAN
87 Nov 2
164 Jun 2
b611 Jun 9, 1997
LOWEST DAILY MEAN
13 May 18
21 Feb 7
c9.4 Jun 1, 1989
ANNUAL SEVEN-DAY MINIMUM
16 Jun 1
27 Feb 5
10 May 29, 1989
MAXIMUM PEAK FLOW
176 Jun 2
d641 Jun 11, 1997
MAXIMUM PEAK STAGE
f2.70 Jun 2
g3.82 Jun 11, 1997
ANNUAL RUNOFF (AC-FT)
27,840
36,740
53,570
10 PERCENT EXCEEDS
54
91
114
50 PERCENT EXCEEDS
42
39
64
90 PERCENT EXCEEDS
19
28
34

e Estimated.
a Average discharge for 25 years (water years 1940-44, 1957-72, 1985-88), 89.4 ft3/s; 64,770 acre-ft/yr, prior to completion of Stagecoach Reservoir.
b Maximum daily discharge for period of record, 1,020 ft3/s, Apr 16, 1962.
c Minimum daily discharge for period of record, 8.9 ft3/s, May 22, 1963.
d Maximum discharge and stage for period of record, 1,400 ft3/s, Apr 16, 1962, gage height, 7.56 ft, from rating curve extended above 570 ft3/s, site and datum then in use.
f Maximum gage height, 3.64 ft, Oct 31, backwater from beaver dam.
g Maximum gage height, 8.08 ft, Mar 8, 1987, backwater from ice.


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