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USGS
Water Resources of Colorado


RIO GRANDE BASIN

08246500 CONEJOS RIVER NEAR MOGOTE, CO

LOCATION.--Lat 37°03'14", long 106°11'13", in SE14SE14 sec.34, T.33 N., R.7 E., Conejos County, Hydrologic Unit 13010005, on left bank 75 ft downstream from bridge on State Highway 174, 0.4 mi downstream from Fox Creek, 5.3 mi west of Mogote, and 10 mi west of Antonito.

DRAINAGE AREA.--282 mi2.

PERIOD OF RECORD.--April 1903 to October 1905, October 1911 to current year. Monthly discharge only for some periods, published in WSP 1312. Records for March 1900 at site 5.5 mi upstream and May 1905 to September 1911 (some missing periods most years) at site 3.2 mi upstream not equivalent to present site due to inflow. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=08246500

REVISED RECORDS.--WSP 898: 1911(M). WSP 1312: 1903-5 (monthly discharge and runoff).

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 8,269.39 ft (revised) above NGVD of 1929, Colorado State Highway datum.
Apr. 17, 1903 to Oct. 31, 1905, nonrecording gage 400 ft downstream at different datum. Oct. 5, 1911 to early 1915, nonrecording gage, and from early 1915 to Oct. 1, 1988, water-stage recorder at site 100 ft upstream at datum 2.15 ft higher (revised).

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by diversions for irrigation and return flows from irrigated areas. Some regulation by Platoro Reservoir (station 08244500) about 59 mi upstream since Nov. 7, 1951.

COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.

EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage of Oct. 5, 1911, is the greatest since at least 1854, from information obtained from local residents in 1959.

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

50

38

e29

e29

e33

e29

91

308

1,250

237

145

88

2

59

40

e27

e30

e31

e28

104

299

1,310

230

138

71

3

67

38

e28

e32

e30

e29

90

305

1,160

224

134

69

4

72

38

e27

e33

e29

e34

80

301

1,120

230

108

95

5

74

35

e23

e34

e28

e33

76

273

1,090

210

106

114

6

70

32

e23

e34

e25

e32

72

244

898

206

108

158

7

61

35

e22

e33

e24

e38

63

224

677

201

99

151

8

53

37

e23

e32

e25

e40

52

199

643

189

112

138

9

52

46

e23

e34

e26

e43

62

191

658

184

115

142

10

51

48

e23

e33

e26

e43

76

198

685

174

116

828

11

51

41

e23

e32

e28

53

95

185

663

157

102

704

12

48

36

e23

e32

e32

59

113

206

609

171

108

663

13

44

37

e23

e32

e36

73

120

275

537

169

101

488

14

43

42

e24

e34

e39

87

153

353

465

136

101

362

15

43

42

e24

e33

e40

84

184

477

396

132

92

323

16

42

30

e24

e32

e37

78

173

469

393

164

84

294

17

41

36

e25

e33

e39

63

184

604

453

151

72

220

18

37

36

e24

e32

e41

56

174

752

447

143

58

161

19

36

36

e24

e33

e36

51

151

890

440

129

48

199

20

35

40

e23

e34

e34

46

116

847

469

109

44

202

21

35

42

e24

e35

e34

51

116

862

407

98

44

143

22

34

42

e24

e34

e32

45

140

1,020

364

88

46

110

23

37

41

e26

e34

e31

54

154

1,230

293

108

59

96

24

41

39

e25

e35

e33

61

149

1,340

252

140

70

104

25

44

40

e25

e34

e33

68

161

1,280

278

128

71

97

26

49

33

e25

e31

e31

68

183

1,090

284

108

67

85

27

44

28

e27

e33

e30

75

225

1,210

246

105

63

76

28

45

e30

e28

e33

e30

66

297

1,340

221

150

70

72

29

45

e32

e29

e31

---

58

370

1,500

232

193

105

86

30

39

e30

e30

e32

---

64

352

1,380

236

222

96

93

31

39

---

e30

e33

---

77

---

1,360

---

205

108

---

TOTAL

1,481

1,120

778

1,016

893

1,686

4,376

21,212

17,176

5,091

2,790

6,432

MEAN

47.8

37.3

25.1

32.8

31.9

54.4

146

684

573

164

90.0

214

MAX

74

48

30

35

41

87

370

1,500

1,310

237

145

828

MIN

34

28

22

29

24

28

52

185

221

88

44

69

AC-FT

2,940

2,220

1,540

2,020

1,770

3,340

8,680

42,070

34,070

10,100

5,530

12,760

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1903 - 2003, BY WATER YEAR (WY)
MEAN

116

93.3

51.1

47.5

51.3

79.4

312

1,086

1,265

469

205

131

MAX

515

467

116

116

159

153

800

2,053

3,163

1,502

626

484

(WY)

(1905)

(1966)

(1987)

(1986)

(1983)

(1989)

(1936)

(1937)

(1920)

(1957)

(1952)

(1927)

MIN

34.7

29.9

25.1

22.7

30.0

41.0

138

282

118

37.1

17.1

26.8

(WY)

(1957)

(1931)

(2003)

(1918)

(1904)

(1904)

(1970)

(2002)

(1934)

(2002)

(2002)

(1956)

SUMMARY STATISTICS
FOR 2002 CALENDAR YEAR
FOR 2003 WATER YEAR
WATER YEARS 1903 - 2003
ANNUAL TOTAL
27,891
64,051
ANNUAL MEAN
76.4
175
324
HIGHEST ANNUAL MEAN
592 1920
LOWEST ANNUAL MEAN
80.6 2002
HIGHEST DAILY MEAN
409 May 16
1,500 May 29
4,490 Jun 5, 1905
LOWEST DAILY MEAN
10 Aug 19
e22 Dec 7
a10 Jul 18, 1904
ANNUAL SEVEN-DAY MINIMUM
12 Aug 14
e23 Dec 5
12 Aug 14, 2002
MAXIMUM PEAK FLOW
1,640 May 29
b9,000 Oct 5, 1911
MAXIMUM PEAK STAGE
4.80 May 29
c8.50 Oct 5, 1911
ANNUAL RUNOFF (AC-FT)
55,320
127,000
234,700
10 PERCENT EXCEEDS
220
458
1,010
50 PERCENT EXCEEDS
38
68
95
90 PERCENT EXCEEDS
23
29
41

e Estimated.
a Also occurred Aug 19, 2002.
b Present site and datum, from rating curve extended above 3,100 ft3/s.
c From floodmarks.


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Water Resources of Colorado
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Last Modified: April 28, 2004