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USGS
Water Resources of Colorado


PLATTE RIVER BASIN

06730200 BOULDER CREEK AT NORTH 75TH STREET NEAR BOULDER, CO

LOCATION.--Lat 40°03'06", long 105°10'42", in SE14NW14 sec.13, T.1 N., R.70 W., Boulder County, Hydrologic Unit 10190005, on left bank, 50 ft downstream (revised) from bridge on North 75th Street, 0.2 mi downstream from Boulder feeder ditch, and 6 mi northeast of Boulder.

DRAINAGE AREA.--304 mi2.

PERIOD OF RECORD.--October 1986 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=06730200

GAGE.--Water-stage recorder with satellite telemetry, and concrete control. Elevation of gage is 5,106 ft above NGVD of 1929, from topographic map.
Prior to Apr. 14, 2003 gage located at site 100 ft upstream at same datum.

REMARKS.--Records poor. Flow is partially regulated by Barker Reservoir, and affected by Boulder feeder ditch, Boulder sewage treatment plant, and Public Service power plant. Starting about Feb. 2003, Boulder Sewage Treatment Plant moved its wastewater discharge (point) to site about 300 ft downstream from current gage location and City of Lafayette began diversions for municipal supply upstream from gage. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality Data 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

67

55

e25

e26

e28

e10

e21

31

1,300

131

59

60

2

116

43

e25

e26

e20

e14

e69

20

945

120

40

57

3

81

45

e25

e27

e18

e16

e77

25

681

106

39

67

4

70

39

e28

e28

e16

e10

e74

20

468

84

47

51

5

62

34

e28

e29

e13

e5.9

e68

24

354

71

71

35

6

54

34

e27

e27

e14

e3.1

e62

17

215

57

72

28

7

55

32

e26

e27

e17

e2.6

e50

24

204

52

70

37

8

53

32

e25

e26

e16

e5.9

e43

36

126

35

70

45

9

53

28

e25

e28

e15

e11

e32

38

93

27

80

48

10

57

27

e27

e34

e17

e12

e35

213

130

26

84

49

11

56

27

e26

e36

e20

e13

e38

140

182

25

80

38

12

50

25

e24

e36

e24

e15

e48

107

219

26

92

39

13

50

26

e23

e36

e25

e13

e69

84

211

e29

95

24

14

50

23

e23

e34

e27

e14

e106

86

216

e32

97

21

15

50

20

e23

e31

e24

e16

127

123

249

e36

96

25

16

49

21

e23

e30

e21

e14

102

278

260

e40

97

18

17

47

20

e24

e30

e19

e14

101

169

221

46

95

15

18

46

21

e25

e30

e17

e27

106

147

359

50

135

14

19

57

20

e27

e30

e16

e45

146

148

387

66

120

8.8

20

58

19

e28

e30

e16

e61

102

200

332

62

107

9.8

21

59

19

e29

e30

e15

e75

81

185

259

65

95

7.3

22

59

19

e25

e30

e13

e78

83

165

219

55

96

6.9

23

63

17

e28

e32

e12

e58

94

176

243

43

101

8.6

24

59

18

e34

e33

e13

e92

119

252

232

32

93

12

25

53

20

e40

e27

e12

e61

85

259

246

49

79

12

26

48

20

e43

e25

e8.6

e65

79

266

176

72

86

16

27

49

e29

e39

e24

e6.5

e33

82

353

132

66

92

18

28

49

e27

e33

e25

e8.0

e13

79

735

108

64

81

14

29

67

e26

e27

e25

---

e4.8

78

1,060

108

73

65

9.4

30

80

e25

e26

e27

---

e6.0

54

1,700

125

72

161

12

31

67

---

e26

e30

---

e8.3

---

1,600

---

70

92

---

TOTAL

1,834

811

857

909

471.1

816.6

2,310

8,681

9,000

1,782

2,687

805.8

MEAN

59.2

27.0

27.6

29.3

16.8

26.3

77.0

280

300

57.5

86.7

26.9

MAX

116

55

43

36

28

92

146

1,700

1,300

131

161

67

MIN

46

17

23

24

6.5

2.6

21

17

93

25

39

6.9

AC-FT

3,640

1,610

1,700

1,800

934

1,620

4,580

17,220

17,850

3,530

5,330

1,600

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 2003, BY WATER YEAR (WY)
MEAN

49.5

53.2

49.7

46.1

43.7

48.8

85.0

190

287

201

139

73.2

MAX

77.8

81.7

74.9

68.3

61.3

90.6

236

465

868

492

235

111

(WY)

(1997)

(1998)

(1989)

(1987)

(1996)

(1998)

(1998)

(1995)

(1995)

(1995)

(1999)

(1995)

MIN

31.5

27.0

27.6

28.8

16.8

26.3

37.4

97.3

86.0

57.5

86.7

26.9

(WY)

(1987)

(2003)

(2003)

(2002)

(2003)

(2003)

(1989)

(2002)

(2002)

(2003)

(2003)

(2003)

SUMMARY STATISTICS
FOR 2002 CALENDAR YEAR
FOR 2003 WATER YEAR
WATER YEARS 1987 - 2003
ANNUAL TOTAL
21,900
30,964.5
ANNUAL MEAN
60.0
c84.8
106
HIGHEST ANNUAL MEAN
198 1995
LOWEST ANNUAL MEAN
61.0 2002
HIGHEST DAILY MEAN
208 May 24
1,700 May 30
1,700 May 30, 2003
LOWEST DAILY MEAN
17 Nov 23
e2.6 Mar 7
e2.6 Mar 7, 2003
ANNUAL SEVEN-DAY MINIMUM
19 Nov 19
e7.2 Mar 4
e7.2 Mar 4, 2003
MAXIMUM PEAK FLOW
a2,050 May 30
a2,050 May 30, 2003
MAXIMUM PEAK STAGE
4.97 May 30
b4.97 May 30, 2003
ANNUAL RUNOFF (AC-FT)
43,440
c61,420
76,660
10 PERCENT EXCEEDS
124
172
215
50 PERCENT EXCEEDS
51
39
62
90 PERCENT EXCEEDS
26
14
33

e Estimated.
a From rating curve extended above 500 ft3/s.
b Maximum gage height, 7.85 ft, May 17, 1995, site and datum then in use.
c Significantly affected by changes in water operations by Cities of Boulder and Lafayette that began about Feb. 2003.


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Water Resources of Colorado
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