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USGS
Water Resources of Colorado


GUNNISON RIVER BASIN

09149500 UNCOMPAHGRE RIVER AT DELTA, CO

LOCATION.--Lat 38°44'31", long 108°04'49", in SW14SW14 sec.13, T.15 S., R.96 W., Delta County, Hydrologic Unit 14020006, on right bank 525 ft downstream from 5th Street Bridge at west edge of Delta and 1.1 mi upstream from mouth.

DRAINAGE AREA.--1,115 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--April 1903 to October 1931 (no winter records in most years), September 1938 to current year. Monthly discharge only for some periods, published in WSP 1313. Published as "near Delta" 1907-24. Statistical summary computed for 1939 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09149500

REVISED RECORDS.--WSP 1243: 1904. WDR CO-88-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 4,926.49 ft above NGVD of 1929. Feb. 18, 1960 to Mar. 26, 1963, water-stage recorder at site 750 ft upstream at datum 3.43 ft higher. Mar. 27, 1963 to May 12, 1965, water-stage recorder at site 1,050 ft upstream at datum 6.08 ft higher. See WSP 1733 or 1924 for history of changes prior to Feb. 18, 1960.

REMARKS.--Records good except for estimated daily discharges, which are fair. Natural flow of stream affected by water diverted from Gunnison River (see record of diversion through Gunnison tunnel published with station 09128000) and other adjacent basins. Flow regulated by Ridgway Reservoir, since 1986, total capacity 84,590 acre-ft. Diversions for irrigation of about 90,000 acres upstream from station and return flow from irrigated areas.

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

303

308

217

163

137

123

81

97

919

85

117

207

2

284

303

216

149

138

120

59

86

828

84

114

213

3

452

294

210

154

139

118

54

79

630

83

129

208

4

402

290

206

159

134

117

38

83

500

94

138

198

5

367

287

203

156

133

120

30

92

444

86

123

199

6

360

290

203

155

124

118

29

73

334

86

122

287

7

353

279

198

152

121

115

27

66

272

88

129

358

8

350

277

194

151

126

118

28

65

267

73

157

370

9

332

284

188

155

131

119

34

65

275

71

144

427

10

320

295

193

163

123

122

24

76

244

78

133

1,230

11

311

276

188

163

131

126

17

76

151

79

130

1,190

12

304

271

187

162

125

129

15

78

126

83

120

694

13

302

262

184

155

129

132

17

74

119

101

114

709

14

304

263

181

153

140

138

32

73

116

118

109

668

15

290

272

183

154

142

135

34

83

114

110

116

646

16

288

253

182

144

134

127

28

163

109

105

134

619

17

283

248

185

146

124

132

24

138

119

104

146

587

18

277

248

185

139

136

130

23

203

146

101

e150

464

19

275

241

178

146

136

122

27

325

147

96

e155

446

20

270

235

169

147

129

115

30

210

178

109

135

418

21

269

234

178

147

124

117

35

174

185

109

128

389

22

248

237

168

146

125

112

43

149

166

106

150

362

23

294

240

159

144

122

107

76

215

168

98

190

325

24

341

235

171

143

118

121

59

190

131

96

228

304

25

337

233

166

145

119

161

59

195

109

109

214

308

26

339

227

161

144

121

128

64

195

90

115

188

293

27

366

221

157

144

120

131

98

203

85

123

179

273

28

334

212

164

143

120

164

177

200

86

138

189

267

29

348

213

168

140

---

155

161

506

89

129

191

256

30

335

213

165

138

---

136

130

943

90

120

194

258

31

320

---

158

137

---

135

---

892

---

113

202

---

TOTAL

9,958

7,741

5,665

4,637

3,601

3,943

1,553

6,067

7,237

3,090

4,668

13,173

MEAN

321

258

183

150

129

127

51.8

196

241

99.7

151

439

MAX

452

308

217

163

142

164

177

943

919

138

228

1,230

MIN

248

212

157

137

118

107

15

65

85

71

109

198

AC-FT

19,750

15,350

11,240

9,200

7,140

7,820

3,080

12,030

14,350

6,130

9,260

26,130

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2003, BY WATER YEAR (WY)
MEAN

405

257

170

140

135

166

303

496

548

315

290

391

MAX

844

442

294

223

222

367

1,107

2,542

1,763

1,170

959

944

(WY)

(1998)

(1999)

(1999)

(1999)

(1997)

(1997)

(1985)

(1984)

(1984)

(1983)

(1999)

(1961)

MIN

131

125

111

70.9

66.5

80.7

51.8

92.2

82.3

82.3

93.7

123

(WY)

(1978)

(1950)

(1943)

(1943)

(1943)

(1951)

(2003)

(2002)

(2002)

(2002)

(1956)

(1956)

SUMMARY STATISTICS
FOR 2002 CALENDAR YEAR
FOR 2003 WATER YEAR
WATER YEARS 1939 - 2003
ANNUAL TOTAL
59,713
71,333
ANNUAL MEAN
164
195
302
HIGHEST ANNUAL MEAN
688 1984
LOWEST ANNUAL MEAN
155 1951
HIGHEST DAILY MEAN
452 Oct 3
1,230 Sep 10
4,520 May 15, 1984
LOWEST DAILY MEAN
67 Apr 7
15 Apr 12
a15 Apr 12, 2003
ANNUAL SEVEN-DAY MINIMUM
70 Apr 20
23 Apr 7
23 Apr 7, 2003
MAXIMUM PEAK FLOW
1,530 Sep 11
b5,800 May 15, 1984
MAXIMUM PEAK STAGE
6.06 Sep 11
8.85 May 15, 1984
ANNUAL RUNOFF (AC-FT)
118,400
141,500
218,600
10 PERCENT EXCEEDS
290
334
598
50 PERCENT EXCEEDS
151
150
205
90 PERCENT EXCEEDS
75
78
107

e Estimated.
a Minimum daily discharge for period of record, no flow at times in 1908. Minimum daily determined since beginning of diversion through Gunnison Tunnel, 7.0 ft3/s, Jul 10-15, 17, 21, 24-28, 1910.
b From rating curve extended above 3,400 ft3/s.


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