11372000 CLEAR CREEK NEAR IGO, CA
LOCATION.--Lat 40°30'48", long 122°31'23", unsurveyed, Shasta County, Hydrologic Unit 18020112, on left bank at
old highway bridge on Redding-Igo Road 1.0 mi northeast of Igo, 7.0 mi downstream from Whiskeytown Dam, 8.3 mi
southwest of Redding, and 10.4 mi upstream from mouth.
DRAINAGE AREA.--228 mi2.
PERIOD OF RECORD.--October 1940 to current year.
CHEMICAL DATA: Water years 1958-79.
WATER TEMPERATURE: Water years 1965-79.
REVISED RECORDS.--WSP 1345: Drainage area. WSP 1395: 1941(M).
GAGE.--Water-stage recorder. Datum of gage is 672.99 ft above sea level.
REMARKS.--Records good. Low flow completely regulated by Whiskeytown Lake (station 11371700) since May 1963.
Transbasin diversion from Trinity River through Judge Francis Carr Powerplant (station 11525430) to
Whiskeytown Lake began in April 1963. Diversions from Whiskeytown Lake to Spring Creek Powerplant (station
11371600) began in December 1963. See schematic diagrams of upper Sacramento River and Pit and McCloud River
basins.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 24,500 ft3/s, Dec. 21, 1955, gage height, 13.75 ft; minimum
daily, 9.0 ft3/s, Sept. 4-7, 1950. Since completion of Whiskeytown Dam in 1963, maximum discharge,
19,200 ft3/s, Mar. 3, 1983, gage height, 12.73 ft, from rating curve extended above 12,000 ft3/s on basis of
slope-area measurement of peak flow; minimum daily, 30 ft3/s, Oct. 10, 11, 1977.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 85 147 158 196 269 570 220 105 80 82 54 52
2 99 147 157 186 248 446 206 104 77 82 55 52
3 100 146 157 181 239 393 199 100 76 74 55 52
4 100 146 163 178 505 434 194 75 78 62 55 52
5 104 146 160 174 763 422 190 74 74 62 55 54
6 144 147 159 171 423 358 190 73 71 60 55 54
7 144 147 158 170 339 323 188 72 70 59 55 54
8 144 147 156 168 297 300 186 71 69 58 54 54
9 144 146 156 177 271 284 186 71 68 58 54 54
10 144 146 163 173 251 273 184 71 68 57 54 54
11 145 146 329 170 236 327 178 70 67 57 52 52
12 145 146 1410 168 225 297 179 69 66 57 53 53
13 141 146 288 167 215 276 179 68 65 57 52 56
14 146 143 267 165 209 260 178 69 65 57 53 57
15 146 142 753 190 205 248 180 72 64 58 53 60
16 141 154 266 514 232 240 200 261 64 56 53 58
17 144 154 212 303 423 232 186 370 65 56 53 56
18 145 154 194 330 545 225 182 240 66 59 53 55
19 144 154 184 377 684 220 183 145 63 57 52 53
20 145 154 178 528 554 215 183 119 62 56 53 53
21 145 154 174 463 541 211 183 144 64 55 53 52
22 142 154 175 303 411 207 181 138 63 55 53 52
23 144 154 173 274 352 204 179 118 65 55 52 52
24 146 154 170 339 320 201 190 108 62 56 52 52
25 148 154 167 315 289 200 182 100 62 55 52 54
26 148 154 166 273 268 197 178 97 63 55 52 54
27 148 153 166 504 257 199 177 100 66 55 53 54
28 148 154 166 403 374 189 171 91 68 54 53 54
29 147 154 212 315 977 195 146 88 84 54 53 54
30 147 155 259 309 --- 193 122 85 83 55 53 54
31 148 --- 215 293 --- 193 --- 82 --- 55 56 ---
TOTAL 4261 4498 7711 8477 10922 8532 5480 3450 2058 1828 1655 1617
MEAN 137 150 249 273 377 275 183 111 68.6 59.0 53.4 53.9
MAX 148 155 1410 528 977 570 220 370 84 82 56 60
MIN 85 142 156 165 205 189 122 68 62 54 52 52
AC-FT 8450 8920 15290 16810 21660 16920 10870 6840 4080 3630 3280 3210
11372000 CLEAR CREEK NEAR IGO, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 1962, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 76.7 150 597 807 1226 834 676 347 161 63.4 35.1 32.8
MAX 373 427 2336 2513 5753 2595 2431 773 289 126 64.6 89.7
(WY) 1951 1951 1956 1941 1958 1941 1941 1957 1953 1941 1941 1957
MIN 25.8 39.0 47.0 65.5 142 168 172 87.6 66.5 24.3 14.3 13.4
(WY) 1950 1960 1950 1947 1948 1955 1944 1947 1950 1950 1950 1944
SUMMARY STATISTICS WATER YEARS 1941 - 1962
ANNUAL MEAN 413
HIGHEST ANNUAL MEAN 1092 1941
LOWEST ANNUAL MEAN 128 1944
HIGHEST DAILY MEAN 15100 Mar 1 1941
LOWEST DAILY MEAN 9.0 Sep 4 1950
ANNUAL SEVEN-DAY MINIMUM 9.5 Sep 1 1950
INSTANTANEOUS PEAK FLOW 24500 Dec 21 1955
INSTANTANEOUS PEAK STAGE 13.75 Dec 21 1955
ANNUAL RUNOFF (AC-FT) 299000
10 PERCENT EXCEEDS 929
50 PERCENT EXCEEDS 133
90 PERCENT EXCEEDS 27
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1965 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 65.7 138 192 276 262 339 152 91.3 66.7 56.6 52.1 51.9
MAX 317 299 625 1358 1509 3437 668 419 249 117 73.3 71.6
(WY) 1993 1974 1965 1970 1983 1983 1974 1982 1993 1982 1995 1995
MIN 38.8 70.7 94.2 54.3 49.7 51.3 50.7 48.6 42.9 39.2 37.9 37.9
(WY) 1978 1969 1977 1977 1977 1977 1977 1966 1966 1966 1966 1977
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1965 - 1996
ANNUAL TOTAL 101057 60489
ANNUAL MEAN 277 165 146
HIGHEST ANNUAL MEAN 570 1983
LOWEST ANNUAL MEAN 57.9 1977
HIGHEST DAILY MEAN 4850 Jan 10 1410 Dec 12 15000 Mar 3 1983
LOWEST DAILY MEAN 66 Sep 25 52 Aug 11 30 Oct 10 1977
ANNUAL SEVEN-DAY MINIMUM 70 Sep 22 52 Aug 19 31 Oct 5 1977
INSTANTANEOUS PEAK FLOW 5480 Dec 12 19200 Mar 3 1983
INSTANTANEOUS PEAK STAGE 8.55 Dec 12 12.73 Mar 3 1983
ANNUAL RUNOFF (AC-FT) 200400 120000 105800
10 PERCENT EXCEEDS 458 311 221
50 PERCENT EXCEEDS 142 146 70
90 PERCENT EXCEEDS 73 54 49
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