11368000 McCLOUD RIVER ABOVE SHASTA LAKE, CA
LOCATION.-Lat 40°57'30", long 122°13'07", unsurveyed, T.36 N., R.3 W., Shasta County, Hydrologic Unit
18020004, on right bank, just upstream from Shasta Lake, 0.2 mi downstream from Big Bollibokka Creek, and 11.3 mi
east of Lamoine.
DRAINAGE AREA.-604 mi2.
PERIOD OF RECORD.-October 1945 to current year. Prior to 1950, published as "above Shasta Reservoir."
TEMPERATURE: Water years 1956-59.
REVISED RECORDS.-WSP 1445: 1953(M). WSP 1931: Drainage area. WDR CA-94-4: 1993(P).
GAGE.-Water-stage recorder. Datum of gage is 1,100.00 ft above sea level (levels by U.S. Bureau of Reclamation).
REMARKS.-Low flow completely regulated by Lake McCloud (station 11367740) 16.5 mi upstream since Nov. 3, 1965.
Diversions to Iron Canyon Reservoir (station 11363920) began Dec. 1, 1965. See schematic diagram of Pit and
McCloud River Basins.
COOPERATION.-Records were collected by Pacific Gas & Electric Co., under general supervision of the U.S.
Geological Survey, in connection with a Federal Energy Regulatory Commission project.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 51,300 ft3/s, Jan. 1, 1997, gage height, 29.00 ft,
from rating curve extended above 15,000 ft3/s on basis of slope-area measurement of peak flow; minimum
daily, 109 ft3/s, Dec. 16-20, 1971. Minimum prior to regulation by Lake McCloud, 825 ft3/s,
Jan. 3, 1950.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 4,500 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Nov. 30 2100 7,750 17.06
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 354 354 4200 418 647 3240 1010 1260 637 402 340 349
2 354 346 2340 404 615 2450 941 1090 654 397 340 348
3 354 346 3100 398 594 2220 888 1040 649 394 339 343
4 353 345 2000 391 577 1840 841 1110 631 393 338 343
5 353 346 1380 389 561 1570 853 1100 609 388 340 343
6 349 350 1080 386 1010 1380 812 1000 539 386 345 343
7 346 472 916 386 3520 1230 811 988 474 383 352 340
8 351 392 837 384 2430 1190 1260 973 451 379 352 339
9 350 365 765 383 2910 1140 1200 952 443 378 344 338
10 348 397 722 383 2200 1070 1100 894 441 376 345 340
11 348 398 689 380 1560 1170 1040 768 437 374 352 336
12 346 379 656 372 1260 960 1010 727 434 378 347 336
13 352 369 652 362 1070 928 1010 717 433 375 341 336
14 349 364 652 365 964 928 1030 704 427 376 338 335
15 345 388 613 391 879 916 1020 688 428 374 339 334
16 345 385 569 429 958 905 1020 677 427 373 336 334
17 345 527 531 726 1170 906 1040 667 427 373 335 336
18 345 423 523 2080 1470 918 1100 660 428 371 335 336
19 340 388 512 1900 1670 924 1120 655 428 368 333 336
20 336 376 502 2240 1440 936 1090 697 423 367 329 336
21 336 791 479 1840 1320 941 1040 722 421 365 327 335
22 336 806 484 1990 1360 927 1240 801 416 362 328 333
23 338 2100 479 3040 1660 949 1070 822 412 361 326 331
24 393 1330 471 1930 1820 1440 1100 821 411 358 328 332
25 371 926 463 1410 2860 2910 1190 810 410 359 327 331
26 352 867 457 1150 2280 2210 1290 799 407 357 324 331
27 346 891 449 959 1770 1720 1350 795 413 354 324 331
28 350 729 444 849 2880 1450 1240 790 409 355 325 331
29 348 728 437 777 --- 1280 1050 800 405 350 326 331
30 349 4450 430 729 --- 1180 1230 783 403 343 329 334
31 347 --- 427 696 --- 1080 --- 701 --- 341 332 ---
TOTAL 10829 21328 28259 28537 43455 42908 31996 26011 13927 11510 10416 10101
MEAN 349 711 912 921 1552 1384 1067 839 464 371 336 337
MAX 393 4450 4200 3040 3520 3240 1350 1260 654 402 352 349
MIN 336 345 427 362 561 905 811 655 403 341 324 331
AC-FT 21480 42300 56050 56600 86190 85110 63460 51590 27620 22830 20660 20040
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 1965, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 1121 1252 2080 2077 2617 2177 2467 1965 1460 1159 1059 1020
MAX 1899 2162 6513 4525 7493 3966 4599 2978 2248 1715 1489 1395
(WY) 1951 1951 1956 1953 1958 1958 1963 1958 1958 1958 1958 1958
MIN 856 870 856 903 1040 1265 1320 1085 1069 901 852 839
(WY) 1950 1950 1950 1949 1948 1964 1964 1947 1949 1950 1950 1950
SUMMARY STATISTICS WATER YEARS 1946 - 1965
ANNUAL MEAN 1699
HIGHEST ANNUAL MEAN 2703 1958
LOWEST ANNUAL MEAN 1213 1950
HIGHEST DAILY MEAN 36100 Dec 21 1955
LOWEST DAILY MEAN 825 Jan 3 1950
ANNUAL SEVEN-DAY MINIMUM 826 Oct 9 1950
INSTANTANEOUS PEAK FLOW a45200 Dec 22 1955
INSTANTANEOUS PEAK STAGE 28.20 Dec 22 1955
ANNUAL RUNOFF (AC-FT) 1231000
10 PERCENT EXCEEDS 2670
50 PERCENT EXCEEDS 1270
90 PERCENT EXCEEDS 928
a from rating curve extended above 6,400 ft3/s on basis of slope-area measurement of peak flow.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1967 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 308 588 866 1488 1500 1648 959 694 440 325 285 290
MAX 468 4068 3681 6043 5118 5825 2794 1930 1379 540 409 366
(WY) 1990 1974 1997 1970 1986 1983 1982 1983 1998 1998 1998 1998
MIN 206 227 235 222 232 248 226 232 215 200 192 200
(WY) 1992 1992 1977 1991 1977 1977 1977 1977 1977 1977 1991 1991
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1967 - 1999
ANNUAL TOTAL 533826 279277
ANNUAL MEAN 1463 765 779
HIGHEST ANNUAL MEAN 1720 1974
LOWEST ANNUAL MEAN 230 1977
HIGHEST DAILY MEAN 12900 Mar 24 4450 Nov 30 45000 Jan 1
1997
LOWEST DAILY MEAN 336 Oct 20 324 Aug 26 109 Dec 16
1971
ANNUAL SEVEN-DAY MINIMUM 339 Oct 17 326 Aug 23 113 Dec 15
1971
INSTANTANEOUS PEAK FLOW 7750 Nov 30 51300 Jan 1
1997
INSTANTANEOUS PEAK STAGE 17.06 Nov 30 29.00 Jan 1
1997
ANNUAL RUNOFF (AC-FT) 1059000 553900 564700
10 PERCENT EXCEEDS 3200 1440 1530
50 PERCENT EXCEEDS 936 444 364
90 PERCENT EXCEEDS 355 336 248
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