11367800 McCLOUD RIVER AT AH-DI-NA, NEAR McCLOUD, CA

LOCATION.-Lat 41°06'39", long 122°05'42", in NE 1/4 SW 1/4 sec.33, T.38 N., R.2 W., Shasta County, Hydrologic Unit 18020004, Shasta National Forest, on 
right bank at Ah-Di-Na, 1.8 mi downstream from Squirrel Creek, 3.9 mi downstream from McCloud Dam, and 9.6 mi south of McCloud. 
DRAINAGE AREA.-427 mi2. 
PERIOD OF RECORD.-October 1964 to current year.
REVISED RECORDS.-WDR CA-98-4: 1997 (m). 
GAGE.-Water-stage recorder. Elevation of gage is 2,160 ft above sea level, from topographic map. 
REMARKS.-Low flow completely regulated by Lake McCloud (station 11367740) 3.9 mi upstream since November 1965. Diversion to Iron Canyon Reservoir (station 
11363920) through McCloud-Iron Canyon diversion tunnel (station 11367720) started Dec. 1, 1965. This station records fishwater release. The minimum release 
requirements range from 160 to  210 ft3/s per schedule outlined in Federal Energy Regulatory Commission License 2106. 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.-Prior to completion of McCloud Dam in 1965, maximum discharge, 9,660 ft3/s, Dec. 22, 1964, gage height, 9.43 ft, from 
rating curve extended above 2,500 ft3/s; minimum daily, 86 ft3/s, Oct. 1-26, 1964. Since completion of McCloud Dam, maximum discharge, 
31,700 ft3/s, Jan. 1, 1997, gage height, 14.77 ft, from rating curve extended above 8,000 ft3/s on basis of slope-area measurement of peak 
flow; minimum daily, 41 ft3/s, Dec. 18-20, 1971 (caused by valve malfunction at McCloud Dam). 
EXTREMES OUTSIDE PERIOD OF RECORD.-Flood of Dec. 21, 1955, reached a stage of 12.5 ft, discharge, 17,800 ft3/s, from rating curve extended above 2,500 
ft3/s. 
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 3,000 ft3/s, or maximum: 
  			Discharge	Gage height			Discharge	Gage height
  	Date	Time	(ft3/s)	(ft)	Date	Time	(ft3/s)	(ft)
  	Jan. 27	1230	4,010	6.23	Mar. 23	2245	6,450	7.64
  	Feb. 3	1330	4,630	6.63
REVISIONS.-The mean daily discharge for water year 1997 has been revised, Oct. 1, 2, 1996, discharge 220 ft3/s.

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
  1      e233      225      234      173      872      213      669     1020     1000      325      226      225
  2      e233      225      234      210      952      224      636     1180     1020      324      225      230
  3      e233      225      237      445     2650      243      636     1310     1140      322      225      229
  4      e233      225      237      460     2300      235      603     1040      946      319      227      229
  5      e233      225      239      299     1650      224      358     1030      916      317      226      228
 
  6      e233      227      238      238     1870      214      370     1030      909      285      225      228
  7      e233      226      292      204     2460      204      423     1020      901      245      229      228
  8      e239      225      283      186     2100      195      438     1150      889      224      228      228
  9      e242      225      248      180     1370      190      441     1430      873      228      227      229
 10       235      225      239      193      822      191      506     1250      917      244      227      228
 
 11       232      225      239      278      663      193      693      986     1400      247      226      226
 12       230      225      239      477      606      203      564      816     1410      250      226      226
 13       230      228      239      475      761      269      506      717     1380      266      226      227
 14       230      232      243      441      663      297      486      719      912      259      229      227
 15       227      242      239      472      641      307      308      718      904      234      228      226
 
 16       225      299      195      444      592      361     e248      773      893      229      228      230
 17       225      261      190      676      435      369     e248      825      733      227      228      229
 18       225      240      177      909      300      336     e364      813      680      224      228      228
 19       225      276      177      865      338      308     e396      720      676      226      228      228
 20       225      239      179      672      326      297     e400      612      669      227      228      228
 
 21       225      232      176      565      316      342     e413      607      661      226      227      227
 22       227      228      174      462      290     1140     e434      600      568      225      225      226
 23       228      260      174      321      278     3690     e522      592      522      231      225      227
 24       228      329      174      276      271     6580      803      597      520      228      225      228
 25       228      303      176      285      256     3210      831      946      514      227      225      228
 
 26       228      254      175      435      240     2450      806     1260      509      226      226      228
 27       228      239      176     1790      227     1780      743      754      444      225      226      228
 28       228      236      175      548      217     1190      737     1230      235      227      225      228
 29       227      237      175     1340      ---     1090      810     1410      375      227      225      227
 30       225      229      175     1390      ---      777     1010     1490      360      226      225      226
 31       226      ---      174      967      ---      753      ---     1320      ---      226      225      ---
 
TOTAL    7119     7267     6522    16676    24466    28075    16402    29965    23876     7716     7019     6830
MEAN      230      242      210      538      874      906      547      967      796      249      226      228
MAX       242      329      292     1790     2650     6580     1010     1490     1410      325      229      230
MIN       225      225      174      173      217      190      248      592      235      224      225      225
AC-FT   14120    14410    12940    33080    48530    55690    32530    59440    47360    15300    13920    13550
   e  Estimated.


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1965 - 1998, BY WATER YEAR (WY)                                 
 
          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
MEAN      251      285      317      472      418      493      361      354      265      226      223      234
MAX       919     1140     1863     2211     1770     2107     2102     1498     1173     1035      992      954
(WY)     1966     1974     1965     1970     1986     1983     1965     1965     1965     1965     1965     1965
MIN       180      182     93.2     93.4      119      167      166      162      160      159      155      182
(WY)     1978     1978     1972     1972     1972     1977     1968     1977     1977     1977     1977     1977
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1965 - 1998
 
ANNUAL TOTAL                      133051                     181933                                             
ANNUAL MEAN                          365                        498                        325                  
HIGHEST ANNUAL MEAN                                                                       1326              1965
LOWEST ANNUAL MEAN                                                                         168              1977
  HIGHEST DAILY MEAN                 25200     Jan  1            6580     Mar 24           25200       Jan  1 1997
  LOWEST DAILY MEAN                    166     Feb 22             173     Jan  1              41       Dec 18 1971
  ANNUAL SEVEN-DAY MINIMUM             168     Feb 21             175     Dec 26              42       Dec 15 1971
  INSTANTANEOUS PEAK FLOW                                        6450     Mar 23           31700       Jan  1 1997
  INSTANTANEOUS PEAK STAGE                                          7.64  Mar 23              14.77    Jan  1 1997
ANNUAL RUNOFF (AC-FT)             263900                     360900                     235300                  
10 PERCENT EXCEEDS                   253                       1020                        524                  
50 PERCENT EXCEEDS                   224                        242                        207                  
90 PERCENT EXCEEDS                   176                        225                        168