11399000 LAKE ALMANOR AT PRATTVILLE, CA. LOCATION - Lat 40°12'46", long 121°09'43", in SW 1/4 NE 1/4 sec.11, T.27 N., R.7 E., Plumas County, Hydrologic Unit 18020121, Lassen National Forest, at intake tower to Butt Valley Tunnel at Prattville, 4.7 mi northwest of Lake Almanor Dam, and 5.6 mi northwest of Canyondam.
DRAINAGE AREA - 491 mi2.
PERIOD OF RECORD - July 1913 to current year. Monthly contents only for some periods, published in WSP 1315-A. Published as "near Prattville" 1937.60. Prior to October 1964, records published as usable contents.
REVISED RECORDS - WSP 1931: Drainage area.
GAGE - Nonrecording gage read once daily. Datum of gage is 10.23 ft below sea level (levels by Pacific Gas & Electric Co.). Prior to June 1, 1965, nonrecording gage at site 4.7 mi southeast at same datum.
REMARKS - Lake is formed by earthfill dam; storage began in July 1913; dam raised to gage height 4,455 ft in 1917 and 4,515 ft in 1927. Usable capacity, 1,175,000 acre-ft, between gage heights 4,422 ft, invert of outlet, and 4,495.5 ft, maximum storage limit. Dead storage, 8,948 acre-ft. Water is diverted by tunnel and penstock to Butt Valley Powerplant (station 11400600) and then is used for power development in the North Fork Feather River. Figures given, including extremes, represent total contents at 2400 hours. See schematic diagram of North Fork Feather River Basin.
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. Contents not rounded to U.S. Geological Survey standards.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,142,960 acre-ft, June 8, 1982, gage height, 4,494.00 ft; minimum, 5,230 acre-ft, Feb. 5, 1918, gage height, 4,416.1 ft.
EXTREMES FOR CURRENT YEAR - Maximum contents, 1,037,316 acre-ft, June 10, gage height, 4,490.04 ft; minimum, 662,618 acre-ft, Sept. 30, gage height, 4,474.55 ft.
|
||||||||||||||||||||||||||||||||||||||||||||||||
|
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY OBSERVATION AT 2400 HOURS
|
|||||||||||||
|
Day |
Oct |
Nov |
Dec |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
|
|
|
|||||||||||||
|
1 |
765885 |
716036 |
713986 |
761911 |
804759 |
784668 |
844167 |
918433 |
1022110 |
1022894 |
974013 |
920187 |
|
|
2 |
762378 |
714897 |
712622 |
763312 |
806427 |
784903 |
846592 |
921438 |
1025509 |
1019761 |
973502 |
917682 |
|
|
3 |
760045 |
713076 |
711258 |
763780 |
808336 |
786077 |
849021 |
925435 |
1028652 |
1017675 |
971457 |
914932 |
|
|
4 |
757949 |
711486 |
710351 |
765183 |
809769 |
787017 |
851929 |
928690 |
1030487 |
1016373 |
969414 |
913184 |
|
|
5 |
757018 |
710124 |
709217 |
766119 |
808813 |
787957 |
853381 |
931450 |
1032062 |
1015592 |
967119 |
911687 |
|
|
6 |
755856 |
710351 |
708084 |
766354 |
808097 |
789134 |
854835 |
934465 |
1033113 |
1014812 |
965082 |
912435 |
|
|
7 |
752839 |
716036 |
707404 |
767056 |
807381 |
790311 |
857262 |
939504 |
1033639 |
1013252 |
963047 |
913184 |
|
|
8 |
750986 |
718775 |
707404 |
767525 |
805474 |
791254 |
859206 |
943039 |
1034690 |
1011693 |
961523 |
913933 |
|
|
9 |
748905 |
721520 |
706726 |
768463 |
803569 |
792197 |
860665 |
946076 |
1036269 |
1010135 |
959492 |
912685 |
|
|
10 |
746596 |
723812 |
706726 |
769872 |
801430 |
793614 |
862614 |
949119 |
1037316 |
1009357 |
957464 |
910441 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
11 |
744522 |
725190 |
706273 |
770811 |
798820 |
795032 |
864321 |
951647 |
1036792 |
1008061 |
955944 |
907703 |
|
|
12 |
743141 |
725649 |
705821 |
772458 |
796451 |
795978 |
870433 |
954173 |
1036269 |
1006766 |
953921 |
905714 |
|
|
13 |
742221 |
726339 |
710351 |
775049 |
796451 |
797398 |
873867 |
956704 |
1036269 |
1005212 |
952404 |
902736 |
|
|
14 |
740383 |
726799 |
719461 |
776464 |
796924 |
802856 |
876078 |
958731 |
1035216 |
1003144 |
950385 |
900259 |
|
|
15 |
739007 |
726799 |
724960 |
777409 |
797872 |
807620 |
878047 |
960761 |
1035216 |
1001077 |
949119 |
898274 |
|
|
16 |
738090 |
724960 |
731638 |
778815 |
799768 |
809769 |
880016 |
964319 |
1034690 |
999268 |
947343 |
895299 |
|
|
17 |
736030 |
724271 |
734180 |
779750 |
799057 |
811203 |
881734 |
967119 |
1034427 |
997711 |
946330 |
892824 |
|
|
18 |
734875 |
723353 |
735801 |
780218 |
798820 |
812400 |
883700 |
969925 |
1034164 |
996156 |
944810 |
890353 |
|
|
19 |
733718 |
722666 |
737861 |
779750 |
798583 |
813597 |
885422 |
972990 |
1034164 |
994861 |
943292 |
887885 |
|
|
20 |
732562 |
722207 |
740613 |
779282 |
797161 |
815276 |
887639 |
976573 |
1034164 |
993567 |
941776 |
885422 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
21 |
731638 |
721749 |
741761 |
780218 |
796214 |
817196 |
890106 |
979907 |
1033639 |
992532 |
940765 |
882962 |
|
|
22 |
730253 |
721291 |
742911 |
782558 |
795741 |
818879 |
892082 |
983505 |
1033639 |
991240 |
940765 |
880016 |
|
|
23 |
729331 |
720604 |
743831 |
784903 |
794795 |
820805 |
894061 |
987884 |
1032588 |
990465 |
939251 |
877800 |
|
|
24 |
728179 |
719918 |
743371 |
787957 |
794322 |
822733 |
899019 |
991756 |
1031537 |
989432 |
936983 |
878539 |
|
|
25 |
726799 |
719004 |
742911 |
790076 |
792669 |
825147 |
902488 |
995120 |
1030487 |
987368 |
935220 |
877800 |
|
|
26 |
725879 |
717633 |
741991 |
792669 |
790782 |
828743 |
904969 |
999008 |
1029438 |
985307 |
933962 |
875341 |
|
|
27 |
724271 |
715808 |
744522 |
794322 |
788663 |
831863 |
907454 |
1002885 |
1027865 |
983762 |
932454 |
873376 |
|
|
28 |
722666 |
716720 |
750292 |
796688 |
786312 |
834027 |
911438 |
1006766 |
1027080 |
981705 |
929944 |
871413 |
|
|
29 |
720833 |
715353 |
753071 |
798820 |
835712 |
914432 |
1011174 |
1025770 |
979651 |
927187 |
870188 |
||
|
30 |
719232 |
714669 |
756553 |
800480 |
838605 |
916431 |
1014812 |
1024201 |
978111 |
925185 |
869943 |
||
|
31 |
718090 |
760511 |
802618 |
841747 |
1018457 |
976061 |
922686 |
||||||
|
MAX |
765885 |
726799 |
760511 |
802618 |
809769 |
841747 |
916431 |
1018457 |
1037316 |
1022894 |
974013 |
920187 |
|
|
MIN |
718090 |
710124 |
705821 |
761911 |
786312 |
784668 |
844167 |
918433 |
1022110 |
976061 |
922686 |
869943 |
|
|
a |
4477.02 |
4476.87 |
4478.86 |
4480.65 |
4479.96 |
4482.28 |
4485.32 |
4489.32 |
4489.54 |
4487.68 |
4485.57 |
4483.42 |
|
|
b |
-49904 |
-3421 |
+45842 |
+42107 |
-16306 |
+55435 |
+74684 |
+102026 |
+5744 |
-48140 |
-53375 |
-52743 |
|
|
|||||||||||||