USGS
1995 California Hydrologic Data Report
11453900 LAKE BERRYESSA NEAR WINTERS, CA
LOCATION.--Lat 38`30'48", long 122`06'13", in SE 1/4 NW 1/4 sec.29, T.8 N., R.2 W., Napa County, Hydrologic Unit
18020117, near center of Monticello Dam on Putah Creek, 7.4 mi west of Winters.
DRAINAGE AREA.--566 mi2.
PERIOD OF RECORD.--January 1957 to current year.
REVISED RECORDS.--WSP 1735: 1958-60. WSP 1931: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is sea level (levels by U.S. Bureau of Reclamation).
REMARKS.--Reservoir is formed by concrete arch-gravity dam completed November 1956. Usable capacity,
1,592,000 acre-ft between elevations 253.25 ft, invert of outlet valves, and 440 ft crest of glory-hole
spillway. Dead storage, 10,340 acre-ft. Water is released down Putah Creek and is diverted into Putah South
Diversion Canal for irrigation of about 46,000 acres in the lower Sacramento Valley. Total diverted during
current year was 178,100 acre-ft, provided by U.S. Bureau of Reclamation. Releases for irrigation began in
May 1959. Records, including extremes, show total contents at 2400 hours. See schematic diagram of lower
Sacramento River basin.
COOPERATION.--Records provided by U.S. Bureau of Reclamation.
EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 1,733,500 acre-ft, Mar. 2, 1983, elevation, 446.67 ft; minimum
since irrigation pool first filled, 422,130 acre-ft, Dec. 1, l992, elevation, 361.73 ft.
EXTREMES FOR CURRENT YEAR.--Maximum contents, 1,492,200 acre-ft, May 17, 18, 20, 21, elevation, 434.21 ft;
minimum, 548,230 acre-ft, Nov. 4, elevation, 373.14 ft.
Capacity table (elevation, in feet, and contents, in acre-feet)
(Based on survey by U.S. Bureau of Reclamation in 1956)
360 404,550 390 765,730 420 1,236,000
370 511,760 400 911,200 430 1,414,200
380 632,360 410 1,068,100 450 1,799,900
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 567790 549650 549410 560470 1026100 1065200 1439600 1478000 1486000 1451200 1403700 1353700
2 566950 549180 549410 561070 1029800 1067500 1441200 1480800 1484300 1449700 1402100 1352100
3 566110 548700 550960 562030 1032300 1068900 1442900 1482600 1483200 1448600 1400500 1350500
4 565630 548230 554520 569470 1034600 1069800 1444500 1484100 1482600 1446900 1398600 1348900
5 565270 550130 555350 573100 1037100 1070400 1446400 1485100 1481000 1445500 1396800 1347400
6 564910 550960 555350 579530 1040500 1070900 1448100 1485800 1479500 1444200 1395000 1346200
7 564430 550720 555590 594940 1041500 1071500 1452300 1486400 1478200 1442500 1393500 1345100
8 563950 550360 555940 665590 1043900 1079000 1455700 1486400 1477000 1441000 1391700 1344000
9 563350 550720 556060 742470 1046300 1167200 1458100 1488100 1475900 1439600 1390100 1342400
10 562750 550720 556060 785250 1047300 1238000 1459200 1488600 1474400 1437500 1388300 1342400
11 562150 550720 556060 797440 1048200 1265900 1460900 1488200 1473700 1436400 1387000 1341300
12 561430 550720 556420 811430 1049700 1278700 1462300 1488200 1472800 1434800 1385700 1338600
13 560710 550600 556420 841520 1051600 1300900 1463500 1490100 1470900 1433100 1383700 1337400
14 559990 550600 557250 882810 1053200 1307600 1464800 1490500 1469800 1431400 1382100 1336100
15 559270 550600 558550 894930 1054500 1318800 1465900 1491300 1469200 1429800 1380400 1334900
16 558430 550720 559030 902160 1055700 1325800 1466400 1491800 1468700 1428100 1378800 1333800
17 557720 550720 559390 906830 1056500 1331500 1467500 1492200 1468100 1426700 1376600 1332700
18 557010 550360 559630 910000 1057600 1335400 1468700 1492200 1467500 1424800 1375000 1331100
19 556300 549890 559630 912570 1058400 1339200 1468800 1492000 1466600 1423700 1373400 1330100
20 555590 549410 561430 916370 1059200 1350300 1469400 1492200 1465900 1422100 1371800 1329500
21 554990 549180 561430 920010 1060000 1357100 1469800 1492200 1465100 1420400 1370100 1327900
22 554400 549060 561430 932810 1060800 1384800 1470000 1492000 1464000 1418800 1369000 1326800
23 554040 548940 559630 950620 1061300 1401400 1470100 1491800 1463100 1417500 1366700 1325800
24 553570 549180 559630 960980 1062000 1410300 1470300 1491400 1461400 1415800 1365100 1324700
25 552970 549530 559750 967810 1062800 1416700 1470500 1491100 1459600 1414200 1364300 1323800
26 552500 549650 559870 977940 1063300 1421900 1470300 1490300 1458600 1413100 1362400 1322700
27 552030 549650 559870 990310 1063800 1425900 1470000 1489900 1457500 1411400 1360700 1321800
28 551430 549650 559870 997710 1064700 1429200 1470300 1489400 1455800 1409800 1359600 1321000
29 551080 549530 560110 1006900 --- 1432000 1470500 1488800 1454700 1408100 1358000 1319900
30 550600 549530 560230 1013800 --- 1434800 1472900 1488100 1453100 1406500 1356400 1319000
31 550130 --- 560350 1021300 --- 1437300 --- 1487100 --- 1405400 1354800 ---
MAX 567790 550960 561430 1021300 1064700 1437300 1472900 1492200 1486000 1451200 1403700 1353700
MIN 550130 548230 549410 560470 1026100 1065200 1439600 1478000 1453100 1405400 1354800 1319000
a 373.30 373.25 374.16 407.09 409.79 431.26 433.18 433.94 432.11 429.52 426.73 424.73
b -18260 -600 +10820 +460950 +43400 +372600 +35600 +14200 -34000 -47700 -50600 -35800
c 3351 1037 625 639 1379 2489 4357 6041 9232 9750 9930 7110
CAL YR 1994 b -199260
WTR YR 1995 b +750610
a Elevation, in feet, at end of month.
b Change in contents, in acre-feet.
c Evaporation, in acre-feet, provided by U.S. Bureau of Reclamation; not reviewed by U.S. Geological Survey.
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