Chesapeake Bay Period-of-Record Summary Statistics

Chesapeake Bay streamflow period-of-record summary statistics are listed in tabular form. Streamflow codes are identified as follows: A, approved data; B, computed using only approved data; e, value involves manual editing by USGS personnel; L, computed using a summation of other values; M, computed using a model; N, computed using more than one model; P, provisional data; Q, computed using provisional data.
YearMonthDateInflow CodeEstimated Inflow (cfs)POR MeanPOR MinimumPOR 25th PercentilePOR 75th PercentilePOR Maximum
202152021-05PN819001010003300062000131000217000
202142021-04PN1049001420005600097000175000390000
202132021-03PN15460014400052000103000178000299000
202122021-02PN855001030003600072000130000229000
202112021-01PN92900910001800057000114000246000
2020122020-12PN134900850001700054000106000221000
2020112020-11PN6680062000150003200077000212000
2020102020-10PN3250045000100002300052000174000
202092020-09PN322003800090001700036000201000
202082020-08PN3870034000100002000040000133000
202072020-07PN2710040000110002500046000121000
202062020-06PN6720065000180004200076000343000
202052020-05PN1482001010003300062000131000217000
202042020-04PN1259001420005600097000175000390000
202032020-03PN10310014400052000103000178000299000
202022020-02PN1176001030003600072000130000229000
202012020-01PN96100910001800057000117000246000
2019122019-12PN76800850001700054000106000221000
2019112019-11PN6830062000150003200077000212000
2019102019-10PN3260045000100002300052000174000
201992019-09PN207003800090001700036000201000
201982019-08PN3210034000100002000040000133000
201972019-07PN5380040000110002500046000121000
201962019-06PN9540065000180004200076000343000
201952019-05PN1467001010003300062000131000217000
201942019-04PN1542001420005600097000175000390000
201932019-03AN15960014400052000103000178000299000
201922019-02AN1762001030003600072000130000229000
201912019-01AN165800910001800057000117000246000
2018122018-12AN207300850001700054000106000221000
2018112018-11QeN21210062000150003200077000212000
2018102018-10QeN12980045000100002300052000174000
201892018-09QN2013003800090001700036000201000
201882018-08QN13270034000100002000040000133000
201872018-07QN10150040000110002500046000121000
201862018-06QN11070065000180004200076000343000
201852018-05QN1576001010003300062000131000217000
201842018-04QN1474001420005600097000175000390000
201832018-03QeN10470014400052000103000178000299000
201822018-02QN1565001030003600072000130000229000
201812018-01QN69900910001800057000117000246000
2017122017-12QN28600850001700054000106000221000
2017112017-11QN6010062000150003200077000212000
2017102017-10QN2430045000100002300052000174000
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201782017-08BN4000034000100002000040000133000
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201732017-03BN8630014400052000103000178000299000
201722017-02BN820001030003600072000130000229000
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195261952-06BN4800065000180004200076000343000
195251952-05BN1406001010003300062000131000217000
195241952-04BN1778001420005600097000175000390000
195231952-03BN18120014400052000103000178000299000
195221952-02BN1224001030003600072000130000229000
195211952-01BN172300910001800057000117000246000
1951121951-12BN81300850001700054000106000221000
1951111951-11BN4250062000150003200077000212000
1951101951-10BN1440045000100002300052000174000
195191951-09BN171003800090001700036000201000
195181951-08BN2360034000100002000040000133000
195171951-07BN4300040000110002500046000121000
195161951-06BN8690065000180004200076000343000
195151951-05BN669001010003300062000131000217000
195141951-04BN1784001420005600097000175000390000
195131951-03BN14450014400052000103000178000299000
195121951-02BN1745001030003600072000130000229000
195111951-01BN118400910001800057000117000246000
1950121950-12BN173800850001700054000106000221000
1950111950-11BN11100062000150003200077000212000
1950101950-10BN4610045000100002300052000174000
195091950-09BN639003800090001700036000201000
195081950-08BN2890034000100002000040000133000
195071950-07BN3500040000110002500046000121000
195061950-06BN7360065000180004200076000343000
195051950-05BN1012001010003300062000131000217000
195041950-04BN1340001420005600097000175000390000
195031950-03BN13610014400052000103000178000299000
195021950-02BN1302001030003600072000130000229000
195011950-01BN100100910001800057000117000246000
1949121949-12BN69500850001700054000106000221000
1949111949-11BN4330062000150003200077000212000
1949101949-10BN2560045000100002300052000174000
194991949-09BN316003800090001700036000201000
194981949-08BN3900034000100002000040000133000
194971949-07BN6790040000110002500046000121000
194961949-06BN5200065000180004200076000343000
194951949-05BN858001010003300062000131000217000
194941949-04BN1177001420005600097000175000390000
194931949-03BN9580014400052000103000178000299000
194921949-02BN1358001030003600072000130000229000
194911949-01BN191100910001800057000117000246000
1948121948-12BN134800850001700054000106000221000
1948111948-11BN7190062000150003200077000212000
1948101948-10BN3820045000100002300052000174000
194891948-09BN195003800090001700036000201000
194881948-08BN4810034000100002000040000133000
194871948-07BN4060040000110002500046000121000
194861948-06BN5930065000180004200076000343000
194851948-05BN1322001010003300062000131000217000
194841948-04BN1872001420005600097000175000390000
194831948-03BN17630014400052000103000178000299000
194821948-02BN966001030003600072000130000229000
194811948-01BN48700910001800057000117000246000
1947121947-12BN40400850001700054000106000221000
1947111947-11BN6120062000150003200077000212000
1947101947-10BN1980045000100002300052000174000
194791947-09BN270003800090001700036000201000
194781947-08BN3590034000100002000040000133000
194771947-07BN6210040000110002500046000121000
194761947-06BN7600065000180004200076000343000
194751947-05BN1280001010003300062000131000217000
194741947-04BN1214001420005600097000175000390000
194731947-03BN9980014400052000103000178000299000
194721947-02BN612001030003600072000130000229000
194711947-01BN101000910001800057000117000246000
1946121946-12BN28700850001700054000106000221000
1946111946-11BN3070062000150003200077000212000
1946101946-10BN3790045000100002300052000174000
194691946-09BN202003800090001700036000201000
194681946-08BN3560034000100002000040000133000
194671946-07BN4200040000110002500046000121000
194661946-06BN12290065000180004200076000343000
194651946-05BN1468001010003300062000131000217000
194641946-04BN595001420005600097000175000390000
194631946-03BN15680014400052000103000178000299000
194621946-02BN722001030003600072000130000229000
194611946-01BN119500910001800057000117000246000
1945121945-12BN107100850001700054000106000221000
1945111945-11BN9610062000150003200077000212000
1945101945-10BN6200045000100002300052000174000
194591945-09BN791003800090001700036000201000
194581945-08BN4560034000100002000040000133000
194571945-07BN4850040000110002500046000121000
194561945-06BN5940065000180004200076000343000
194551945-05BN1285001010003300062000131000217000
194541945-04BN942001420005600097000175000390000
194531945-03BN22180014400052000103000178000299000
194521945-02BN892001030003600072000130000229000
194511945-01BN69200910001800057000117000246000
1944121944-12BN59000850001700054000106000221000
1944111944-11BN2680062000150003200077000212000
1944101944-10BN3540045000100002300052000174000
194491944-09BN363003800090001700036000201000
194481944-08BN1500034000100002000040000133000
194471944-07BN2310040000110002500046000121000
194461944-06BN5010065000180004200076000343000
194451944-05BN1197001010003300062000131000217000
194441944-04BN1329001420005600097000175000390000
194431944-03BN17000014400052000103000178000299000
194421944-02BN521001030003600072000130000229000
194411944-01BN45400910001800057000117000246000
1943121943-12BN25500850001700054000106000221000
1943111943-11BN6960062000150003200077000212000
1943101943-10BN2570045000100002300052000174000
194391943-09BN133003800090001700036000201000
194381943-08BN1920034000100002000040000133000
194371943-07BN3520040000110002500046000121000
194361943-06BN7020065000180004200076000343000
194351943-05BN1484001010003300062000131000217000
194341943-04BN1352001420005600097000175000390000
194331943-03BN15810014400052000103000178000299000
194321943-02BN1333001030003600072000130000229000
194311943-01BN148600910001800057000117000246000
1942121942-12BN104300850001700054000106000221000
1942111942-11BN7790062000150003200077000212000
1942101942-10BN12280045000100002300052000174000
194291942-09BN329003800090001700036000201000
194281942-08BN7230034000100002000040000133000
194271942-07BN3770040000110002500046000121000
194261942-06BN6560065000180004200076000343000
194251942-05BN1218001010003300062000131000217000
194241942-04BN1121001420005600097000175000390000
194231942-03BN13740014400052000103000178000299000
194221942-02BN558001030003600072000130000229000
194211942-01BN40800910001800057000117000246000
1941121941-12BN43500850001700054000106000221000
1941111941-11BN1680062000150003200077000212000
1941101941-10BN960045000100002300052000174000
194191941-09BN138003800090001700036000201000
194181941-08BN1980034000100002000040000133000
194171941-07BN4080040000110002500046000121000
194161941-06BN4060065000180004200076000343000
194151941-05BN333001010003300062000131000217000
194141941-04BN1405001420005600097000175000390000
194131941-03BN8530014400052000103000178000299000
194121941-02BN497001030003600072000130000229000
194111941-01BN82400910001800057000117000246000
1940121940-12BN81800850001700054000106000221000
1940111940-11BN5950062000150003200077000212000
1940101940-10BN2540045000100002300052000174000
194091940-09BN476003800090001700036000201000
194081940-08BN5730034000100002000040000133000
194071940-07BN4130040000110002500046000121000
194061940-06BN9340065000180004200076000343000
194051940-05BN831001010003300062000131000217000
194041940-04BN3092001420005600097000175000390000
194031940-03BN10090014400052000103000178000299000
194021940-02BN653001030003600072000130000229000
194011940-01BN28500910001800057000117000246000
1939121939-12BN27200850001700054000106000221000
1939111939-11BN3310062000150003200077000212000
1939101939-10BN2060045000100002300052000174000
193991939-09BN147003800090001700036000201000
193981939-08BN3320034000100002000040000133000
193971939-07BN2970040000110002500046000121000
193961939-06BN3130065000180004200076000343000
193951939-05BN512001010003300062000131000217000
193941939-04BN1291001420005600097000175000390000
193931939-03BN15610014400052000103000178000299000
193921939-02BN1890001030003600072000130000229000
193911939-01BN52500910001800057000117000246000
1938121938-12BN83900850001700054000106000221000
1938111938-11BN3080062000150003200077000212000
1938101938-10BN2250045000100002300052000174000
193891938-09BN326003800090001700036000201000
193881938-08BN4830034000100002000040000133000
193871938-07BN4800040000110002500046000121000
193861938-06BN5010065000180004200076000343000
193851938-05BN595001010003300062000131000217000
193841938-04BN892001420005600097000175000390000
193831938-03BN11210014400052000103000178000299000
193821938-02BN1019001030003600072000130000229000
193811938-01BN79400910001800057000117000246000
1937121937-12BN79900850001700054000106000221000
1937111937-11BN10660062000150003200077000212000
1937101937-10BN11160045000100002300052000174000
193791937-09BN470003800090001700036000201000
193781937-08BN5570034000100002000040000133000
193771937-07BN3830040000110002500046000121000
193761937-06BN5020065000180004200076000343000
193751937-05BN1080001010003300062000131000217000
193741937-04BN1855001420005600097000175000390000
193731937-03BN8610014400052000103000178000299000
193721937-02BN1297001030003600072000130000229000
193711937-01BN213400910001800057000117000246000
1936121936-12BN80300850001700054000106000221000
1936111936-11BN4780062000150003200077000212000
1936101936-10BN3320045000100002300052000174000
All values are provisional and subject to revision.